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Chapter:

190+ Pumps Solved MCQs

in Fluid Mechanics (FM)

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

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Chapter: Pumps
51.

A multistage centrifugal pumps has more than two               

A. Pumps
B. Impellers
C. Turbines
D. Magnetic pumps View Answer
Answer» B. Impellers
discuss
52.

The impeller is mounted on a                

A. Draft tube
B. Throttle bush
C. Stuffing box
D. Shaft View Answer
Answer» D. Shaft View Answer
discuss
53.

At each stage the fluid is directed                

A. Towards the centre
B. Away the centre
C. Towards the surface
D. Away from the centre View Answer
Answer» A. Towards the centre
discuss
54.

If the cylinder is filled with fuel or air it is said to be                      

A. 100% efficient
B. Transfer efficient
C. Nil efficient
D. Flow effective View Answer
Answer» A. 100% efficient
discuss
55.

SOH in a pump stands for_            

A. Shut Off head
B. Shut off heat
C. Shut off hybrid
D. Set off head View Answer
Answer» A. Shut Off head
discuss
56.

At higher pressures, the impeller is connected in              

A. Series
B. Parallel
C. Equilibrium
D. Series and parallel View Answer
Answer» A. Series
discuss
57.

When the flow output is higher, impellers are connected in               

A. Series
B. Parallel
C. Equilibrium
D. Series and parallel View Answer
Answer» B. Parallel
discuss
58.

The point at which piping system controls the flow rate is called             

A. Pressure point
B. Static lift
C. Operating point
D. Flow point View Answer
Answer» C. Operating point
discuss
59.

What is the common application of multistage centrifugal pump?

A. Mineral industries
B. Boiler feed water pump
C. Removes ores
D. Detects oil View Answer
Answer» B. Boiler feed water pump
discuss
60.

A multistage centrifugal pump produces a pressure of                    

A. 10 Pa
B. 100 MPa
C. 21 MPa
D. 150 MPa View Answer
Answer» C. 21 MPa
discuss
61.

All energy that is transferred from the fluid is derived from                

A. Electrical energy
B. Mechanical energy
C. Thermal energy
D. Chemical energy View Answer
Answer» B. Mechanical energy
discuss
62.

The point at which the centrifugal pump operates at maximum efficiency is called               

A. Duty point
B. Flow point
C. Static point
D. Operating point View Answer
Answer» A. Duty point
discuss
63.

What does TDH stand for?

A. Total dynamic head
B. Total depth head
C. Tight drum head
D. Target dynamic head View Answer
Answer» A. Total dynamic head
discuss
64.

The mechanical energy can be measured by             

A. Adiabatic expansion
B. Isentropic compression
C. Adiabatic compression
D. Isentropic expansion View Answer
Answer» B. Isentropic compression
discuss
65.

How many impellers does a multistage centrifugal pump have?

A. Zero
B. One
C. Exactly two
D. Two and more View Answer
Answer» D. Two and more View Answer
discuss
66.

The energy usage in pumping installation is determined by               

A. Friction characteristics
B. Pipe diameter
C. Surface tension
D. Thermal expansion View Answer
Answer» A. Friction characteristics
discuss
67.

Which among the following is a friction factor?

A. Newtons factor
B. Darcy’s factor
C. Transfer temperature
D. Heizenberg’s factor View Answer
Answer» B. Darcy’s factor
discuss
68.

What is the dimension for Darcy’s friction factor?

A. kg/m
B. N/mm
C. kg
D. Dimensionless View Answer
Answer» D. Dimensionless View Answer
discuss
69.

Formation of bubbles in an impeller is called             

A. Cavities
B. Defects
C. Friction
D. Heat burn View Answer
Answer» A. Cavities
discuss
70.

Centrifugal pump works by imparting               

A. Potential energy
B. Kinetic energy
C. Heat energy
D. Electrical energy View Answer
Answer» B. Kinetic energy
discuss
71.

What is the full form of NPSH in a pump?

A. Net pressure suction head
B. Net positive suction head
C. Non-pressure suction head
D. Net pressure super head View Answer
Answer» B. Net positive suction head
discuss
72.

When the NPSH is low, it leads to                

A. Breaking
B. Wear
C. Corrosion
D. Cavitation View Answer
Answer» D. Cavitation View Answer
discuss
73.

Wear of impeller can be worsened by                    

A. Draft tube
B. Pump pressure
C. Suspended solenoids
D. Turbine head View Answer
Answer» C. Suspended solenoids
discuss
74.

Which pump is the most efficient centrifugal pump?

A. Electrical pump
B. Reciprocating pump
C. Heat pump
D. Pressure pump View Answer
Answer» B. Reciprocating pump
discuss
75.

Corrosion in the pump is developed due to               

A. Pressure of air
B. Fluid properties
C. Draft tube
D. Tank dimensions View Answer
Answer» B. Fluid properties
discuss
76.

What is the effect of cavitation in boat propeller?

A. It recirculates air
B. The pressurizes the air
C. It leads to fast spinning
D. It breaks the bubbles View Answer
Answer» C. It leads to fast spinning
discuss
77.

The energy usage of a pump is determined by               

A. Adiabatic expansion
B. Power required
C. Adiabatic compression
D. Isentropic expansion View Answer
Answer» B. Power required
discuss
78.

For an oil field to have solid control, it needs               

A. Draft tubes
B. Throttle bush
C. Stuffing box
D. Centrifugal pumps View Answer
Answer» D. Centrifugal pumps View Answer
discuss
79.

If we lower the temperature, the water pump cavitation                

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
80.

Which among the following is not a centrifugal pump?

A. Sand pumps
B. Froth pumps
C. Slurry pumps
D. Energy pumps View Answer
Answer» D. Energy pumps View Answer
discuss
81.

Centrifugal pumps work under the same principle, but differ in their               

A. Working
B. Functions
C. Dimensions
D. Impeller View Answer
Answer» B. Functions
discuss
82.

If we raise the liquid level in the suction vessel, cavitation             

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
83.

Magnetic coupled pumps are also called as                  

A. Series pumps
B. Parallel pumps
C. Froth pumps
D. Drive pumps View Answer
Answer» D. Drive pumps View Answer
discuss
84.

When we change the pump, the cavitation             

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
85.

If we reduce the motor rpm in an impeller, cavitation               

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
86.

Decreasing the diameter of the eye of the impeller, cavitation                  

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» A. Increases
discuss
87.

There will be leakage only if there is                

A. High pressure
B. High temperature
C. Froths are generated
D. Casing breakage View Answer
Answer» D. Casing breakage View Answer
discuss
88.

When a pump casing is filled with liquid before it is started, it is called as                  

A. Adiabatic expansion
B. Priming
C. Adiabatic compression
D. Isentropic expansion View Answer
Answer» B. Priming
discuss
89.

The pump will become incapable of pumping in case of               

A. Gas bounding
B. Throttle bush
C. Stuffing box
D. Casing breakage View Answer
Answer» D. Casing breakage View Answer
discuss
90.

Priming is needed when impeller cannot impart enough                  

A. Draft speed
B. Energy
C. Pressure
D. Heat View Answer
Answer» B. Energy
discuss
91.

Priming performs response using                

A. Stimulus
B. Froth
C. Slurry
D. Heat View Answer
Answer» A. Stimulus
discuss
92.

To avoid gas bounding, the pump is                  

A. Heated
B. Elevated
C. Primed
D. Charged View Answer
Answer» C. Primed
discuss
93.

Centrifugal pumps are located the level of source

A. Below
B. Above
C. Parallel with
D. Series with View Answer
Answer» A. Below
discuss
94.

A pump that can evacuate air is called as                  

A. Series pumps
B. Self priming pumps
C. Froth pumps
D. Drive pumps View Answer
Answer» B. Self priming pumps
discuss
95.

What does CPO stand for?

A. Centrifugal pump operation
B. Centrifugal part operation
C. Centrifugal pump output
D. Centrifugal part output View Answer
Answer» A. Centrifugal pump operation
discuss
96.

Self priming pumps overshadow the function of                    

A. Self auxiliary device
B. Wear rate
C. Corrosion device
D. Cavitation device View Answer
Answer» A. Self auxiliary device
discuss
97.

What is necessary for self priming to take place?

A. Draft tube
B. Pump casing
C. Suspended solenoids
D. Turbine head View Answer
Answer» B. Pump casing
discuss
98.

Centrifugal pumps with an internal suction stage are called as                  

A. Series pumps
B. Self priming pumps
C. Froth pumps
D. Drive pumps View Answer
Answer» B. Self priming pumps
discuss
99.

During normal working operation, the pump works like                    

A. Centrifugal pumps
B. Self priming pumps
C. Froth pumps
D. Drive pumps View Answer
Answer» A. Centrifugal pumps
discuss
100.

What is purpose of vent valve in a pump?

A. High pressure control
B. High temperature control
C. Froths are generated can be minimized
D. To prevent siphon action View Answer
Answer» D. To prevent siphon action View Answer
discuss

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