Power Engineering 4th Class unit B 2
chapter 1 Exam 2025 Questions and
Answers
A centrifugal pump consists of:
Choose one answer.
a. An impeller surrounded by a casing
b. A piston moving back and forth in a cylinder
c. Gears rotating in a housing
d. Sliding vanes
e. A pulsating disc - CORRECT ANSWER✔️✔️-a
A volute type pump:
Choose one answer.
a. Is a positive displacement pump
b. Has a progressively expanding spiral casing
c. Reduces the velocity in the discharge nozzle
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,d. Is more costly than diffuser pumps
e. Is a regenerative type pump - CORRECT ANSWER✔️✔️-b
A multi-stage pump would be used when:
Choose one answer.
a. The lift is great
b. A greater volume must be pumped
c. The head is great
d. The temperature of the liquid is high
e. There is sufficient floor space - CORRECT ANSWER✔️✔️-c
A rotary pump:
Choose one answer.
a. Is silent in operation
b. Has severe discharge pulsations
c. Should be equipped with a relief valve
d. Is a dynamic pump
e. Has very poor suction lift - CORRECT ANSWER✔️✔️-c
The capacity of a centrifugal pump should only be reduced by:
Choose one answer.
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, a. Throttling the suction valve
b. Closing the suction valve
c. Closing both suction and discharge valves
d. Opening the pump casing vent valve
e. Throttling the discharge valve - CORRECT ANSWER✔️✔️-e
When starting up a rotary pump you must be sure that the:
Choose one answer.
a. Discharge valve is closed
b. Discharge valve is open
c. Pump is filled with air
d. Pump is at the correct temperature
e. Pump suction valve is closed - CORRECT ANSWER✔️✔️-b
The capacity of a centrifugal pump:
Choose one answer.
a. Varies with discharge pressure
b. Is fixed and can only be altered by changing the impeller
c. Indicates that the unit is a positive displacement type
d. Should be varied by suction valve manipulation
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
chapter 1 Exam 2025 Questions and
Answers
A centrifugal pump consists of:
Choose one answer.
a. An impeller surrounded by a casing
b. A piston moving back and forth in a cylinder
c. Gears rotating in a housing
d. Sliding vanes
e. A pulsating disc - CORRECT ANSWER✔️✔️-a
A volute type pump:
Choose one answer.
a. Is a positive displacement pump
b. Has a progressively expanding spiral casing
c. Reduces the velocity in the discharge nozzle
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,d. Is more costly than diffuser pumps
e. Is a regenerative type pump - CORRECT ANSWER✔️✔️-b
A multi-stage pump would be used when:
Choose one answer.
a. The lift is great
b. A greater volume must be pumped
c. The head is great
d. The temperature of the liquid is high
e. There is sufficient floor space - CORRECT ANSWER✔️✔️-c
A rotary pump:
Choose one answer.
a. Is silent in operation
b. Has severe discharge pulsations
c. Should be equipped with a relief valve
d. Is a dynamic pump
e. Has very poor suction lift - CORRECT ANSWER✔️✔️-c
The capacity of a centrifugal pump should only be reduced by:
Choose one answer.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, a. Throttling the suction valve
b. Closing the suction valve
c. Closing both suction and discharge valves
d. Opening the pump casing vent valve
e. Throttling the discharge valve - CORRECT ANSWER✔️✔️-e
When starting up a rotary pump you must be sure that the:
Choose one answer.
a. Discharge valve is closed
b. Discharge valve is open
c. Pump is filled with air
d. Pump is at the correct temperature
e. Pump suction valve is closed - CORRECT ANSWER✔️✔️-b
The capacity of a centrifugal pump:
Choose one answer.
a. Varies with discharge pressure
b. Is fixed and can only be altered by changing the impeller
c. Indicates that the unit is a positive displacement type
d. Should be varied by suction valve manipulation
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
