Power Engineering 3B1 Chapter 5 Exam 2025 Questions and Answers

Power Engineering 3B1 Chapter 5
Exam 2025 Questions and Answers


The popping pressure of a safety valve must be:

a. Lower on the economizer than the main steam drum

b. Higher on the main steam drum than the air preheater

c. Lower on the main steam drum than the superheater

d. Higher on the main steam drum than on the superheater


e. the same on the main steam drum as on the superheater - CORRECT ANSWER✔️✔️-d


Safety valves should be opened manually to:

a. Release internal pressure

b. Remove sludge

c. Lower boiler water level

d. T est the operation of the valve


e. Test the low water fuel cut off - CORRECT ANSWER✔️✔️-d


Safety valves



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,Prevent loss of production in a plant

Prevent bursting of the boiler drum

Release steam to the atmosphere

Are not required on boilers

1,2,3,4,

1,2

2,3

3,4


1,3 - CORRECT ANSWER✔️✔️-c


To increase the popping pressure of a safety valve:

a. The adjusting ring is screwed upward

b. The adjusting screw is moved upward

c. The adjusting ring is screwed downward

d. The adjusting screw is moved downward


e. the spring is replaced - CORRECT ANSWER✔️✔️-d


To increase the blow down of a safety valve:

Increase the spring tension

Increase the port openings




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, Screw the adjusting ring upwards

Decrease the port opening

1,2

2,3

2,4

1,3


3,4 - CORRECT ANSWER✔️✔️-e


The purpose of the lip or feather on a safety valve seat:

Increases the force of steam acting on the seat

Allows the valve to pop open

Allows simpler construction of the valve

Makes no difference in operation

1,2,3,4

1,2

2,3

3,4


1,2,3 - CORRECT ANSWER✔️✔️-b


Safety valves:




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