# Multiple-Choice Questions or MCQ on Pumps [Free PDF Included]

Hello readers! Here, I will discuss all the pumps through some MCQ Questions and Short questions. When you read the questions and answers in place of a long text, you feel relaxed and the information is stored in your mind for a long time. Isn’t it? I am giving you a lot of MCQ Questions on Pumps and also there will be a quiz on pumps.

Pumps are used to deliver the fluid from one place to another by creating a head. Basically, mechanical energy is converted into hydraulic energy. In the case of a Centrifugal pump, hydraulic energy remains in the form of pressure energy. Mechanical energy is converted into pressure energy with the help of centrifugal force created in the impeller.

Let’s start the MCQ questions without further delay.

## Multiple-Choice Questions or MCQ on Pumps

• Which of the following is correct in a centrifugal pump?
1. Q α D2
2. Q α 1/D2
3. Q α D3
4. Q α 1/ D3

Ans: (2)

• In a multistage centrifugal pump, the number of impellers is:
1. 1
2. 2 or more
3. 0
4. None of these

Ans: (2)

• For getting higher flow at the outlet of the centrifugal pump, impellers should be connected in
1. Series
2. Parallel
3. Anyone
4. Can’t say

Ans: (2)

• For getting higher pressure at the outlet of the centrifugal pump, impellers should be connected in
1. Series
2. Parallel
3. Anyone
4. Can’t say

Ans: (1)

• Centrifugal pumps are normally of
1. High capacity and low head
2. Low capacity and high head
3. High capacity and high head
4. Low capacity and low head

Ans: (1)

• Positive displacement pumps are of
1. High capacity and low head
2. Low capacity and high head
3. High capacity and high head
4. Low capacity and low head

Ans: (2)

• Centrifugal pumps are not suitable for:
1. Low viscosity fluids
2. High viscosity fluids
3. Can’t say

Ans: (2)

• The efficiency of a centrifugal pump
1. Decreases with an increase in viscosity
2. Increases with increase in viscosity
3. Does not vary with the change in viscosity
4. Can’t say

Ans: (1)

The efficiency of a positive displacement pump

1. Decreases with an increase in viscosity
2. Increases with increase in viscosity
3. Does not vary with the change in viscosity
4. Can’t say

Ans: (2)

• Centrifugal pumps require:
1. Creating a vacuum on the suction side before starting the pump
2. Creating a vacuum on the discharge side before starting the pump
3. Priming before starting the pump
4. None of the above

Ans: (3)

• Which pumps are called self-primed pumps?
1. Positive displacement pump
2. Centrifugal pump
3. Both (1) and (2)
4. Can’t say

Ans: (1)

• In which pump, flow is constant?
1. Positive displacement pump
2. Centrifugal pump
3. Both (1) and (2)
4. Can’t say

Ans: (2)

• In which pump, flow is pulsating?
1. Positive displacement pump
2. Centrifugal pump
3. Both (1) and (2)
4. Can’t say

Ans: (1)

• Which of the following is correct as per pump affinity law?
1. P α N2
2. P α N-2
3. P α N3
4. P α N-3

Ans: (3)

• Which of the following is correct as per pump affinity law?
1. H α N2
2. H α N-2
3. H α N3
4. H α N-3

Ans: (1)

• The indicator diagram of a centrifugal pump is a
1. The graph between the pressure in the cylinder and temperature
2. The graph between swept volume and speed
3. The graph between swept volume and temperature
4. The graph between the pressure in the cylinder and swept volume

Ans: (4)

• In a centrifugal pump, liquid enters the pump through
1. The center
2. The top
3. The bottom
4. Can’t say

Ans: (1)

• When the flow is less but you want high pressure, which pump will you choose?
1. Axial flow pump
2. Centrifugal Pump
3. Reciprocating Pump
4. None of these

Ans: (3)

• The specific speed of a centrifugal pump can be calculated from the:
1. (N*Q)/(H^0.75)
2. (N*Q^0.5)/(H)
3. (N*Q^0.0.75)/(H^0.5)
4. (N*Q^0.5)/(H^0.75)

Ans: (4)

• Which of the following pump has the highest specific speed?
1. Centrifugal pump
2. Mixed flow pump
3. Axial flow pump
4. None of these

Ans: (3)

• Which are the parts of a centrifugal pump?
1. Casing
2. Suction pipe
3. Impeller
4. All of the above

Ans: (4)

• Coupling shall be designed with a safety factor _ times the shaft safety factor.
1. 1
2. 1.5
3. 2
4. 2.5

Ans: (2)

• Normally for how long a hydrostatic test of a centrifugal pump should be conducted?
1. 5 minutes
2. 10 minutes
3. 15 minutes
4. 30 minutes

Ans  (4)

•  What is the relation between the test pressure and the pump shut-off pressure?
1. Test pressure = shut off pressure
2. Test pressure =2x shut-off pressure
3. Test pressure = 1.5x shut-off pressure
4. All of the above
5. None of these.

Ans: (3)

• Priming is the process by which
1. The suction pipe, delivery pipe, up to the delivery valve is filled with liquid after starting the motor from an outside source
2. The suction pipe, delivery pipe, up to the delivery valve is filled with liquid before starting the motor.
3. Only the suction pipe is filled with liquid before starting the motor from an outside source.
4. Only the delivery pipe, up to the delivery valve, is filled with liquid before starting the motor from an outside source

Ans: (2)

•  Priming in the pump is required:
1.  To remove the air from the pump
2. To avoid the generation of negative pressure
3. Both (1) and (2)
4. None of these

Ans: (3)

## Conclusion

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