Power Engineering 5th Class QNS
A closed expansion tank is often equipped with:
Choose one answer.
a. A gauge glass
b. A pressure relief valve
c. An automatic fill valve
d. A circulating pump
e. A thermometer - ANS - a
A closed type expansion tank in a hot water heating system must:
Choose one answer.
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 - ANS - e
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 - ANS - e
A pressure or altitude gauge for a hot water heating boiler:
Choose one answer.
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 - ANS - c
An agency or code with which fittings must comply is:
Choose one answer.
a. Health and Safety Code
, b. Fittings and Boiler Parts Act
c. Boiler Repair Code
d. Plumbing Gas Act
e. ASME Code - ANS - e
An altitude gauge on a hot water heating boiler is used to indicate:
Choose one answer.
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 - ANS - d
An automatic fill valve for a hot water boiler:
Choose one answer.
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 - ANS - c
An expansion tank is used to:
Choose one answer.
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 - ANS - c
Boiler stop valves shall be:
Choose one answer.
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 - ANS - c
During warm-up of a cold hot water boiler excessive pressure
build-up is prevented by
A closed expansion tank is often equipped with:
Choose one answer.
a. A gauge glass
b. A pressure relief valve
c. An automatic fill valve
d. A circulating pump
e. A thermometer - ANS - a
A closed type expansion tank in a hot water heating system must:
Choose one answer.
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 - ANS - e
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 - ANS - e
A pressure or altitude gauge for a hot water heating boiler:
Choose one answer.
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 - ANS - c
An agency or code with which fittings must comply is:
Choose one answer.
a. Health and Safety Code
, b. Fittings and Boiler Parts Act
c. Boiler Repair Code
d. Plumbing Gas Act
e. ASME Code - ANS - e
An altitude gauge on a hot water heating boiler is used to indicate:
Choose one answer.
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 - ANS - d
An automatic fill valve for a hot water boiler:
Choose one answer.
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 - ANS - c
An expansion tank is used to:
Choose one answer.
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 - ANS - c
Boiler stop valves shall be:
Choose one answer.
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 - ANS - c
During warm-up of a cold hot water boiler excessive pressure
build-up is prevented by
