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POWER ENGINEERING 4TH CLASS EXAM WITH
COMPLETE 1200 QUESTIONS AND WELL
ELABORATED ANSWERS JUST RELEASED THIS
YEAR
QUESTION: 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
QUESTION: 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
QUESTION: The lever handle of the shut-off cock between a pressure or
altitude gauge and a hot water boiler should be __________ to
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the pipe in which it is located when the cock is open.
a) perpendicular
b) parallel
c) adjacent
d) opposite
e) tangent - ANSWER✔✔b
QUESTION: 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
QUESTION: 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
QUESTION: Hot water heating boilers must be equipped with a
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a) thermometer
b) fusible plug
c) return trap
d) blow down tank
e) steam pressure gage - ANSWER✔✔a
QUESTION: 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
QUESTION: 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
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QUESTION: 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
QUESTION: 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
QUESTION: The most important rule in safe operation of a steam heating boiler is:
Choose one answer.
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
QUESTION: While warming up an additional hot water heating boiler in preparation to put into
service with other boilers, which of the following is true?
POWER ENGINEERING 4TH CLASS EXAM WITH
COMPLETE 1200 QUESTIONS AND WELL
ELABORATED ANSWERS JUST RELEASED THIS
YEAR
QUESTION: 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
QUESTION: 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
QUESTION: The lever handle of the shut-off cock between a pressure or
altitude gauge and a hot water boiler should be __________ to
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the pipe in which it is located when the cock is open.
a) perpendicular
b) parallel
c) adjacent
d) opposite
e) tangent - ANSWER✔✔b
QUESTION: 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
QUESTION: 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
QUESTION: Hot water heating boilers must be equipped with a
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a) thermometer
b) fusible plug
c) return trap
d) blow down tank
e) steam pressure gage - ANSWER✔✔a
QUESTION: 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
QUESTION: 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
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QUESTION: 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
QUESTION: 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
QUESTION: The most important rule in safe operation of a steam heating boiler is:
Choose one answer.
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
QUESTION: While warming up an additional hot water heating boiler in preparation to put into
service with other boilers, which of the following is true?
