Power Engineering 3B1 Chapter 5 Questions with Complete Solutions (Latest 2025)
The popping pressure of a safety valve must be:
- Lower on the economizer than the main steam drum
- Higher on the main steam drum than the air preheater
- Lower on the main steam drum than the superheater
- Higher on the main steam drum than on the superheater
- the same on the main steam drum as on the superheater -
Correct Answers ✅d
Safety valves should be opened manually to:
- Release internal pressure
- Remove sludge
- Lower boiler water level
- T est the operation of the valve
- Test the low water fuel cut off - Correct Answers ✅d
Safety valves 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 1 / 3
Power Engineering 3B1 Chapter 5 Questions with Complete Solutions (Latest 2025) 2,3 3,4 1,3 - Correct Answers ✅c
To increase the popping pressure of a safety valve:
- The adjusting ring is screwed upward
- The adjusting screw is moved upward
- The adjusting ring is screwed downward
- The adjusting screw is moved downward
- the spring is replaced - Correct Answers ✅d
To increase the blow down of a safety valve:
Increase the spring tension Increase the port openings Screw the adjusting ring upwards Decrease the port opening 1,2 2,3 2,4 1,3 3,4 - Correct Answers ✅e 2 / 3
Power Engineering 3B1 Chapter 5 Questions with Complete Solutions (Latest 2025)
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 Answers ✅b
Safety valves:
Shall be attached as close as possible to the boiler drum Shall be attached in an upright position with the spindle vertical Shall have a discharge line attached Shall have no valve placed between the boiler and the safety valve
1,2,3,4
1,2,3 1,2,4 2,3,4
- / 3