Power Engineering 4th Class unit B 3 chapter 5 Exam 2025 Questions and Answers

Power Engineering 4th Class unit B 3
chapter 5 Exam 2025 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 - CORRECT 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


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, d. a constant pressure control


e. an on-off control - CORRECT 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 - CORRECT 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 - CORRECT ANSWER✔️✔️-c


An operating control switch for an ON-OFF boiler:

Choose one answer.




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