Power Engineering 4th Class
unit B 3 chapter 5 questions
and answers
A hot water boiler operating control can be a pressure switch:
Choose one answer.
a. That is normally open
b. That is sensitive to the expansion and contraction of boiler water
c. Utilizing a closed liquid filled system
d. That is sensitive to system steam pressure
e. That is sensitive to boiler steam pressure - answer c
The type of combustion control frequently used on a small packaged
boiler is
Choose one answer.
a. a semi-automatic control
b. a modulating control
c. a proportional control
d. a constant pressure control
e. an on-off control - answer e
A modulating control steam heating boiler:
Choose one answer.
a. Is always fully automatic
b. Will have a narrow operating pressure range
c. Maintains a steady boiler pressure
d. Will have a constant combustion air, flow rate
, e. Cannot be adjusted - answer c
Prior to a boiler safety valve popping during routine boiler
operation:
Choose one answer.
a. A try lever test should be performed
b. The pressure gage should be checked
c. The high limit switch should open
d. The feedwater pump should stop
e. The high level alarm should sound - answer c
An operating control switch for an ON-OFF boiler:
Choose one answer.
a. Uses a differential spring to reduce cycling
b. Can only have its cut-in setting adjusted
c. Has an un-adjustable span between cut-in and cut-out
d. Utilizes a resistance coil
e. Operates in conjunction with a Modutrol motor - answer a
The most important fitting installed between the operating switch of
a steam boiler and the boiler itself is a
Choose one answer.
a. Tee with a plug
b. Syphon
c. Blowdown valve
d. Test connection for an inspector
e. Pressure gage - answer b
On a cluster burner, the high fire nozzle will:
unit B 3 chapter 5 questions
and answers
A hot water boiler operating control can be a pressure switch:
Choose one answer.
a. That is normally open
b. That is sensitive to the expansion and contraction of boiler water
c. Utilizing a closed liquid filled system
d. That is sensitive to system steam pressure
e. That is sensitive to boiler steam pressure - answer c
The type of combustion control frequently used on a small packaged
boiler is
Choose one answer.
a. a semi-automatic control
b. a modulating control
c. a proportional control
d. a constant pressure control
e. an on-off control - answer e
A modulating control steam heating boiler:
Choose one answer.
a. Is always fully automatic
b. Will have a narrow operating pressure range
c. Maintains a steady boiler pressure
d. Will have a constant combustion air, flow rate
, e. Cannot be adjusted - answer c
Prior to a boiler safety valve popping during routine boiler
operation:
Choose one answer.
a. A try lever test should be performed
b. The pressure gage should be checked
c. The high limit switch should open
d. The feedwater pump should stop
e. The high level alarm should sound - answer c
An operating control switch for an ON-OFF boiler:
Choose one answer.
a. Uses a differential spring to reduce cycling
b. Can only have its cut-in setting adjusted
c. Has an un-adjustable span between cut-in and cut-out
d. Utilizes a resistance coil
e. Operates in conjunction with a Modutrol motor - answer a
The most important fitting installed between the operating switch of
a steam boiler and the boiler itself is a
Choose one answer.
a. Tee with a plug
b. Syphon
c. Blowdown valve
d. Test connection for an inspector
e. Pressure gage - answer b
On a cluster burner, the high fire nozzle will:
