Power Engineering 4th Class unit B 2
chapter 2 Exam 2025 Questions and
Answers
If a stuffing box is to prevent the ingress of air, it is equipped with:
Choose one answer.
a. A vacuum breaker
b. A seal cage
c. A bushing
d. A thrust collar
e. An anti air siphon - Correct Answer✔️✔️-b
Pump priming is:
Choose one answer.
a. Done to centrifugal pumps with positive suction head
b. Done with the suction valve open
c. Filling the pump with gas
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,d. Done with the suction and discharge valve closed
e. When the pump is partially filled with vapour - Correct Answer✔️✔️-b
Proper priming and venting of a pump is important, especially if:
Choose one answer.
a. The medium being pumped is high temperature
b. The medium being pumped contains suspended solids
c. Oil or other low flash point lubricant is being pumped
d. A mechanical seal is used
e. The pump has a stuffing box and lantern ring - Correct Answer✔️✔️-d
New pump packing should be installed:
Choose one answer.
a. Tight enough to stop leakage
b. Loose enough to allow leakage for lubrication
c. Every shut down
d. Every year
e. Every time prior to start up - Correct Answer✔️✔️-b
Priming of a centrifugal pump refers to:
Choose one answer.
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, a. Removal of liquid from the pump
b. Filling the pump casing with liquid and removing the air
c. Lifting the pump
d. Closing the vent on the pump casing
e. Starting the pump driver - Correct Answer✔️✔️-b
Before you start up a centrifugal pump you should:
Choose one answer.
a. Blow off the liquid from the housing
b. Close the water to the lantern rings
c. Be sure that the pump is primed with liquid
d. Close the suction and discharge valves
e. Change the lube oil - Correct Answer✔️✔️-c
Strainers may be found:
Choose one answer.
a. On the suction side of the pump
b. On the discharge side of the pump
c. Inside the pump
d. On the air vent discharge of the pump
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
chapter 2 Exam 2025 Questions and
Answers
If a stuffing box is to prevent the ingress of air, it is equipped with:
Choose one answer.
a. A vacuum breaker
b. A seal cage
c. A bushing
d. A thrust collar
e. An anti air siphon - Correct Answer✔️✔️-b
Pump priming is:
Choose one answer.
a. Done to centrifugal pumps with positive suction head
b. Done with the suction valve open
c. Filling the pump with gas
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,d. Done with the suction and discharge valve closed
e. When the pump is partially filled with vapour - Correct Answer✔️✔️-b
Proper priming and venting of a pump is important, especially if:
Choose one answer.
a. The medium being pumped is high temperature
b. The medium being pumped contains suspended solids
c. Oil or other low flash point lubricant is being pumped
d. A mechanical seal is used
e. The pump has a stuffing box and lantern ring - Correct Answer✔️✔️-d
New pump packing should be installed:
Choose one answer.
a. Tight enough to stop leakage
b. Loose enough to allow leakage for lubrication
c. Every shut down
d. Every year
e. Every time prior to start up - Correct Answer✔️✔️-b
Priming of a centrifugal pump refers to:
Choose one answer.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, a. Removal of liquid from the pump
b. Filling the pump casing with liquid and removing the air
c. Lifting the pump
d. Closing the vent on the pump casing
e. Starting the pump driver - Correct Answer✔️✔️-b
Before you start up a centrifugal pump you should:
Choose one answer.
a. Blow off the liquid from the housing
b. Close the water to the lantern rings
c. Be sure that the pump is primed with liquid
d. Close the suction and discharge valves
e. Change the lube oil - Correct Answer✔️✔️-c
Strainers may be found:
Choose one answer.
a. On the suction side of the pump
b. On the discharge side of the pump
c. Inside the pump
d. On the air vent discharge of the pump
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
