Power Engineering 3B1 Chapter 5
Questions with Complete Solutions
(Latest 2025)
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 Answers ✅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 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
,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:
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 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
, 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
Questions with Complete Solutions
(Latest 2025)
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 Answers ✅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 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
,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:
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 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
, 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
