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