If the water level falls too low during operation of a steam heating boiler the operator should

If the water level falls too low during operation of a steam heating boiler the operator should

a) tell his or her supervisor
b) add more water immediately
c) operate the safety valve
d) shut the boiler down
e) lower the flame and add water to bring it up to a safe level





Answer: D

The piping and heating units of a steam heating system must be so arranged that

The piping and heating units of a steam heating system must be so arranged that

a) the condensate can flow freely to the heating units
b) the air can be kept at the top of the heating units
c) steam can flow freely to all heating units
d) all of the above
e) none of the above





Answer: C

The two pipe gravity return steam heating system, now obsolete, had the disadvantage that during startup, some steam could pass through a radiator without condensing and could enter other radiators via the return main, thus trapping:

The two pipe gravity return steam heating system, now obsolete, had the disadvantage that during startup, some steam could pass through a radiator without condensing and could enter other radiators via the return main, thus trapping:

a. Water in the center
b. Steam in the center
c. Condensate in the center
d. Debris in the center
e. Air in the center





Answer: E

The ______________ system overcomes the difficulty of returning condensate back to the boiler due to inefficient static head.

The ______________ system overcomes the difficulty of returning condensate back to the boiler due to inefficient static head.

a. One pipe, gravity return system
b. Two pipe, gravity return system
c. One pipe, steam trap system
d. Two pipe, return trap system
e. Two pipe, steam riser system






Answer: D

Slow or insufficient heat in one or more rooms in a steam, heated building can be caused by a faulty:

Slow or insufficient heat in one or more rooms in a steam, heated building can be caused by a faulty:

a. Steam trap
b. Condensate tank float switch
c. Heater
d. Return trap
e. Boiler limit control





Answer: A

In the two, pipe variable vacuum steam heating system, the steam temperature can be varied from:

In the two, pipe variable vacuum steam heating system, the steam temperature can be varied from:

a. 200°C to as low as 100°C
b. 150°C to as low as 100°C
c. 150°C to as low as 55°C
d. 105°C to as low as 55°C
e. 105°C to as low as 45°C






Answer: D

Finned convectors should be kept free of:

Finned convectors should be kept free of:

a. Air
b. Steam
c. Corrosion
d. Dust
e. Scale





Answer: D

When starting up a steam heating boiler, it should be filled to:

When starting up a steam heating boiler, it should be filled to:

a. The maximum level
b. 3/4 of the gauge glass
c. 1/2 of the gauge glass
d. 1/4 of the gauge glass
e. The bottom of the gauge glass





Answer: C

In a gravity return system, the boiler should be placed:

In a gravity return system, the boiler should be placed:

a. Well above the highest radiator
b. Well below the lowest radiator
c. On an elevated platform
d. At the same level as the radiators
e. In a central location





Answer: B

After a steam heating system has been operating for some time, you notice that some parts of the heating system are still cold. Which one of the following could be the cause of this?

After a steam heating system has been operating for some time, you notice that some parts of the heating system are still cold. Which one of the following could be the cause of this?

a. Air is trapped in the affected sections
b. Boiler water pressure too low
c. Boiler water temperature too low
d. Steam does not contain enough heat
e. Condensate temperature too low




Answer: A

When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called:

When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called:

a. Flooded return
b. Dry return
c. Wet return
d. Reverse return
e. Direct return






Answer: C

The piping and heating units of a steam heating system must be so arranged that the:

The piping and heating units of a steam heating system must be so arranged that the:

a. Condensate can be circulated back to the heating units
b. Steam can flow freely from the heating units and be returned to the boiler
c. Air can be expelled from the heating units and piping
d. Air can be kept on top of the heating units
e. Condensate can flow freely to the heating units





Answer: C

When a single main is used to carry both the steam supply from the boiler to the radiators and the steam condensate from the radiators back to the boiler, the system is called a one pipe:

When a single main is used to carry both the steam supply from the boiler to the radiators and the steam condensate from the radiators back to the boiler, the system is called a one pipe:

a. Condensate return system
b. Gravity return system
c. Return trap system
d. Vacuum pump system
e. Variable vacuum system




Answer: B

In all systems, the horizontal steam supply pipes between boiler and heating units are called the:

In all systems, the horizontal steam supply pipes between boiler and heating units are called the:

a. Mains
b. Risers
c. Banks
d. Branches
e. Downcomers





Answer: A

All supply and drain lines of a steam heating system must be pitched to:

All supply and drain lines of a steam heating system must be pitched to:

a. Allow for drainage of condensate
b. Allow collection of air at the highest points
c. Prevent corrosion
d. Allow for thermal expansion
e. Allow steam to rise to the system high points.





Answer: A

In the case of radiators and convectors, the main sources of trouble are the:

In the case of radiators and convectors, the main sources of trouble are the:

a. Air vents
b. Fins
c. Push nipples
d. Connecting rods
e. Valves and traps





Answer: E

Slow or insufficient heat throughout a building heated by steam can be caused by:

Slow or insufficient heat throughout a building heated by steam can be caused by:

a. Too high a firing rate
b. Too low a firing rate
c. Air leaks
d. Condensate pump cavitation
e. A defective steam trap




Answer: B

Which of the following would you NOT find in a steam heating system?

Which of the following would you NOT find in a steam heating system?

a. Cushion tanks
b. Convectors
c. Return traps
d. Condensate tanks
e. Air vents





Answer: A

The Hartford Loop prevents the water in the boiler from:

The Hartford Loop prevents the water in the boiler from:

a. Exceeding the maximum temperature
b. Exceeding the highest safe level
c. Dropping below a safe level
d. Entering the equalizer piping
e. Flowing out through the steam main





Answer: C

A pressure balancing arrangement that prevents the boiler pressure from forcing boiler water into the return lines is called a:

A pressure balancing arrangement that prevents the boiler pressure from forcing boiler water into the return lines is called a:

a. Relief valve
b. Check valve
c. Pipe siphon
d. Back-flow preventer
e. Hartford loop





Answer: E

The vacuum pump performs the following function:

The vacuum pump performs the following function:

a) supplies water to the condensate receiver
b) supplies steam to the boiler
c) returns the condensate (water) back to the boiler
d) returns the condensate water to the condensate receiver
e) none of the above






Answer: C

Air can be removed from steam heating systems by

Air can be removed from steam heating systems by

a) air vents
b) a steam trap
c) an air separator
d) an air header
e) a dip tube





Answer: A

Convectors use ________ to increase heat transfer.

Convectors use ________ to increase heat transfer.

a) metal fins
b) radiators
c) blowers
d) copper tubes
e) brass tubes

Answer: A

The difference between a convector and a radiator is:

The difference between a convector and a radiator is:

a. The convector uses fans
b. The radiator's fins are much larger
c. The radiator is controlled by a thermostat
d. That one is made of cast iron and the other of steel or copper
e. The radiator is a compact design.






Answer: D

One of the main considerations in the construction of radiators suitable for steam heating systems is:

One of the main considerations in the construction of radiators suitable for steam heating systems is:

a. Large heating surface area
b. Ruggedness
c. Attractiveness
d. Modern in appearance
e. Light weight





Answer: A

Modern radiators are usually made of:

Modern radiators are usually made of:

a. Steel
b. Cast iron
c. Stainless steel
d. Copper
e. Brass





Answer: A

A radiator valve is used to control the amount of:

A radiator valve is used to control the amount of:

a. Air leaving the radiator
b. Condensate leaving the radiator
c. Steam leaving the radiator
d. Air entering the radiator
e. Steam entering the radiator







Answer: E

Radiators can be classified as:

Radiators can be classified as:

a. Floor, window or ceiling
b. Window, duct or floor
c. Wall-hung, floor, and window
d. Legless, ductless and floor
e. Cast iron, steel and copper







Answer: C

In newer steam heating systems, the condensate discharged by the steam traps, convectors, or other heating equipment, drains by gravity through the return piping to:

In newer steam heating systems, the condensate discharged by the steam traps, convectors, or other heating equipment, drains by gravity through the return piping to:

a. The boiler
b. A condensate tank
c. The condensate scrubber
d. The deaerator
e. The vacuum pump






Answer: B

Another name for a unit ventilator is:

Another name for a unit ventilator is:

a. Radiator
b. Exhauster
c. Convector
d. Register
e. Univent

Answer: E

The radiator trap is a device that allows:

The radiator trap is a device that allows:

a. Debris to collect
b. Steam to collect
c. Water and steam to collect
d. Steam to be discharged from the radiator, but prevents water from discharging
e. Water to be discharged from the radiator, but prevents steam from discharging





Answer: E

The level in the condensate receiver may be automatically controlled by a:

The level in the condensate receiver may be automatically controlled by a:

a. Float switch
b. Pressure reducing valve
c. Gate valve
d. Drain valve
e. Sight glass






Answer: A

Older radiators were usually made of:

Older radiators were usually made of:

a. Steel
b. Cast iron
c. Stainless steel
d. Copper
e. Brass






Answer: B

Unit heaters differ from convectors in that they use _____ to increase heat transfer.

Unit heaters differ from convectors in that they use _____ to increase heat transfer.

a. Metal fins
b. Natural circulation
c. Blowers
d. Copper tubes
e. Brass tubes






Answer: C

_____ are often used to aid the return of condensate through the return piping of large complexes.

_____ are often used to aid the return of condensate through the return piping of large complexes.

a. Boiler feed pumps
b. Vacuum injectors
c. Pressure controls
d. Vacuum pumps
e. Vacuum breakers






Answer: D

When air is forced through a heating unit that contains both the fan and coil, the unit is called:

When air is forced through a heating unit that contains both the fan and coil, the unit is called:

a. A unit heater
b. An injector
c. An induction unit
d. A unit ventilator
e. A convector






Answer: A

Older radiators were usually made of:

Older radiators were usually made of:

a. Steel
b. Cast iron
c. Stainless steel
d. Copper
e. Brass





Answer: B

Unit ventilators :

Unit ventilators :

a. do not filter the air
b. do not provide fresh air
c. do not use fans to circulate air
d. mix outside and inside air.
e. do not contain heating coils






Answer: D

In fin coil type heaters, individual room temperature is controlled by

In fin coil type heaters, individual room temperature is controlled by

a. Switches
b. Automatic valves
c. Dampers
d. Air relays
e. Supply ducts





Answer: C

The packless radiator valve has a bronze diaphragm that completely seals off the valve body, to prevent:

The packless radiator valve has a bronze diaphragm that completely seals off the valve body, to prevent:

a. Air from entering the radiator
b. Condensate accumulation in the valve body
c. Air leaking out around the valve stem
d. Steam leaking out around the valve stem
e. Differential pressure from changing the valve setting






Answer: D

An air vent is partially filled with volatile liquid so that:

An air vent is partially filled with volatile liquid so that:

a. When hot steam surrounds cylinder, it causes the needle valve to open.
b. When relatively cool air surrounds the cylinder, it causes the needle valve to open
c. When relatively cool air surrounds the cylinder, it causes the needle valve to close
d. Then operating mechanism will be protected from live steam
e. The air will flow in one direction only





Answer: B

Unit ventilators are:

Unit ventilators are:

a. Ceiling suspended unit heaters
b. Baseboard type heaters
c. Cabinet type heaters
d. Ceiling mounted unit heaters
e. Floor radiators





Answer: C

Hand operated pet cocks for expelling air from heating systems have been superseded by:

Hand operated pet cocks for expelling air from heating systems have been superseded by:

a. Steam traps
b. Diverters
c. Automatic air vents
d. Check valves
e. Pipe siphons






Answer: C

Large areas, such as warehouses, are usually heated by:

Large areas, such as warehouses, are usually heated by:

a. Unit heaters
b. Radiators
c. Convectors
d. Open heaters
e. Space heaters





Answer: A

The minimum temperature at which a hot water boiler should be operated to prevent flue gas condensation is ___C.

The minimum temperature at which a hot water boiler should be operated to prevent flue gas condensation is ___C.

a. 65
b. 77
c. 95
d. 88




Answer: B

An excessive rise in stack temperature can be caused by:

An excessive rise in stack temperature can be caused by:

a. Heavy scale build up
b. Too much cold air in the furnace
c. High solid content in the fuel
d. Over pressurization

Answer: A

Smoking conditions during the operation of a boiler can be caused by

Smoking conditions during the operation of a boiler can be caused by

a) improper air/fuel ratio
b) steam demands too great
c) low water conditions
d) too much combustion air
e) not enough fuel






Answer: A

It is recommended that the differential between the safety relief valve set pressure and the operating pressure of a hot water boiler be kept to a minimum of 69 kPa (10 psi) or __________ % of the relief valve setting.

It is recommended that the differential between the safety relief valve set pressure and the operating pressure of a hot water boiler be kept to a minimum of 69 kPa (10 psi) or __________ % of the relief valve setting.

a) 10
b) 15
c) 20
d) 25
e) 30






Answer: D

Thermal shock to boilers can be reduced by

Thermal shock to boilers can be reduced by

a) warming up boilers slowly
b) keeping the boiler free of scale build-up
c) covering the tube sheets with refractory
d) not allowing full flow of cold water into a warm hot water boiler
e) all of the above





Answer: E

The maximum pressure of a low pressure steam heating boiler is

The maximum pressure of a low pressure steam heating boiler is

a) 70 kPa
b) 103 kPa
c) 113 kPa
d) 207 kPa
e) 1104 kPa




Answer: B

There are two conditions that may occur during the warm up period which may seem to be abnormal to the operator but will disappear after the boiler heats up. These conditions are

There are two conditions that may occur during the warm up period which may seem to be abnormal to the operator but will disappear after the boiler heats up. These conditions are

a) uneven expansion and thermal shock
b) fluctuation of water and steam pressures
c) slight smoking and condensation
d) high stack and hot water/steam temperature
e) low stack and hot water/steam temperature







Answer: C

The discharge pressure of steam heating pressure relief valves should never exceed

The discharge pressure of steam heating pressure relief valves should never exceed

a) 14.7 kPa
b) 121 kPa
c) 93 kPa
d) 103 kPa
e) 153 kPa





Answer: D

The pressure relief valve on a hot water heating boiler should be set

The pressure relief valve on a hot water heating boiler should be set

a) 25% lower than operating pressure
b) 10% lower than operating pressure
c) 25% above operating pressure
d) 20% lower than operating pressure
e) at the operating pressure






Answer: C

In hot water boiler operation the maximum operating temperature should never exceed

In hot water boiler operation the maximum operating temperature should never exceed

a) 77 degrees C
b) 87 degrees C
c) 100 degrees C
d) 121 degrees C
e) 131 degrees C






Answer: D

If the low-water fuel cutoff and/or the high limit control are equipped with a trip-out device on a boiler, it is recommended as part of the startup preparation to

If the low-water fuel cutoff and/or the high limit control are equipped with a trip-out device on a boiler, it is recommended as part of the startup preparation to

a) dismantle the device and check for lose wires
b) push the reset button to assure that the switches are closed
c) check the low-water fuel cutoff and make sure all the mercury switches are working properly
d) check that the high limit switches are set high enough
e) dismantle the high limit switches and overhaul if necessary

Answer: B

When preparing a boiler for startup and the boiler is equipped with a modulating combustion control, it is best to

When preparing a boiler for startup and the boiler is equipped with a modulating combustion control, it is best to

a) set the manual-auto switch to "auto"
b) set the manual-auto switch to "auto" and set the flame control switch in the lowest position
c) set the manual-auto switch to "auto" and set the flame control switch in the highest position
d) set the manual-auto switch to "manual" and set the flame control switch in the lowest position
e) set the manual-auto switch to "manual" and set the flame control switch in the highest position

Answer: D

How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber?

How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber?

a. Daily
b. Monthly
c. Semi-annually
d. Annually
e. Bi-weekly






Answer: A

Rust in the gauge glass is an indication that:

Rust in the gauge glass is an indication that:

a. The boiler should to be blown down
b. Raw water is leaking into the boiler
c. The copper and brass seats of the valves are deteriorating
d. Corrosion is occurring in the system
e. It is time to add boiler chemicals





Answer: D

The most important rule in safe operation of steam boilers is to:

The most important rule in safe operation of steam boilers is to:

a. Watch the steam pressure
b. Not overheat the boiler
c. Ensure an adequate air supply
d. Ensure a fuel supply
e. Keep the correct water level






Answer: E

A gradual increase in stack temperature is an indication of:

A gradual increase in stack temperature is an indication of:

a. Correct burner operation
b. Poor operator skill
c. A defective stack thermometer
d. Boiler corrosion
e. Unclean heating surfaces





Answer: E

Slight smoking during the start-up of a cold oil-fired boiler is caused by:

Slight smoking during the start-up of a cold oil-fired boiler is caused by:

a. Dislodging soot from the gas passes
b. Having the initial fire too hot
c. Over purging of the furnace
d. A cold furnace
e. Under purging of the furnace






Answer: D

The most efficient way to keep oxygen out of the boiler water system is to:

The most efficient way to keep oxygen out of the boiler water system is to:

a. Add sufficient oxygen scavenger
b. Keep make-up water to a minimum
c. Operate the deaerator at a higher pressure
d. Increase boiler blowoff
e. Maintain a higher pH in the boiler water





Answer: B

Thermal shock to boilers can be reduced by:

Thermal shock to boilers can be reduced by:

a. Warming up boilers quickly
b. Allowing the boiler to develop a thin, insulating coating of scale
c. Slowly draining hot boilers
d. Preventing the full flow of cold water into a warm hot water boiler
e. Starting cold boilers on "automatic"





Answer: D

If your low pressure steam boiler was in service and you found that there was no water level showing in the gauge glass, your first action would be to:

If your low pressure steam boiler was in service and you found that there was no water level showing in the gauge glass, your first action would be to: 

a. Lift the safety valve try lever
b. Cut off the fuel and air to the furnace
c. Start the standby feed pump
d. Send for the Boiler Inspector
e. Call a reliable plumber





Answer: B

During the warm up period of a heating boiler, the main burner goes out. The operator should:

During the warm up period of a heating boiler, the main burner goes out. The operator should:

a. Shut down the boiler immediately purge the boiler and restart it
b. Shut down the boiler, close the fuel valves and determine the cause of the problem
c. Try to re-light the burner immediately
d. Check the altitude gage to ensure there is enough water in the system
e. Clean the burner, purge the boiler and restart it




Answer: B

It is vitally important to slowly heat up a cold boiler to prevent:

It is vitally important to slowly heat up a cold boiler to prevent:

a. Smoky flue gas
b. Uneven expansion
c. Even expansion.
d. Low efficiency
e. Cavitation in the boiler feedwater pump




Answer: B

It is very important that boilers should be:

It is very important that boilers should be:

a. Warmed up quickly to prevent condensation
b. Warmed up quickly to prevent scale build-up
c. Warmed up at a rate of one degree every five minutes
d. Warmed up slowly to prevent thermal shock
e. Lit only when cool





Answer: D

Before starting up a new boiler or one that has been out of service the following must be ensured:

Before starting up a new boiler or one that has been out of service the following must be ensured:

a. The manufacturer's recommendations are read
b. The boiler has a valid inspection certificate
c. The fuel is shut off
d. The boiler control is in the off position
e. The boiler is cold






Answer: B

While warming up an additional hot water heating boiler in preparation to put into service with other boilers, which of the following is true?

While warming up an additional hot water heating boiler in preparation to put into service with other boilers, which of the following is true?

a. Stop valves in the supply and return lines are both closed
b. Supply valve is open slightly and the return line is closed
c. Supply and return lines are open
d. Supply and return line valves are both open slightly
e. Boiler must be isolated from the expansion tank






Answer: A

The most important rule in safe operation of a steam heating boiler is:

The most important rule in safe operation of a steam heating boiler is:

a. Operate the burner properly
b. Keep the water level in the boiler at the proper level
c. Maintain the proper operation of automatic controls
d. Maintain the correct level in the altitude gauge
e. Ensure air is kept out of the system





Answer: B

During warm-up of a cold hot water boiler excessive pressure build-up is prevented by

During warm-up of a cold hot water boiler excessive pressure build-up is prevented by

a) a very slow warm-up
b) an expansion tank
c) a pressure relief valve
d) opening the boiler outlet valve
e) venting the system





Answer: B

A hot water boiler is protected from over pressure by means of

A hot water boiler is protected from over pressure by means of

a) a safety pop valve
b) a high limit pressure control
c) an expansion valve
d) an air release valve
e) a safety relief valve






Answer: E

The expansion and contraction rod type of temperature relief device will open the valve at __________ degrees Celsius and close it at __________ degrees Celsius.

The expansion and contraction rod type of temperature relief device will open the valve at __________ degrees Celsius and close it at __________ degrees Celsius.

a) 99 and 80
b) 100 and 71
c) 101.3 and 75
d) 99 and 71
e) 100 and 80




Answer: D

With the fusible plug type of temperature relief device, the fusible plug will melt at __________ degrees Celsius and allow hot water to escape.

With the fusible plug type of temperature relief device, the fusible plug will melt at __________ degrees Celsius and allow hot water to escape.

a) 131
b) 121
c) 101.3
d) 100
e) 99






Answer: E

Hot water heating boilers must be equipped with a

Hot water heating boilers must be equipped with a

a) thermometer
b) fusible plug
c) return trap
d) blow down tank
e) steam pressure gage




Answer: A

When the pressure pointer of a closed system reads lower than the altitude pointer the

When the pressure pointer of a closed system reads lower than the altitude pointer the

a) system is full of water
b) expansion tank level will be high
c) boiler is being over-fired
d) gage is faulty
e) system requires water

Answer: E

The dial of a pressure gauge on a hot water boiler indicating SI units can be graduated in

The dial of a pressure gauge on a hot water boiler indicating SI units can be graduated in

a) metres of mercury
b) mm of water
c) mPa
d) psi
e) kPa





Answer: E

The lever handle of the shut-off cock between a pressure or altitude gauge and a hot water boiler should be __________ to the pipe in which it is located when the cock is open.

The lever handle of the shut-off cock between a pressure or altitude gauge and a hot water boiler should be __________ to the pipe in which it is located when the cock is open.

a) perpendicular
b) parallel
c) adjacent
d) opposite
e) tangent





Answer: B

Siphon is not required between a pressure or an altitude gauge and a hot water boiler since these boilers are

Siphon is not required between a pressure or an altitude gauge and a hot water boiler since these boilers are

a) filled with steam
b) partially filled with steam
c) partially filled with air
d) filled with water
e) filled with water and air mixtures




Answer: D

When a closed expansion tank is used and the system is cold

When a closed expansion tank is used and the system is cold

a) the auto fill valve will maintain a system minimum pressure
b) the tank level will be high
c) there will be no air in the tank
d) the possibility of air in the system will be high
e) the tank should be manually filled




Answer: B

An altitude gauge on a hot water heating boiler is used to indicate:

An altitude gauge on a hot water heating boiler is used to indicate:

a. Expansion tank temperature
b. Boiler temperature
c. Furnace draft
d. The highest level of water in the system
e. The height of the boiler





Answer: D

The entrained air in a hot water heating system is directed to the:

The entrained air in a hot water heating system is directed to the:

a. Relief valve
b. Boiler
c. Radiator vents
d. Expansion tank
e. Atmosphere





Answer: D

When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the:

When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the:

a. Circulating pumps cavitate
b. Pressure build up opens the safety relief valve
c. Heating system becomes noisy
d. Circulation pump will stop
e. The boiler water will back-up into the potable water system





Answer: B

A closed expansion tank is often equipped with:

A closed expansion tank is often equipped with:

a. A gauge glass
b. A pressure relief valve
c. An automatic fill valve
d. A circulating pump
e. A thermometer





Answer: A

A closed type expansion tank in a hot water heating system must:

A closed type expansion tank in a hot water heating system must:

a. Be full of water at all times
b. Have a vent open to atmosphere at all times
c. Be located three meters above the boiler
d. Be located no higher than the top of the boiler
e. Be partially filled with air at all times





Answer: E

A pressure or altitude gauge for a hot water heating boiler:

A pressure or altitude gauge for a hot water heating boiler:

a. Must be calibrated in kPa
b. Shall have a dial scale at least three times the maximum allowable working pressure
c. Does not require a siphon
d. Must have a temperature dial
e. Must be of 51 mm pipe size





Answer: C

In a closed expansion tank system an air separator:

In a closed expansion tank system an air separator:

a. Removes air from the system
b. Is installed at the boiler inlet
c. Is installed at the boiler outlet
d. Directs air into the expansion tank
e. Removes air from the expansion tank





Answer: D

An automatic fill valve for a hot water boiler:

An automatic fill valve for a hot water boiler:

a. Will maintain maximum system pressure at all times
b. Operates to maintain a constant boiler water level
c. Is not mandatory
d. Operates to maintain a constant expansion tank level.
e. Can be used with an open tank system

Answer: C

When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be:

When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be:

a. Attached to an air separator
b. Filled
c. Removed
d. Drained
e. Replaced





Answer: D

The temperature indicator of a hot water boiler should indicate water temperature:

The temperature indicator of a hot water boiler should indicate water temperature:

a. At the boiler inlet
b. In the expansion tank
c. Midway through the system
d. At the boiler outlet
e. In the boiler





Answer: D

The pressure relief valve on a hot water boiler:

The pressure relief valve on a hot water boiler:

a. Should be installed on the boiler or close to it
b. Can be installed anywhere in the system
c. Must be at least 51 mm pipe size
d. Does not require annual checking or testing
e. Can be installed with an isolation valve




Answer: A

If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate:

If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate:

a. The expansion tank is empty.
b. There is probably a leak in the system
c. There has been a drastic change in the water quality
d. The return pumps are not working
e. The flow meter is not working properly

Answer: B

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure.

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure.

a. 0.5
b. 1
c. 1.5
d. 2
e. 2.5





Answer: C

Boiler stop valves shall be:

Boiler stop valves shall be:

a. Always of the outside screw and yoke design
b. Globe valves
c. Identified with durable tags
d. Installed on horizontal piping only
e. Throttled during operation

Answer: C

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set.

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set.

a. 1.5
b. 2
c. 2.5
d. 3
e. 3.5




Answer: E

How many pressure relief valves shall a hot water heating boiler have?

How many pressure relief valves shall a hot water heating boiler have?

a. None
b. At least one
c. At least two
d. At least three
e. At least four

Answer: B

An expansion tank is used to:

An expansion tank is used to:

a. Dampen pulsations in the water pressure
b. Increase water temperature
c. Allow for the expansion of the water
d. Provide more efficient water circulation
e. Allow free expansion of the steam





Answer: C

Hot water heating boilers have stop valves in their supply and return piping:

Hot water heating boilers have stop valves in their supply and return piping:

a. To allow for better warm ups
b. To prevent water from entering another in-service unit
c. So that each boiler can have separate water treatment
d. So that the boiler can be drained without draining the system
e. To permit annual maintenance





Answer: D

An agency or code with which fittings must comply is:

An agency or code with which fittings must comply is:

a. Health and Safety Code
b. Fittings and Boiler Parts Act
c. Boiler Repair Code
d. Plumbing Gas Act
e. ASME Code





Answer: E

A compound gauge shows both:

A compound gauge shows both:

a. Pressure and vacuum
b. Kilopascals and Pounds per square inch
c. Pressure and temperature
d. Pressure and head





Answer: A

The cross-section of a Bourdon tube is generally

The cross-section of a Bourdon tube is generally

a) circular
b) round
c) cylindrical
d) spherical
e) oval





Answer: E

As the boiler pressure increases, the bourdon tube of the pressure gauge will

As the boiler pressure increases, the bourdon tube of the pressure gauge will

a) tend to straighten
b) compress more
c) become less circular in cross-section
d) become smaller in diameter
e) tend to twist





Answer: A

The working medium in the dead weight tester is

The working medium in the dead weight tester is

a) air
b) water
c) heavy oil
d) medium weight oil
e) alcohol





Answer: D

When installing a siphon it

When installing a siphon it

a) must be perpendicular to the piping
b) must be dry
c) should be downstream of an inspectors' test connection
d) should be first filled with water
e) shall be as close





Answer: D

A function of a Bourdon tube gage hairspring is

A function of a Bourdon tube gage hairspring is

a) return the tube to its zero position
b) keep the pointer on zero
c) eliminate backlash
d) return the pointer to zero
e) eliminate pointer linearity






Answer: C

The purpose of the tee fitting on the piping leading to a boiler steam pressure gauge is to:

The purpose of the tee fitting on the piping leading to a boiler steam pressure gauge is to:

a. Bypass the siphon tube
b. Test a sample of steam for purity
c. Install the boiler inspector's pressure gauge
d. Blowoff condensate from the pigtail
e. Vent air from the pressure gauge






Answer: C

One purpose of the small valve on top of the shell or the water column on most boilers is to:

One purpose of the small valve on top of the shell or the water column on most boilers is to:

a. Signal when the boiler is full of water r.
b. allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum.
c. allow water to escape before the steam stop valve is opened during the warm-up period.
d. allow air to escape from the boiler when the boiler is being filled with water.
e. allow air into the boiler when the boiler is being filled with water.

Answer: D

An inspector's test connection for a boiler pressure gauge:

An inspector's test connection for a boiler pressure gauge:

a. Should be located upstream of a siphon
b. Should be of 12.7 mm NPT size
c. Is required on all boilers
d. Shall be located adjacent to the boiler's pressure gauge
e. Is mandatory by code on LP boilers only






Answer: D

When using a dead weight tester, the effect of friction:

When using a dead weight tester, the effect of friction:

a. Is reduced by rotating the platform
b. Will cause a higher than desired reading
c. Is negligible
d. Is eliminated with a lubricant
e. Is compensated for mathematically






Answer: A

The minimum size of the blowoff piping of a steam heating boiler is:

The minimum size of the blowoff piping of a steam heating boiler is:

a. 75 mm
b. 51 mm
c. 20 mm
d. 19 mm
e. 15 mm





Answer: D

All boiler fittings not properly or clearly identified should be:

All boiler fittings not properly or clearly identified should be:

a. Rejected
b. Used for low pressure services only
c. First approved for use by the boiler inspector
d. Acceptable for most powerhouse applications.
e. Sent back to the manufacturer for proper identification.




Answer: A

A globe valve should be used in the feedwater line:

A globe valve should be used in the feedwater line:

a. At all times
b. Whenever it may be used for throttling purposes
c. Only if it is of the outside screw and yoke type
d. When the system is of multi-boiler installation
e. Because of its low resistance to flow





Answer: B

How many blow-off valves does a steam heating boiler require?

How many blow-off valves does a steam heating boiler require?

a. None
b. One
c. Two
d. Three
e. Four




Answer: B

An indication of a pressure gauge not performing properly is:

An indication of a pressure gauge not performing properly is:

a. The needle fluctuating
b. The needle not returning to zero when gauge is depressurised
c. The safety valve popping when gauge reads normal
d. A reading that is not the same as some other gauge
e. A dial that rotates






Answer: B

An outside screw and yoke valve:

An outside screw and yoke valve:

a. Must be a gate valve
b. Readily shows its operating position
c. Is difficult to lubricate
d. Requires no packing
e. Has a non-rising stem





Answer: B

A boiler feedwater stop valve:

A boiler feedwater stop valve:

a. Should never be used to control water level
b. Is used to isolate the deaerator
c. Must be a globe valve
d. Should be located close to the feedwater pump
e. May be a globe valve, provided water enters below the disc





Answer: E

Boiler blowoff piping has a specific size range, depending upon:

Boiler blowoff piping has a specific size range, depending upon:

a. Water impurities
b. The type of boiler
c. Boiler capacity
d. Operating pressure
e. Blowoff line length





Answer: C

Which of the following units would the pressure gauge on a steam boiler likely use?

Which of the following units would the pressure gauge on a steam boiler likely use?

a. Pascals
b. Pascals per square metre
c. Kilograms per square centimeter
d. Kilograms per hour
e. Kilopascals




Answer: E

The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:

The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:

a. Air from entering the gauge
b. Water from entering the gauge
c. Hot steam from entering the gauge
d. Air from entering the boiler
e. Condensate returning to the boiler from the pigtail




Answer: C

A steam boiler is regularly blown off in order to:

A steam boiler is regularly blown off in order to:

a. Clean the soot and carbon out of the firebox and tubes
b. Lower the operating water level in the boiler
c. Discharge sediment and scale forming matter from the boiler
d. Test the rated relieving capacity of the safety valves fitted to the boiler
e. Restore the drum level






Answer: C

When the steam outlet of a boiler is 51mm or larger, the boiler steam outlet stop valve should be a:

When the steam outlet of a boiler is 51mm or larger, the boiler steam outlet stop valve should be a:

a. Non-rising stem globe valve
b. Rising spindle gate or globe valve
c. Non-rising spindle gate valve
d. Rising spindle plug valve
e. Motorized butterfly valve






Answer: B

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to:

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to:

a. Permit slower system warm-ups
b. Allow the boiler to be isolated from the system
c. Prevent steam from entering another boiler
d. Allow each boiler to supply only a part of the system
e. Permit different system pressures





Answer: B

An essential fitting between the boiler and the steam pressure gauge is a:

An essential fitting between the boiler and the steam pressure gauge is a:

a. Check valve
b. Gate valve
c. Gauge glass
d. Siphon
e. Steam trap





Answer: D

According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between

According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between

a. 100 to 300 kPa
b. 200 to 414 kPa
c. 200 to 300 kPa
d. 125 to 325 kPa
e. 230 to 414 kPa





Answer: B

A boiler feedwater stop valve:

A boiler feedwater stop valve:

a. Should never be used to control water level
b. Is used to isolate the deaerator
c. Must be a globe valve
d. Should be located close to the feedwater pump
e. May be a globe valve, provided water enters below the disc

Answer: E

The prime importance of boiler fittings is:

The prime importance of boiler fittings is:

a. Economics
b. To satisfy regulations
c. Safety & efficiency
d. Convenience
e. Ease of operations





Answer: C

Boiler blowoff piping:

Boiler blowoff piping:

a. Can be reduced in size after the blowdown valves
b. Must be full size to the point of discharge
c. Must be at least 51 mm in size
d. Can have valves of a smaller size than piping
e. May discharge to the sewer system





Answer: B

Combination burners use:

Combination burners use:

a. Two different gas burners arrangements
b. Two different pilot flames
c. Two different fuels
d. Two different air supplies





Answer: C

Premix Percentage is the another name for:

Premix Percentage is the another name for:

a. The quantity of gas in the air/gas mixture
b. Primary air
c. Secondary air
d. The quantity of gas in the secondary air

Answer: B

Which features do Motorized Gas Valves have? 1. Slow to open, quick to close 2. Quick to open, slow to close 3. Fail-safe 4. Spring and supply pressure to close 5. Spring and supply pressure to open

Which features do Motorized Gas Valves have?
1. Slow to open, quick to close
2. Quick to open, slow to close
3. Fail-safe
4. Spring and supply pressure to close
5. Spring and supply pressure to open

a. 1, 4
b. 1, 3, 4
c. 2, 3, 4
d. 2, 5
e. 1, 3, 5





Answer: B

To prevent a furnace puff, larger size solenoid type oil and gas valves usually have a delayed opening action so that it takes __ seconds to open the valve up wide, but they close instantly when de-energized.

To prevent a furnace puff, larger size solenoid type oil and gas valves usually have a delayed opening action so that it takes __ seconds to open the valve up wide, but they close instantly when de-energized.

a. 1 to 3
b. 4 to 5
c. 2 to 4
d. 5 to 7
e. 6 to 8





Answer: B

Diaphragm Gas Valve is popular as a control valve for?

Diaphragm Gas Valve is popular as a control valve for?

a. low capacity gas-fired heating boilers
b. high capacity gas-fired heating boilers
c. gas stoves
d. hot water heaters
e. C and D



Answer: A

Which pilots are ignited electrically by means of electrodes?

Which pilots are ignited electrically by means of electrodes?

a) interrupted
b) intermittent
c) continuous
d) all of the above
e) A and B

Answer: E

An ___ pilot is used to light off the main burner but does not burn throughout the burner "on" period.

An ___ pilot is used to light off the main burner but does not burn throughout the burner "on" period.

a) interrupted
b) intermittent
c) automatic
d) manual
e) continuous






Answer: A

A ____ pilot burns at all times and has to be manually ignited.

A ____ pilot burns at all times and has to be manually ignited. 

a) interrupted
b) intermittent
c) automatic
d) manual
e) continuous






Answer: E

The __________ pilot is most often used on small boilers.

The __________ pilot is most often used on small boilers.

a) interrupted
b) intermittent
c) automatic
d) manual
e) continuous





Answer: E

One of the advantages of the refractory (gas) burner is the

One of the advantages of the refractory (gas) burner is the

a) low cost
b) gas and air mixture is thoroughly preheated before it enters the furnace
c) flue gases are recirculated back to the furnace to increase the furnace temperature
d) flue gases are thoroughly post-heated before they leave the furnace
e) flame is directed to areas where it is needed the most

Answer: B

A refractory burner disadvantage is

A refractory burner disadvantage is

a) high initial cost
b) too much fuel preheat
c) low radiant heat
d) low combustion efficiency
e) overheating of boiler metal




Answer: A

When an atmospheric gas fired burner is burning fuel properly:

When an atmospheric gas fired burner is burning fuel properly:

a. It will have a blue, non-luminous flame
b. The furnace will pulsate
c. There will be no turbulence
d. It will have a long bright yellow flame
e. It will have perfect combustion.

Answer: A

An atmospheric premix burner has air entering around the flame that is termed:

An atmospheric premix burner has air entering around the flame that is termed:

a. Primary air
b. Secondary air
c. Atomizing air
d. Combustion air
e. Tertiary air




Answer: B

Atmospheric burners are used for:

Atmospheric burners are used for:

a. Gas stoves, hot water heaters, heating furnaces and many heating boilers
b. Ring type burners
c. Coal firing
d. Lowering the relative humidity in the combustion air
e. Preheating the combustion air




Answer: A

Large capacity burners:

Large capacity burners:

a. Require high flow on ignition
b. Are very safe relative to puff-back
c. Require only a small pilot flame
d. Should have minimum flow on ignition
e. Are too hazardous and not recommended




Answer: D

The main function of a gas burner is:

The main function of a gas burner is:

a. Atomization of the fuel
b. A source of ignition
c. Provide thorough mixing of the fuel and air
d. Regulation of the fuel flow
e. Air flow control






Answer: C

The Venturi tube in the atmospheric burner mixing head has a:

The Venturi tube in the atmospheric burner mixing head has a:

a. Gradually decreasing cross-sectional area
b. Gradually increasing cross-sectional area
c. Uniform cross-section throughout
d. Sharply increasing cross-sectional area
e. Series of internal ridges, to promote mixing






Answer: B

An atmospheric burner head which is very popular on heating boilers is the:

An atmospheric burner head which is very popular on heating boilers is the:

a. Refractory type
b. Star type
c. Ring type
d. Rectangular type
e. Ribbon ring type





Answer: D

A solenoid type fuel valve;

A solenoid type fuel valve;

a. Is held closed by fuel pressure
b. Always opens rapidly
c. Is held closed by electrical current
d. Closes slowly
e. Does not have positive shut-off






Answer: A

Which of the following is NOT a pilot for a gas burner?

Which of the following is NOT a pilot for a gas burner? 

a. Continuous
b. Intermittent
c. Manual
d. Interrupted
e. Standing






Answer: C

An intermittent pilot:

An intermittent pilot:

a. Lights the main flame then extinguishes
b. Must be manually ignited
c. Lights the main flame and remains on until the main flame is extinguished
d. Remains on after the main flame extinguishes
e. Lights a pilot flame then extinguishes





Answer: C

A very popular packaged boiler gas burner is the:

A very popular packaged boiler gas burner is the:

a. Ring burner
b. In-duct burner
c. Post mix atmospheric burner
d. Mechanical atomizing burner
e. Cluster nozzle burner




Answer: A

Gas burners for heating boilers can be divided into two general classes:

Gas burners for heating boilers can be divided into two general classes:

a. Mixing and non-mixing
b. Refractory and ribbon-type
c. In-shot and up-shot
d. Pre and after mix
e. Atmospheric and fan-assist




Answer: D

One of the advantages of using natural gas as a fuel in a boiler is:

One of the advantages of using natural gas as a fuel in a boiler is:

a. No storage space is required
b. Low cost
c. Abundance in supplies
d. Portability
e. No standby fuel is necessary




Answer: A

The amount of pre-mix air to an atmospheric burner is typically:

The amount of pre-mix air to an atmospheric burner is typically:

a. 10% to 12%
b. 5% to 8%
c. 20% to 50%
d. 30% to 40%
e. 100%





Answer: D

If the power is cut off to an automatic gas valve, the valve will:

If the power is cut off to an automatic gas valve, the valve will:

a. Close slowly
b. Close immediately
c. De-pressurize the gas train
d. Chatter
e. Open widely

Answer: B

The advantage of a motorized (hydramotor) gas valve is that the valve opens _____, thus preventing "furnace puff".

The advantage of a motorized (hydramotor) gas valve is that the valve opens _____, thus preventing "furnace puff".

a. Slowly
b. Quickly
c. Immediately
d. Slightly
e. Halfway





Answer: A

The purpose of the deflector vanes in the center of a ring (gas) burner is to:

The purpose of the deflector vanes in the center of a ring (gas) burner is to:

a. Atomize the gas particles
b. Increase the gas velocity
c. Decrease the air velocity
d. Promote turbulence of gas and air mixture
e. Increase the temperature of the furnace

Answer: D

On a two fixed capacity nozzle system both burners are lit when the system is:

On a two fixed capacity nozzle system both burners are lit when the system is:

a. Low fire
b. Initial start up
c. High fire
d. On-off cycling






Answer: C

The purpose of a cut off valve is to:

The purpose of a cut off valve is to:

a. Prevents too low of an oil pressure to supply the burner
b. Cut off the burner is to high
c. Relieve the pressure of the fuel in an over-pressure situation
d. None of the above





Answer: A

The purpose of pressure relief valve on a constant capacity fuel supply is to:

The purpose of pressure relief valve on a constant capacity fuel supply is to:

a. Relieve the pressure from the oil line any discharge it to atmosphere
b. Re-direct fuel oil that above the set pressure back to the tank or strainer
c. Protect the oil tank from rupturing
d. All the above





Answer: B

A modulating capacity mechanical atomizing oil burner is also called an?

A modulating capacity mechanical atomizing oil burner is also called an?

a. Constant capacity
b. Steam atomized
c. Wide range atomizer
d. Centrifugal Cup

Answer: C

An air atomizing compressor is usually

An air atomizing compressor is usually

a) a variable displacement type
b) a centrifugal type
c) an axial type
d) a positive displacement type
e) a regenerative type

Answer: D

A time delay oil valve

A time delay oil valve

a) opens when the pump starts
b) opens once ignition is verified
c) opens on flame failure
d) is located on the return line
e) is upstream of the pressure regulating valve

Answer: B

A relief valve is placed on the discharge of a fuel oil pump

A relief valve is placed on the discharge of a fuel oil pump

a) because the pump is a dynamic type
b) so burner design pressure is not exceeded
c) so burner capacity is maintained
d) to prevent pump rupture
e) to prevent over-firing of the boiler



Answer: B

Oil burners can be divided into three classes:

Oil burners can be divided into three classes:

1. air and steam atomizing burners
2. mechanical or pressure atomizing burners
3. centrifugal or rotary cup burners
4. atmospherical pressure burners
5. gravitational pressure burners


a) 1, 2, and 3
b) 1, 2, and 4
c) 2, 3, and 4
d) 3, 4, and 5
e) 2, 3, and 5




Answer: A

The reducing of oil into very small particles is termed

The reducing of oil into very small particles is termed

a) fluidization
b) fractionation
c) turbulence
d) atomization
e) distillation





Answer: D

An atomizing air compressor is usually:

An atomizing air compressor is usually:

a. A variable displacement type
b. A centrifugal type
c. An axial type
d. A small, rotary air compressor
e. A regenerative type





Answer: D

When using mechanical fuel oil atomization:

When using mechanical fuel oil atomization:

a. 70 kPa steam pressure is required at the burner
b. Dry saturated steam or superheated steam should be used
c. High pump pressure is required
d. Steam pressure is required to keep the bypass open
e. 35 to 40 kPa oil pressure is required

Answer: C

The design capacity of a constant capacity mechanical atomizer is a function of:

The design capacity of a constant capacity mechanical atomizer is a function of:

a. Orifice size
b. Pump speed
c. Pump size
d. Supply pressure
e. Oil viscosity




Answer: E

The pressure range for pressure-atomizing burners fired with light fuel oil is approximately:

The pressure range for pressure-atomizing burners fired with light fuel oil is approximately:

a. 50 to 100 kPa
b. 150 to 250 kPa
c. 300 to 550 kPa
d. 550 to 700 kPa
e. 700 to 850 kPa







Answer: D

The compressed air used as atomizing air in the air atomizing oil burner is also called:

The compressed air used as atomizing air in the air atomizing oil burner is also called:

a. Secondary air
b. Primary air
c. Pre-mixed air
d. Combustion air
e. Post-compressed air





Answer: B

The two basic varieties of mechanical atomizing oil burners are the:

The two basic varieties of mechanical atomizing oil burners are the:

a. Variable capacity and modulating burners
b. Constant and variable capacity burners
c. Modulating and cluster burners
d. Rotary and reciprocating cup burners
e. light oil and heavy oil burners





Answer: B

To prevent the possibility of a furnace explosion, it is important that the furnace is _____ before the igniter is energized and fuel is supplied to the burner nozzle(s).

To prevent the possibility of a furnace explosion, it is important that the furnace is _____ before the igniter is energized and fuel is supplied to the burner nozzle(s).

a. Pre-heated
b. Post-heated
c. Purged
d. Cooled
e. Pressurized






Answer: C

When a greater than normal amount of combustible mixture is ignited, the result may be:

When a greater than normal amount of combustible mixture is ignited, the result may be:

a. A boiler explosion
b. A puff-back
c. A negative furnace pressure
d. A too rapid boiler warm-up
e. Liquid fuel entering the furnace





Answer: B

Intermediate and high fire burner nozzles have higher capacities than the primary burner nozzle:

Intermediate and high fire burner nozzles have higher capacities than the primary burner nozzle:

a. To give greater firing variations
b. To prevent pressure surges
c. To prevent ignition puff-backs
d. Because of the pump being of the positive displacement type
e. To allow slower boiler warm-ups





Answer: E

A multi-burner cluster has secondary and tertiary nozzles ignited by:

A multi-burner cluster has secondary and tertiary nozzles ignited by:

a. An igniter spark
b. An intermittent pilot flame
c. An interrupted pilot
d. The primary burner
e. A continuous pilot





Answer: D

Before being pumped to the burner, heavy oils are heated to approximately:

Before being pumped to the burner, heavy oils are heated to approximately:

a. 203°C
b. 95°C
c. 115°C
d. 75°C
e. 150°C

Answer: B

To which of the following oil burners is the oil supplied under high pressure?

To which of the following oil burners is the oil supplied under high pressure?

a. Mechanical atomizing burner
b. Air atomizing burner
c. Rotary cup burner
d. Steam atomizing burner
e. Multi-spud burner

Answer: A

An air atomizing burner utilizes an air pressure of approximately:

An air atomizing burner utilizes an air pressure of approximately:

a. 15 kPa
b. 150 kPa
c. 75 kPa
d. 95 kPa
e. 100 kPa






Answer: E

Regulations require that the minimum distance between an oil-fired furnace and an indoor oil storage tank must be:

Regulations require that the minimum distance between an oil-fired furnace and an indoor oil storage tank must be:

a. 7 m
b. 5.2 m
c. 2.1 m
d. 4.7 m
e. 9.8 m





Answer: C

A time delay oil valve:

A time delay oil valve:

a. Opens when the oil pump starts
b. Opens 5 to 15 seconds after ignition begins.
c. Opens on flame failure
d. Is located on the return line
e. Is upstream of the pressure regulating valve




Answer: B

A modulating pressure atomizer has its return oil flow regulated by:

A modulating pressure atomizer has its return oil flow regulated by:

a. A modulating valve to the burner
b. A modulating valve in the return line
c. A solenoid valve in the return line
d. A pressure regulator
e. Pump speed

Answer: B

Which of the following is NOT a type of oil burner?

Which of the following is NOT a type of oil burner? 

a. Atmospheric burners
b. Steam atomizing burners
c. Mechanical or pressure atomizing burners
d. Centrifugal or rotary cup burners
e. Air atomizing burners




Answer: A

Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately:

Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately:

a. 10 kPa
b. 15 kPa
c. 80 kPa
d. 35 kPa
e. 70 kPa





Answer: D

The cast-iron sectional boiler is generally used for steam and hot water heating systems in

The cast-iron sectional boiler is generally used for steam and hot water heating systems in 

a. Small sized buildings
b. Medium sized buildings
c. Large sized buildings
d. All of the above
e. A and B





Answer: E

Cast-iron boiler capacity

Cast-iron boiler capacity

a) is very large compared to steel boilers
b) can be increased by simply adding sections
c) cannot be increased once assembly is completed
d) is not a function of section numbers
e) can be increased by increasing section size






Answer: B

To prevent flue gases from escaping in a cast iron sectional boiler, the spaces between the sections are sealed with high temperature

To prevent flue gases from escaping in a cast iron sectional boiler, the spaces between the sections are sealed with high temperature

a) silicon chalking
b) foam insulation
c) plastic insulation
d) putty
e) asbestos rope




Answer: E

The sections of cast iron boilers are mainly designed to obtain maximum

The sections of cast iron boilers are mainly designed to obtain maximum

a) water space
b) steam space
c) water circulation
d) heat transfer
e) steam output






Answer: D

Cast-iron boiler sections maximize heat transfer by

Cast-iron boiler sections maximize heat transfer by

a) utilizing as few passes as possible
b) vertical firing
c) exposing as large a surface as possible to the hot gases
d) utilizing an external furnace
e) using four push nipples per section






Answer: C

A disadvantage of a cast iron boiler is:

A disadvantage of a cast iron boiler is:

a. It is subject to corrosion
b. Its difficult assembly
c. Its extremely high cost
d. Its efficiency
e. Its pressure limitations






Answer: E

Boiler water legs:

Boiler water legs:

a. Increase the radiant heating surface
b. Surround the furnace entirely
c. Make water treatment less critical
d. Support the boiler on concrete piers
e. Make waterside maintenance easier




Answer: A

One advantage of cast iron boilers is:

One advantage of cast iron boilers is:

a. Their high factor of brittleness
b. Reduced vibration due to their heavy foundations
c. Unlimited operating pressures
d. Resistance to corrosion
e. Their capacity is fixed and cannot be increased

Answer: D

The ratio of heat released to heat transferred to boiler water is known as:

The ratio of heat released to heat transferred to boiler water is known as:

a. Combustion efficiency
b. Heating surface efficiency
c. Boiler efficiency
d. Section ratio
e. Enthalpy transfer ratio




Answer: C

The steam and water spaces of a cast iron sectional boiler are connected by:

The steam and water spaces of a cast iron sectional boiler are connected by:

a. Tie rods
b. Tie nipples
c. Hydraulic jacks
d. Steel studs
e. Push nipples





Answer: E

Modular cast iron boiler water flow is:

Modular cast iron boiler water flow is:

a. Continuous through all modules
b. Connected in series
c. Intermittent, occurring only while the unit is firing
d. Always vertically upwards
e. Done without the use of headers or manifolds





Answer: A

In a vertical sectional boiler, the sections are placed:

In a vertical sectional boiler, the sections are placed:

a. One above the other
b. Side by side
c. On the furnace
d. Above the draft hood
e. 180° to each other




Answer: B

The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:

The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:

a. Effectiveness of heat transfer
b. Steam space
c. Water space
d. Water circulation
e. Steam quality




Answer: A

Heating boilers attain maximum efficiency only when they are operated:

Heating boilers attain maximum efficiency only when they are operated:

a. Intermittently at 90% of the load
b. Intermittently at half load
c. Continuously at full load
d. Continuously at half load
e. Continuously at 75% of the load




Answer: C

In a cast iron modular heating boiler, the operation of the burner of each module is controlled by a _____ that starts or stops modules in sequence as load demand increases or decreases.

In a cast iron modular heating boiler, the operation of the burner of each module is controlled by a _____ that starts or stops modules in sequence as load demand increases or decreases.

a. Temperature sensor
b. Step controller
c. Thermostat
d. Temperature transmitter
e. Flow controller



Answer: B

Most low capacity cast iron boilers:

Most low capacity cast iron boilers:

a. Cannot be site assembled
b. Can withstand higher pressures
c. Will pass through standard size doorways
d. Are factory assembled as packaged units
e. Require special foundations




Answer: C

The sections of a cast iron sectional boiler are held together by:

The sections of a cast iron sectional boiler are held together by:

a. Cast iron pipes
b. High-temperature rope
c. Steel studs
d. Push nipples and tie rods
e. Stay bolts



Answer: D

The common standard control modes for a plant control system are

The common standard control modes for a plant control system are

a) integral and derivative
b) proportional and reset
c) proportional, reset, and integral
d) reset, integral, and rate
e) derivative, proportional, and integral





Answer: E

A typical use of a mainframe computer system in a process would be

A typical use of a mainframe computer system in a process would be

a) the operation of a modulating control valve
b) acting as a "host" computer
c) producing hard copies of a plant system
d) producing graphics of a plant system
e) storing information onto a floppy disk





Answer: A

A computer normally displays information to the operator via

A computer normally displays information to the operator via

a. a CRT or LCD
b. an icon
c. a CAD
d. a Modem
e. a CPU




Answer: A

The main function of a mainframe computer system is to:

The main function of a mainframe computer system is to:

a. Evaluate systems by comparison
b. Rapidly process large amounts of data
c. Perform only a specific dedicated task
d. Produce hypothetical solutions to problems
e. Act as a networking switch






Answer: B

The type of circuit used to store (write) and retrieve (read) information from a computer is known as its:

The type of circuit used to store (write) and retrieve (read) information from a computer is known as its:

a. Bytes
b. Motherboard
c. RAM
d. CPU
e. ROM





Answer: C

Run time totals, recorded by a computer, are commonly used:

Run time totals, recorded by a computer, are commonly used:

a. In graphic displays
b. For inventory control
c. For logic supervisory systems
d. For maintenance management
e. With a modem





Answer: D

Digital output signals are processed by _____ before an analog controls can react to them.

Digital output signals are processed by _____ before an analog controls can react to them.

a. Digital receivers
b. Logic controllers
c. Modems
d. Analog converters
e. Integrated circuits




Answer: D

A device used to convert audio tones to computer language is a:

A device used to convert audio tones to computer language is a:

a. Transmitter
b. Multiplexer
c. Plotter
d. Modulator/demodulator
e. CPU





Answer: D

Data cannot be permanently stored on a

Data cannot be permanently stored on a

a. CD-ROM
b. Hard disk
c. CPU
d. Monitor
e. DVD-ROM





Answer: D

An analog control loop output must be put through a _____ before the computer can react to the signal.

An analog control loop output must be put through a _____ before the computer can react to the signal.

a. Digital converter
b. Signal inverter
c. ROM detector
d. Modem
e. CPU






Answer: A

Transmitters that transmit digital codes directly to a computer are known as:

Transmitters that transmit digital codes directly to a computer are known as:

a. Digital transmitters
b. Smart transmitters
c. Analog transmitters
d. Pneumatic transmitters
e. Modems





Answer: B

A multiplexing sequence may be repeated as frequently as

A multiplexing sequence may be repeated as frequently as

a. Once per hour
b. Twice per minute
c. Twice per second
d. Four times or more per second
e. Fifty times per second





Answer: D

A process computer connected to digital inputs is protected from harmful voltages by means of:

A process computer connected to digital inputs is protected from harmful voltages by means of:

a. Splitter bars
b. Fuses
c. Isolating circuits
d. Circuit breakers
e. Stand-alone devices





Answer: C

Soft keying is:

Soft keying is:

a. Done only with laptop computers
b. Done to make the computer quicker and easier to use
c. A method of pressing a key twice before a result is obtained
d. The same as using a mouse or joystick
e. Also called "double-clicking."




Answer: B

Sharing and transferring information between computers is termed:

Sharing and transferring information between computers is termed:

a. Central processing
b. Multiplexing
c. Plotting
d. Number crunching
e. Networking





Answer: E

Which of the following would be the best choice for a powerhouse control-room installation?

Which of the following would be the best choice for a powerhouse control-room installation? 

a. A minicomputer
b. A mainframe computer
c. A microcomputer
d. A netbook computer
e. A laptop computer




Answer: C

Inputs for logic and supervisory computer functions are mainly:

Inputs for logic and supervisory computer functions are mainly:

a. By switch contacts
b. Actions of an operator using the keyboard
c. Stored on a disk which is required for operation
d. Controlled by relays
e. Non-decision making





Answer: A

The main component of any computer is the:

The main component of any computer is the:

a. Keyboard
b. Screen
c. Modem
d. Printer
e. Central processing unit




Answer: E

When personal computers are linked together and information flows between them, it is called:

When personal computers are linked together and information flows between them, it is called:

a. Telecommunicating
b. Networking
c. Teleconferencing
d. Linking
e. Hardware sharing





Answer: B

Which of the following is a programming language?

Which of the following is a programming language?

a. English
b. Word
c. Desktop publishing
d. Latin
e. Pascal




Answer: E

A lockout switch will energize after __ to __ seconds.

A lockout switch will energize after __ to __ seconds.

a. 5 to 10
b. 15 to 30
c. 10 to 15
d. 20 to 40
e. 15 to 25






Answer: B

On-off controls are common on?

On-off controls are common on?

a. firetube boilers
b. watertube boilers
c. small package boilers
d. large package boilers
e. all of the above

Answer: C

If the damper motor does not operate on a boiler which one would NOT be the possible cause?

If the damper motor does not operate on a boiler which one would NOT be the possible cause?

a. Damper positioning switch in wrong position.
b. Linkage loose or jammed.
c. The lock-out switch has tripped.
d. Motor does not drive to "open" or "close" during prepurge or close on burner shutdown.
e. Motor does not operate on demand.

Answer: C

If the burner stays on low fire on a boiler which one would NOT be the possible cause?

If the burner stays on low fire on a boiler which one would NOT be the possible cause?

a. Boiler pressure above high-low fire control setting.
b. Damper positioning switch in wrong
c. Inoperative damper motor.
d. Flame detector weak or defective.
e. Defective high-low fire or modulating control.





Answer: D

If shutdown occurs during firing a boiler which one would NOT be the possible cause?

If shutdown occurs during firing a boiler which one would NOT be the possible cause?

a. Loss or stoppage of fuel
b. Defective fuel valve, loose electrical connections
c. Flame detector weak or defective
d. Lens dirty or sight tube obstructed
e. Boiler pressure above high-low fire control setting.






Answer: E

If pilot or low-fire flame occurs in a boiler which one would NOT be the possible cause?

If pilot or low-fire flame occurs in a boiler which one would NOT be the possible cause?

a. Low fire switch open.
b. Insufficient pilot or low fire flame.
c. Supply to main nozzles restricted or cut off.
d. Inoperative programmer.




Answer: A

If no ignition occurs when starting a boiler which one would NOT be the possible cause?

If no ignition occurs when starting a boiler which one would NOT be the possible cause?

a. Lack of spark.
b. Insufficient pilot or low fire flame.
c. Spark but no flame.
d. Low fire switch open.
e. Timer switch in test position and timer stopped in prepurge.





Answer: B

If a blower does not start which one would NOT be the possible cause?

If a blower does not start which one would NOT be the possible cause?

a. Main disconnect switch open.
b. Blown fuses, tripped overloads, loose electrical connections.
c. Damper positioning switch in wrong
d. Combustion control safety lock-out switch tripped.
e. Limit control circuit not completed.





Answer: C

On a boiler with high-low fire control, if the damper positioning switch is in the wrong position

On a boiler with high-low fire control, if the damper positioning switch is in the wrong position

a) the damper motor may not operate
b) a pre-purge will not occur
c) a high fire main flame ignition could occur
d) nothing will happen when the manual start switch is closed
e) the pre-purge period will last indefinitely unless the problem is corrected





Answer: A

The second from last step in an automatic boiler programmed shutdown sequence is

The second from last step in an automatic boiler programmed shutdown sequence is

a) timer shutdown
b) main flame trial
c) post purge
d) operating control switch contacts closing
e) flame failure switch contacts opening





Answer: C

The operating pressure control will control the

The operating pressure control will control the

a) steam pressure in the boiler
b) gas pressure to the burner
c) water pressure to the boiler
d) boiler furnace pressure
e) steam pressure in the steam header






Answer: A

The function of a programming control is

The function of a programming control is

a) to supervise feedwater supply to the boiler
b) to regulate the fuel supply to the burner
c) to regulate combustion controls during start-up
d) control the boiler blowdown rate
e) to regulate fuel, air, and water supply to the boiler





Answer: C

Automatic boiler programming controls

Automatic boiler programming controls

a) must incorporate a modulating control system
b) do not require interlocking devices
c) require an ON-OFF or two-position control switch
d) cannot make use of high-low fire control
e) are not interconnected with the water level control system

Answer: C

When an automatic unattended boiler starts up, the program timer will first:

When an automatic unattended boiler starts up, the program timer will first:

a. Energize the ignition transformer and pilot gas solenoid valve
b. Start the post purge period
c. Start the forced draft fan
d. Energize the main gas valve
e. Energize the main feed water valve





Answer: C

The timer of a programmed combustion control consists of a motor and a:

The timer of a programmed combustion control consists of a motor and a:

a. Bellows
b. A nozzle and vane assembly
c. Number of cams and switches
d. Transmitter
e. Drive shaft






Answer: C

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:

a. An interlock, such as the combustion air proving switch, has failed
b. Main flame trial failure
c. Pilot flame trial failure
d. Igniter transformer failure
e. High steam pressure limit switch tripped

Answer: A

On a gas fired automatic boiler a normal programmed start-up takes approximately:

On a gas fired automatic boiler a normal programmed start-up takes approximately:

a. 105 seconds
b. 55 seconds
c. 27 - 40 seconds
d. 120 seconds
e. 70 seconds





Answer: A

If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur

If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur

a. If the trial for ignition period has lasted approximately 15 to 30 seconds
b. Immediately
c. Within 4 or 5 seconds
d. After the flame relay de-energizes
e. After the main burner flame ignites






Answer: A

After extinguishing the main flame, the next step in a programmed burner shutdown is

After extinguishing the main flame, the next step in a programmed burner shutdown is

a. The timer motor stops
b. The main flame trial ends
c. A post-purge begins.
d. Operation control switch contacts close
e. Flame failure switch contacts open







Answer: C

An interrupted pilot of an automatic boiler:

An interrupted pilot of an automatic boiler:

a. Burns continuously, like that in a home furnace
b. Ignites before the main burner ignites, and is extinguished when the main burner is extinguished
c. Is one that has been extinguished by an inadequate flame signal
d. Ignites, is proven stable and extinguishes after the main flame is established
e. Must be manually ignited





Answer: D

During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:

During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:

a. A boiler low water level
b. The main burner manual fuel valve is closed
c. The pilot manual fuel valve is closed
d. Boiler steam pressure operating control switch is open
e. The flame scanner is weak






Answer: C

Boiler furnaces are purged:

Boiler furnaces are purged:

a. So that the programmer has time to verify permissiveness
b. So that combustion gases are fully removed prior to ignition
c. So that the operator has time to check the fuel and water systems
d. So that combustibles are fully removed prior to ignition
e. To cool the hot refractory






Answer: D

If the pilot flame is adequate but the main burner fails to ignite, the programmer must:

If the pilot flame is adequate but the main burner fails to ignite, the programmer must:

a. Hold the program in its present state
b. Recycle the start-up sequence
c. Proceed to post purge and lockout while sounding an alarm.
d. Go directly to a lockout condition
e. Sound an alarm





Answer: C

The manual fuel shut-off valves of an automatic oil-fired boiler must be opened

The manual fuel shut-off valves of an automatic oil-fired boiler must be opened

a. Prior to pre-purging
b. After pre-purging and just prior to pilot ignition
c. Immediately after completion of the pilot flame trial
d. After the automatic main burner fuel valve opens
e. At the same time as the automatic main burner fuel valve





Answer: A

The programmer will go through a post purge:

The programmer will go through a post purge:

a. Only if pilot fails to ignite
b. Only on flame failure
c. By manually advancing the timer
d. On any type shutdown except, power outage
e. On routine shutdown only





Answer: D

During the start-up of a boiler equipped with an automatic control system and flame scanning device, the main burner safety shut-off valve:

During the start-up of a boiler equipped with an automatic control system and flame scanning device, the main burner safety shut-off valve:

a. Must be opened before the ignition transformer energizes
b. Can be opened before the flame scanner sees a flame
c. Can be opened any time during the start-up sequence
d. Should be opened as soon as the pilot valve opens
e. Must be closed before pilot ignition




Answer: E

With an automatic oil-fired boiler programmed control, a typical firing period begins approximately:

With an automatic oil-fired boiler programmed control, a typical firing period begins approximately:

a. 44 seconds after FD fan starts
b. 75 seconds after FD fan starts
c. 60 seconds after FD fan starts
d. 10 seconds after pilot extinguishes
e. 47 seconds after pre-purge




Answer: C

At the end of the pre-purge period, the combustion programmer:

At the end of the pre-purge period, the combustion programmer:

a. Shuts down
b. Opens the main fuel valve
c. Closes the pilot valve
d. Ends the ignition trial
e. Energizes the ignition transformer




Answer: E

On a steam boiler with single element feedwater control, the following item is measured:

On a steam boiler with single element feedwater control, the following item is measured:

a) steam flow
b) feedwater flow
c) boiler water level
d) fuel flow
e) feedwater pressure







Answer: C

In a two element feedwater control the following items are measured:

In a two element feedwater control the following items are measured:

a) boiler water level and steam flow
b) feedwater flow and steam flow
c) boiler water level and feedwater flow
d) boiler water level and fuel flow
e) temperature and volume of feedwater



Answer: A

A boiler control transfer or selector station

A boiler control transfer or selector station

a) can be used to manually override automatic control loops
b) can be changed from manual to automatic without balancing
c) is located upstream of the controller in a control loop
d) output is directed to the primary element of a loop
e) must be operated in manual mode for only short periods




Answer: A

With single element feedwater control the level transmitter output is

With single element feedwater control the level transmitter output is

a) received by a final element
b) proportional to drum level
c) sent to a selector station
d) constant regardless of level
e) a function of steam flow




Answer: B

Boiler modulating feedwater control flow rate depends on

Boiler modulating feedwater control flow rate depends on

a) level set point
b) control valve position
c) actual level
d) feedwater pressure
e) set point, level, and valve position





Answer: E

Which of the following is a flame sensing device?

Which of the following is a flame sensing device?

a) thermopile
b) heat sensing control
c) stack relay
d) cut-off valve
e) scanner





Answer: E

The function of a flame failure device is to

The function of a flame failure device is to

a) shut off the fuel supply when the pressure gets too high
b) shut off the fuel when the burner flame goes out
c) shut off the fuel when the fuel temperature is high
d) shut off the feedwater supply to the boiler
e) de-energize the fan and feedwater systems

Answer: B