Sharing and transferring information between computers is termed:

Sharing and transferring information between computers is termed:

a) Plotting
b) Networking
c) Number crunching
d) Multiplexing
e) Analogging


Answer: B

The piping generally used for a hot oil system is:

The piping generally used for a hot oil system is:

a) austenitic steel
b) stainless steel
c) copper alloy
d) cast iron
e) carbon steel


Answer: E

Whenever feasibly possible, when checking bearings on running pieces of equipment it is wise to:

Whenever feasibly possible, when checking bearings on running pieces of equipment it is wise to:

a) Check the oil quantity leaving each
b) Observe the temperature on a thermometer
c) Smell the normal odors of the running bearing
d) Check the oil quality leaving each
e) Get accustomed to normal running temperature and vibration by feel


Answer: E

Lead sulfide cells operate when __________ is present:

Lead sulfide cells operate when __________ is present:

a) flue gas
b) ultra-violet light
c) infrared
d) no light
e) heat


Answer: C

One of the following is not a centrifugal fan

One of the following is not a centrifugal fan

a) the propeller fan
b) backward inclined fan wheel
c) backward inclined airfoil blade fan
d) forward curved fan wheel
e) radial blade fan


Answer: A

A gas fired hot oil heater has skin thermocouples to measure outside tube temperature. A gradual increase in temperature on all thermocouples is an indication of:

A gas fired hot oil heater has skin thermocouples to measure outside tube temperature. A gradual increase in temperature on all thermocouples is an indication of:

a) soot on the tubes
b) the tubes coking off
c) not enough excess air
d) a decrease in oil flow
e) faulty thermocouples


Answer: B

The top of a rung ladder should extend approximately _________ above the level of the upper landing to which it provides access.

The top of a rung ladder should extend approximately _________ above the level of the upper landing to which it provides access.

a) 0.2 metres
b) 2 metres
c) 0.5 metres
d) 0.3 metres
e) 1 metres


Answer: E

A forced hot water circulating system can be classified as the following type:

A forced hot water circulating system can be classified as the following type:

a) loop system
b) one pipe system
c) two pipe direct return system
d) two pipe reverse return system
e) all of the above


Answer: E

Stripping steam in a refinery

Stripping steam in a refinery

a) is directly injected in a tower to remove a light product
b) is low pressure steam from a waste heat boiler
c) is used for heat tracing
d) is steam generated from process water
e) is used in an exchanger to heat a process for distillation


Answer: A

It is generally accurate to say that:

It is generally accurate to say that:

a) A water height or depth of 10.34 meters results in 1 kPa
b) 10.21 kPa will result from 1 meter of static water head
c) 1 kPa will result from a water head of 9.8 meters
d) Atmospheric pressure has no bearing on static water head
e) 9.8 kPa pressure results from every meter of water depth or height


Answer: E

A new boiler should be flushed and internally inspected after _________ months of operation:

A new boiler should be flushed and internally inspected after _________ months of operation:

a) one
b) twelve
c) three
d) six
e) two


Answer: C

When shutting down a boiler for internal cleaning, you should:

When shutting down a boiler for internal cleaning, you should:

a) let it stand for a couple days then drain
b) shut off fire, drain, open up and flush
c) shut down the boiler then fill the boiler completely with chemically treated water
d) allow it to cool, then drain, open up and flush
e) shut off fire and flush with cold water to cool it down


Answer: D

The Hartford Loop prevents the water in the boiler from:

The Hartford Loop prevents the water in the boiler from:

a) exceeding the highest safe level
b) dropping below a safe level
c) flowing out through the steam main
d) exceeding the maximum temperature
e) contamination by impurities in the returning condensate


Answer: B

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 main gas valve
b) start the force draft fan
c) energize the ignition transformer and pilot gas solenoid valve
d) energize the main feed water valve
e) start the post purge period


Answer: B

A common lifting device used in a plant is a block and tackle; a block and tackle is a combination of:

A common lifting device used in a plant is a block and tackle; a block and tackle is a combination of:

a) chains & come-along
b) ropes & pulleys
c) eye bolts & wire rope
d) slings & rigging
e) hooks & shackles


Answer: B

A heat recovery system which employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm thick and 1 to 3.7 m in diameter is called a:

A heat recovery system which employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm thick and 1 to 3.7 m in diameter is called a:

a) heat valve
b) heat pump
c) runaround system
d) heat pipe
e) thermal wheel


Answer: E

The output pressure signal of a transmitter relay is usually:

The output pressure signal of a transmitter relay is usually:

a) fed to a final element of a loop
b) direct and proportional to nozzle pressure
c) inversely proportional to nozzle pressure
d) a function of supply pressure
e) the same as the primary element output signal


Answer: B

A steam heating boiler that is to be shut down for six months during the summer, should be

A steam heating boiler that is to be shut down for six months during the summer, should be

a) left with the water at normal working level and pressurized with air to 50 kPa
b) drained, thoroughly dried out, quick lime placed inside and closed up
c) A completely water filled boiler with the vent open to atmosphere
d) drained, thoroughly dried out, quick lime placed inside and left open
e) left with the water at normal working level but opened up to atmosphere


Answer: B

An upset in a plant process is called a/an:

An upset in a plant process is called a/an:

a) disturbance
b) agitation
c) perturbation
d) malfunction
e) disorder


Answer: A

The average amount of water volume which evaporates from a cooling tower is:

The average amount of water volume which evaporates from a cooling tower is:

a) 10 %
b) 2 %
c) 3.5 %
d) 5 %
e) 15 %


Answer: D

The shrouding installed on the blading of a steam turbine serves to:

The shrouding installed on the blading of a steam turbine serves to:

a) stop the steam flow
b) expand the steam
c) heat the steam
d) confine the steam to the blades
e) cool the blade tips


Answer: D

The voltage drop across a 20 ohm resistor with 10 amps flowing would be:

The voltage drop across a 20 ohm resistor with 10 amps flowing would be:

a) 150
b) 0.5
c) 2
d) 20
e) 200


Answer: E

The breaking down on long chain hydrocarbon molecules to smaller more valuable ones is called:

The breaking down on long chain hydrocarbon molecules to smaller more valuable ones is called:

a) hydro treating
b) cracking
c) stabilization
d) thermal degradation
e) dehydration


Answer: B

In order to convert velocity pressure to static pressure in an air distribution system, it is necessary to

In order to convert velocity pressure to static pressure in an air distribution system, it is necessary to

a) decrease the cross-sectional area of the duct
b) increase the fan speed
c) use a valve to change the pressure
d) decrease the fan speed
e) increase the cross-sectional area of the duct


Answer: E

A hot oil system uses a ______________________ fluid in place of steam or water, to conduct heat from a central source to other vessels and heating coils in a plant.

A hot oil system uses a ______________________ fluid in place of steam or water, to conduct heat from a central source to other vessels and heating coils in a plant.

a) refrigerant
b) cooling
c) heating
d) condensing
e) thermal


Answer: E

This type of fan drive system is normally used on systems where the resistance can be determined accurately.

This type of fan drive system is normally used on systems where the resistance can be determined accurately.

a) fluid drive
b) variable speed motor control
c) v-belt drive
d) variable inlet van control
e) direct drive


Answer: E

A residential forced air system:

A residential forced air system:

a) is restricted to buildings of less than 180 square metres
b) is usually fitted with a hot air duct, a cold air duct, and a return air duct
c) is able to provide individual room temperature control
d) can use low velocity ducting to increase temperature control
e) is single zone in operation and control


Answer: E

Which of the following statements is true regarding a heating coil fitted with face and bypass dampers?

Which of the following statements is true regarding a heating coil fitted with face and bypass dampers?

a) temperature control is achieved by the use of the steam or hot water valve
b) the face and bypass dampers are two position dampers
c) the steam supply to the coil is controlled by the outside air thermostat
d) the coil temperature is held constant
e) when the bypass damper is open, steam supply is shut off


Answer: D

Which of the following is not a component of a runaround heat recovery system?

Which of the following is not a component of a runaround heat recovery system?

a) a recovery coil
b) a thermal wheel
c) a pre-conditioning coil
d) a pump
e) an expansion tank


Answer: B

A typical hot oil circulating pump would be:

A typical hot oil circulating pump would be:

a) a reciprocating pump
b) a lobe pump
c) a sliding vane pump
d) a diaphragm pump
e) a centrifugal pump


Answer: E

The type of material used for kitchen exhaust ducts are made of _________.

The type of material used for kitchen exhaust ducts are made of _________.

a) fiberglass
b) cement asbestos
c) galvanized steel
d) heavy gauge black steel
e) copper


Answer: D

One of the best ways to achieve volume control in an air system, from a sound level standpoint, is the __________.

One of the best ways to achieve volume control in an air system, from a sound level standpoint, is the __________.

a) outlet damper control
b) variable speed motor control
c) fluid drive
d) direct drive
e) variable inlet vane control


Answer: B

What is the name of the air conditioning system that has all the major equipment located in one mechanical room?

What is the name of the air conditioning system that has all the major equipment located in one mechanical room?

a) packaged system
b) central system
c) combined system
d) multi-zone system
e) dual duct system


Answer: B

Glycol coils using ethylene glycol:

Glycol coils using ethylene glycol:

a) give reasonable heat transfer efficiency at low glycol velocity
b) are not recommended for use in heating and air conditioning systems in the food industry
c) use direct fired boilers as their heat source
d) do not use steam-glycol converters as their heat source
e) are used only for heating purposes and are not used for cooling purposes


Answer: B

How many compartments are window air conditioners divided into?

How many compartments are window air conditioners divided into?

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


Answer: B

A fan is referred to as non-overloading when

A fan is referred to as non-overloading when

a) the free air delivery is at minimum
b) the static pressure remains low
c) velocity pressure is at maximum
d) the power curve falls at free air delivery
e) the static efficiency is low


Answer: D

Air is made up of approximately:

Air is made up of approximately:

a) 79 % N2 and 21% CO2
b) 79 % O2 and 21 % N2
c) 79 % N2 and 21 % O2
d) 79 % CO2 and 21 % O2
e) 79 % H2 and 21 % H2O vapour


Answer: C

or what chief purpose is the ground wood pulp, which is produced by the mechanical process, used:

or what chief purpose is the ground wood pulp, which is produced by the mechanical process, used:

a) cardboard
b) soft paper products
c) blending with wood chips
d) stationery products
e) newsprint


Answer: E

A high pressure duct system operates at _____

A high pressure duct system operates at _____

a) static pressure above 0.50 kPa
b) static pressure less than 0.50 kPa
c) static pressure up to 1.50 kPa
d) velocities between 11 m/s to 25 m/s
e) velocities greater than 25 m/s


Answer: E

The condenser section of a window air conditioner:

The condenser section of a window air conditioner:

a) is larger than the supply plenum
b) is exposed to outside air
c) has an automatically controlled damper to vary the amount of outside air introduced into the room
d) has a water cooling arrangement
e) has heat recovery section for maximum efficiency


Answer: B

Which type of coil circuiting is designed to produce a high heat capacity with a limited water quantity?

Which type of coil circuiting is designed to produce a high heat capacity with a limited water quantity?

a) single serpentine
b) double serpentine
c) half serpentine
d) face velocity
e) steam coil


Answer: C

What is one method of preventing ice build-up on the recovery coil of a runaround heat recovery system during cold weather?

What is one method of preventing ice build-up on the recovery coil of a runaround heat recovery system during cold weather?

a) by using electric heating elements on the coil
b) by the use of a pre-heat coil
c) by using a steam to glycol heat exchanger
d) by using a three-way mixing valve to mix cold and warm glycol
e) by throttling the air inlet dampers to restrict the airflow


Answer: D

Which of the following is a hand tool?

Which of the following is a hand tool?

a) electric drill
b) steel tape
c) micrometer
d) hammer
e) compound grinder


Answer: D

Air venting, in an air conditioning system, is required for which of the following reasons?

Air venting, in an air conditioning system, is required for which of the following reasons?

a) to assure adequate water distribution in the coils and supply/return lines
b) to assure adequate air distribution in supply lines
c) to assure adequate air distribution in return lines
d) to maintain face velocity
e) all of the above


Answer: A

The most likely cause of a fire in a hot oil system is:

The most likely cause of a fire in a hot oil system is:

a) pump seal leak
b) exchanger leak
c) wrong gasket material
d) furnace tube rupture
e) failure of the blanket gas system


Answer: D

Depending on the workmanship, air leakages from ducts can vary by __________.

Depending on the workmanship, air leakages from ducts can vary by __________.

a) 1% to 5 %
b) 3% to 5 %
c) 5% to 10 %
d) 5% to 30 %
e) 10% to 40 %


Answer: D

Identify, from the list below, the combined psychrometric processes:

Identify, from the list below, the combined psychrometric processes:

1. heating and humidification
2. cooling and humidification
3. cooling and dehumidification
4. mixtures of air


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


Answer: E

The main cause(s) of furnace explosions in black liquor recovery boilers is(are):

The main cause(s) of furnace explosions in black liquor recovery boilers is(are):

a) black liquor with a low solids content
b) faulty air supply
c) smelt-water explosions
d) operator error
e) a & c


Answer: E

In a Variable Air Volume (with perimeter heat) combined air conditioning system, where are the VAV boxes located

In a Variable Air Volume (with perimeter heat) combined air conditioning system, where are the VAV boxes located

a) in the main ductwork
b) in each diffuser
c) in the exterior zones
d) at the air handling unit discharge
e) in the branch ducting


Answer: E

One of the best methods to reduce power consumption of a fan motor is the __________.

One of the best methods to reduce power consumption of a fan motor is the __________.

a) fluid drive
b) variable speed motor control
c) outlet damper control
d) variable inlet vane control
e) v-belt drive


Answer: B

In an air conditioning system that uses static pressure regulation to control volume flow, what happens when the differential pressure controller senses a rise in duct pressure?

In an air conditioning system that uses static pressure regulation to control volume flow, what happens when the differential pressure controller senses a rise in duct pressure?

a) the zone temperatures rise
b) velocities in the duct decrease
c) the zone dampers throttle in
d) the static pressure damper is throttled
e) the fan motor speeds up


Answer: D

In a Variable Air Volume (with perimeter heating) combined air conditioning system, how are the VAV boxes controlled?

In a Variable Air Volume (with perimeter heating) combined air conditioning system, how are the VAV boxes controlled?

a) by a flow meter in the fan discharge
b) by the return air temperature
c) by the outside air temperature
d) by the supply fan volume control
e) by the room thermostat


Answer: E

Disadvantages of a thermal wheel heat recovery include:

Disadvantages of a thermal wheel heat recovery include: 

1. a large space is required
2. perfect sealing is impossible
3. the ducts must be side-by-side
4. the recovery rate is relatively low


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


Answer: C

Belt guards are required on _________

Belt guards are required on _________

a) variable speed motor controls
b) v-belt drives
c) direct drives
d) outlet damper controls
e) fluid drives


Answer: B

Relative humidity in the air:

Relative humidity in the air:

a) increases when the air temperature decreases
b) increases when the air pressure decreases
c) decreases when the air pressure increases
d) decreases when the air temperature decreases
e) remains constant with air temperature changes


Answer: A

This type of unitary air conditioning system has two compartments, a supply plenum and a condenser compartment.

This type of unitary air conditioning system has two compartments, a supply plenum and a condenser compartment.

a) a window air conditioner
b) a packaged air conditioner
c) a unit ventilator
d) a rooftop unit
e) a combined air conditioner


Answer: A

What functions do the mixing boxes in a dual duct air conditioning system perform?

What functions do the mixing boxes in a dual duct air conditioning system perform? 

1. humidification
2. blending air temperatures
3. maintain constant air flow
4. filtration


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


Answer: B

The main function of air distribution devices is to introduce supply air into the conditioned space. This is accomplished by using which of the following methods.

The main function of air distribution devices is to introduce supply air into the conditioned space. This is accomplished by using which of the following methods.

1. diffusion
2. induction
3. entrainment
4. aspiration


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


Answer: A

The main advantages of a low pressure duct system is the:

The main advantages of a low pressure duct system is the:

a) relative quietness of the air movement
b) higher operating costs
c) special control devices
d) noise suppression devices required
e) careful fabrication and installation of the ductwork


Answer: A

To calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by:

To calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by:

a) 0.4
b) 0.8
c) 1.1
d) 1.2
e) 2.1


Answer: D

When does the capacity of a heat pipe decrease to zero?

When does the capacity of a heat pipe decrease to zero?

a) at minus 10oC
b) when the RH approaches 0%
c) when the effects of gravity overcome the effects of the capillary action
d) when the temperature differential is greater than 10oC
e) when the vapour pressure in the heat tube is less than atmospheric vapour pressure


Answer: C

"Slips and locks" refers to _________

"Slips and locks" refers to _________

a) a means of isolating motors
b) special seams used to fasten ducts together
c) a system to prevent injuries
d) a way to block a doorway
e) a type of chain used in industry

Answer: B

Heat gains from the sun change and depend on:

Heat gains from the sun change and depend on:

1. The type of house
2. The latitude
3. The season
4. The time of day



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


Answer: D

How is dehumidification in a large air conditioning system achieved?

How is dehumidification in a large air conditioning system achieved?

a) by the use of adsorbents
b) by the use of absorbents
c) by the use of steam grid dehumidifiers
d) by cooling the air to its dewpoint
e) by the use of activated charcoal


Answer: D

This type of combined air conditioning system uses a central makeup unit, high velocity ducting, a sound absorber, and individual room units

This type of combined air conditioning system uses a central makeup unit, high velocity ducting, a sound absorber, and individual room units

a) hydronic heat pump system
b) constant air volume system with perimeter heating
c) fan-coil units with makeup air
d) induction system
e) variable air volume with perimeter heating


Answer: D

What is the difference between "thermal conductance" and "thermal conductivity"?

What is the difference between "thermal conductance" and "thermal conductivity"?

a) Thermal conductance deals with a composite material. Thermal conductivity deals with a uniform type or material
b) Thermal conductivity uses SI units; thermal conductance uses Imperial units.
c) Thermal conductivity deals with heat given off by a single electrical device. Thermal conductance deals with the heat given off by all electrical devices in a building.
d) There is no difference.
e) Thermal conductivity deals with heat gain. Thermal conductance deals with heat loss.


Answer: A

A ductwork operating at less than 10 m/s is said to be a _________duct system.

A ductwork operating at less than 10 m/s is said to be a _________duct system.

a) high velocity
b) medium pressure
c) medium velocity
d) low pressure
e) high pressure


Answer: D

Inlet steam pressure to a heating coil should not be less than what pressure?

Inlet steam pressure to a heating coil should not be less than what pressure?

a) 5 kPa
b) 34 kPa
c) 16 kPa
d) 42 kPa
e) 50% of control valve discharge pressure


Answer: B

What is the Coefficient of Performance of a heat pump which uses 4 kW of energy to produce 10 kW of heating capacity?

What is the Coefficient of Performance of a heat pump which uses 4 kW of energy to produce 10 kW of heating capacity?

a) 40
b) 0.4
c) 5 kW
d) 2.5
e) 0.4 kW


Answer: D

How is the electric heating element in an industrial pan type humidifier protected from overheating?

How is the electric heating element in an industrial pan type humidifier protected from overheating?

a) by a minimum flow switch
b) by a low water cutoff switch
c) by a thermal resistive switch
d) by an overpressure limit switch
e) by a cooling spray


Answer: B

Which is not an advantage of a thermal wheel recovery system?

Which is not an advantage of a thermal wheel recovery system?

a) pump, liquid, and piping is not required
b) only a small motor is required
c) good recovery of both latent and sensible heat
d) it is easy to retrofit into a system
e) a wide recovery temperature range is possible


Answer: D

What is the temperature of the cold deck supply air in both multi-zone and dual duct air conditioning systems?

What is the temperature of the cold deck supply air in both multi-zone and dual duct air conditioning systems?

a) 5ºC
b) 8.7ºC
c) 12.5ºC
d) 14.4ºC
e) 17ºC


Answer: C

When talking about heating or cooling coils, face velocity is the:

When talking about heating or cooling coils, face velocity is the:

a) velocity of the supply water to the coil
b) velocity of the air before it enters the coil
c) velocity of the air after it leaves the coil
d) average velocity of the air flowing over the face area of the fin surface
e) velocity of the return water from the coil


Answer: D

Installation of a thermal wheel requires:

Installation of a thermal wheel requires:

a) minimal space
b) that the ducts be adjacent and parallel
c) pre-conditioning cols in addition to the thermal wheel itself
d) louvers or deflectors to prevent carry-over
e) a pump, piping and a circulating fluid


Answer: B

When taking wire rope off a spool the spool should always be rotated, removing the rope from the side may result in:

When taking wire rope off a spool the spool should always be rotated, removing the rope from the side may result in:

a) knotting
b) kinking
c) friction
d) braiding
e) hoisting


Answer: B

A hydrostatic test should be applied to a boiler:

A hydrostatic test should be applied to a boiler:

a) at the request of the boiler inspector
b) once per year
c) once per week
d) every shift
e) at the request of the owner only


Answer: A

The combined psychrometric process of cooling and humidification is also known as _________.

The combined psychrometric process of cooling and humidification is also known as _________.

a) enthalpy cooling
b) relative humidification
c) evaporative cooling
d) effective temperature humidification
e) humidification


Answer: C

What does it mean when it is said that the air temperature in an air conditioning system has been "tempered"?

What does it mean when it is said that the air temperature in an air conditioning system has been "tempered"?

a) the temperature has been raised
b) the temperature has been lowered
c) the temperature has been adjusted to within the required range by the addition of heat or cold
d) the air temperature has been adjusted so as to approach its dew point
e) the temperature has been held at the desired level in all possible conditions


Answer: C

Why infiltration shouldn't be depended on to supply a building's ventilation requirements?

Why infiltration shouldn't be depended on to supply a building's ventilation requirements?

a) Infiltration can cause a negative pressure in the building
b) Infiltration causes condensation problems
c) Infiltration fans require large amounts of power
d) Infiltration can only be controlled by complicated dampers and louvres
e) Infiltration can drop to zero if there is no wind


Answer: E

When there is the possibility of freezing temperatures, what type of liquid is used in a runaround type heat recovery system?

When there is the possibility of freezing temperatures, what type of liquid is used in a runaround type heat recovery system?

a) steam
b) water
c) mineral oil
d) ethylene glycol
e) silicone thermal fluid


Answer: D

Which of the following statements is accurate?

Which of the following statements is accurate? 

1. Heat loss by infiltration is proportional to wind speed
2. Increasing the layers of glass in windows decreases losses
3. Proper ventilation requirements are determined by the air change method
4. Cold outer walls radiate this cold to interior objects


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


Answer: E

Ammonia is removed from a hydrotreater by washing the oil with _________.

Ammonia is removed from a hydrotreater by washing the oil with _________.

a) amine
b) naphtha
c) Water
d) steam
e) hydrazine


Answer: C

When used on a heat pipe heat recovery system, face and bypass damper control can be used to do which of the following?

When used on a heat pipe heat recovery system, face and bypass damper control can be used to do which of the following? 

1. prevent frost formation
2. limit heat recovery
3. dehumidify
4. provide low start up load


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


Answer: A

In regards to ductwork, what must be provided at the fan discharge or suction openings?

In regards to ductwork, what must be provided at the fan discharge or suction openings?

a) neoprene valves
b) canvas louvres
c) cushion heads
d) diffusers take-off
e) flexible connectors


Answer: E

What type of unitary air conditioning system do the following statements describe?

What type of unitary air conditioning system do the following statements describe? 

1) it may be installed in a false ceiling
2) it has a direct expansion coil
3) it may be fitted with auxiliary heating coils
4) single zone in operation


a) window air conditioner
b) packaged air conditioner
c) unit ventilator
d) rooftop unit
e) combined unit


Answer: B

When sub-zero weather is encountered, what limits the efficiency of a runaround heat recovery system?

When sub-zero weather is encountered, what limits the efficiency of a runaround heat recovery system?

a) higher viscosity of the fluid increases pump power demand
b) the temperature differential between inlet and exhaust isn't sufficient
c) fluid flow through the coils must be throttled during cold weather therefore heat recovery is minimal
d) in sub-zero temperatures, heat is not recoverable
e) frost build-up on the recovery coil restricts airflow over the coil


Answer: E

Fiberglass ducts are used

Fiberglass ducts are used

a) in high pressure systems
b) to handle air with high moisture level or oil and grease
c) where its heavy weight is not a problem
d) where high strength is required
e) in some low pressure systems


Answer: E

What can be used to prevent wide temperature swings in an air conditioned space when using a direct expansion heat exchanger and on/off control?

What can be used to prevent wide temperature swings in an air conditioned space when using a direct expansion heat exchanger and on/off control?

a) bypass dampers
b) tempering steam
c) heating elements
d) two position thermostats
e) a thermostatic expansion valve


Answer: E

The purpose of the naphtha hydrotreater in an oil refinery is:

The purpose of the naphtha hydrotreater in an oil refinery is:

a) to remove the hydrogen sulphide and nitrogen from the diesel
b) to remove the sulphur and nitrogen compounds from the naphtha
c) to cause the heavy hydrocarbons to be transformed into lighter hydrocarbons
d) to remove the diesel from the naphtha
e) to remove the water from the crude oil


Answer: B

Paper is produced from which of the following constituents of trees:

Paper is produced from which of the following constituents of trees:

a) cellulose
b) lignin
c) hemicelluloses
d) pectin's
e) pentosans


Answer: A

The vane axial flow fan

The vane axial flow fan

a) has a more spiral air flow that tube axial fan
b) has a more turbulent air flow than the tube axial fan
c) has a lower efficiency than the tube axial fan
d) has a less spiral air flow, less friction, and better efficiency than the tube axial fan
e) is not suitable for duct mounting


Answer: D

When using a steam humidifier, what steam pressure should be used?

When using a steam humidifier, what steam pressure should be used?

a) 5 - 10 kPa
b) 20 - 40 kPa
c) 35 - 70 kPa
d) 100 - 120 kPa
e) 150 - 200 kPa


Answer: C

For cooling purposes, the mixed air temperature of an air handling unit is set to maintain what temperature?

For cooling purposes, the mixed air temperature of an air handling unit is set to maintain what temperature?

a) 5ºC
b) 7.5ºC
c) 10.5ºC
d) 12.5ºC
e) 15ºC


Answer: D

When shutting down a hot oil system, the oil is circulated in order to prevent:

When shutting down a hot oil system, the oil is circulated in order to prevent:

a) uneven cooling of oil
b) oil viscosity becoming too low
c) over pressurization of the heater
d) oil deterioration due to thermal cracking
e) hot spots from forming


Answer: E

One of the most expensive methods of volume control for an air system is the __________.

One of the most expensive methods of volume control for an air system is the __________.

a) direct drive
b) v-belt drive
c) variable inlet vane control
d) outlet damper control
e) variable speed motor control


Answer: E

If a steam heating coil control valve were properly selected, what would the outlet pressure from the valve be if the inlet pressure was 150 kPa?

If a steam heating coil control valve were properly selected, what would the outlet pressure from the valve be if the inlet pressure was 150 kPa?

a) 150 kPa
b) 120 kPa
c) 100 kPa
d) 75 kPa
e) 50 kPa


Answer: D

In an induction type combined air conditioning system, what causes the primary air to mix with the secondary air and circulate throughout the room?

In an induction type combined air conditioning system, what causes the primary air to mix with the secondary air and circulate throughout the room?

a) a mixing fan
b) high velocity louvres
c) mixing vanes
d) movement of primary air through a nozzles
e) distribution boxes


Answer: D