Chapter:

190+ Pumps Solved MCQs

in Fluid Mechanics (FM)

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Chapter: Pumps
1.

Centrifugal pump is a                 

A. Turbomachinery
B. Flow regulating device
C. Drafting device
D. Intercooling device View Answer
Answer» A. Turbomachinery
discuss
2.

Turbomachines work under                

A. Newtons first law
B. Newtons second law
C. Newtons third law
D. Kepler’s law
Answer» B. Newtons second law
discuss
3.

The main function of centrifugal pumps are to                

A. Transfer speed
B. Transfer pressure
C. Transfer temperature
D. Transfer energy
Answer» D. Transfer energy
discuss
4.

Turbines and compressors work with the gas, while centrifugal pump transfers energy.

A. True
B. False
C. none
D. none
Answer» A. True
discuss
5.

The inlet passage of water entry is controlled by                

A. Head race
B. Gate
C. Tail race
D. Pump View Answer
Answer» B. Gate
discuss
6.

Centrifugal pumps are used to transport                

A. Pressure
B. Speed
C. Power
D. Fluid View Answer
Answer» D. Fluid View Answer
discuss
7.

Centrifugal pumps transport fluids by converting                  

A. Kinetic energy to hydrodynamic energy
B. Hydrodynamic energy to kinetic energy
C. Mechanical energy to kinetic energy
D. Mechanical energy to Hydrodynamic energy View Answer
Answer» A. Kinetic energy to hydrodynamic energy
discuss
8.

With the increase in load, Energy in the turbine               

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» A. Decreases
discuss
9.

When the balancing of the turbine is disturbed, we use                

A. Throttle governing
B. Steam governing
C. Nozzle governing
D. Emergency governing View Answer
Answer» D. Emergency governing View Answer
discuss
10.

The fluid coming into the centrifugal pump is accelerated by                

A. Throttle
B. Impeller
C. Nozzle
D. Governor View Answer
Answer» B. Impeller
discuss
11.

A gear pump uses                      

A. Petrochemical pumps
B. Meshing of gears
C. Froth pumps
D. Airlift pumps View Answer
Answer» B. Meshing of gears
discuss
12.

The fundamental significance of all the turbomachinery is              

A. Conservation of momentum
B. Conservation of mass
C. Conservation of heat
D. Conservation of speed View Answer
Answer» A. Conservation of momentum
discuss
13.

The most common pump used for hydraulic fluid power application is                    

A. Centrifugal pumps
B. Gear pump
C. Froth pumps
D. Airlift pumps View Answer
Answer» B. Gear pump
discuss
14.

The change of angular momentum in a pump is equal to the                  

A. Sum of speeds
B. Sum of individual momentum
C. Sum of temperatures
D. Sum of energy transferred from a body View Answer
Answer» B. Sum of individual momentum
discuss
15.

Conservation of angular momentum is described by              

A. Newtons equation
B. Euler’s equation
C. Rutherford’s equation
D. Maxim equation View Answer
Answer» B. Euler’s equation
discuss
16.

Gear pumps are mainly used in chemical installations because they pump                

A. High viscosity fluids
B. High density fluids
C. High pressure fluids
D. High temperature fluids View Answer
Answer» A. High viscosity fluids
discuss
17.

The inlet passage of centrifugal pump is controlled by                

A. Gate
B. Head race
C. Turbine
D. Pump View Answer
Answer» A. Gate
discuss
18.

Gear pumps are used to transport                

A. Pressure
B. Speed
C. Power
D. Fluid View Answer
Answer» D. Fluid View Answer
discuss
19.

Vertical Centrifugal pumps are also called as                  

A. Cantilever pumps
B. Hydrodynamic pump
C. Mechanical pump
D. Hydroelectric pump View Answer
Answer» A. Cantilever pumps
discuss
20.

The rotational kinetic energy comes from             

A. Engine motor
B. Pump
C. Tank
D. Draft tube View Answer
Answer» A. Engine motor
discuss
21.

Gear pumps are                      

A. Tangential flow pumps
B. Positive displacement pumps
C. Negative displacement pumps
D. Radial pumps View Answer
Answer» A. Tangential flow pumps
discuss
22.

The fluid gains while passing through the impeller.

A. Velocity
B. Pressure
C. Temperature
D. Velocity and pressure View Answer
Answer» D. Velocity and pressure View Answer
discuss
23.

What is the shape of the diffuser in the centrifugal pump?

A. Round
B. Dough nut
C. Rectangle
D. Cylindrical View Answer
Answer» B. Dough nut
discuss
24.

When the casing in a centrifugal pump decelerates the flow, what increases?

A. Pressure
B. Temperature
C. Volume
D. Flow rate View Answer
Answer» A. Pressure
discuss
25.

The velocity imparted by the impeller is converted into                  

A. Pressure energy
B. Kinetic energy
C. Momentum
D. Potential energy View Answer
Answer» A. Pressure energy
discuss
26.

The consequence of Newtons second law is                 

A. Conservation of angular momentum
B. Conservation of mass
C. Conservation of potential energy
D. Conservation of kinetic energy View Answer
Answer» A. Conservation of angular momentum
discuss
27.

What is a major advantage of centrifugal pump?

A. Cost
B. Simple in construction
C. Efficiency
D. Pump parameters View Answer
Answer» B. Simple in construction
discuss
28.

‘Ht’ means  

A. Tangential head
B. Horizontally head
C. Theory head pressure
D. Radially head pressure View Answer
Answer» C. Theory head pressure
discuss
29.

Different velocities in a centrifugal pump are determined by using                

A. Velocity triangle
B. Reynolds number
C. Froude number
D. Overall efficiency View Answer
Answer» A. Velocity triangle
discuss
30.

With the increase in the input power, efficiency               

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
31.

What does PSP stand for?

A. Pump start procedure
B. Positive start pump
C. Pump start pointer
D. Positive start pointer View Answer
Answer» A. Pump start procedure
discuss
32.

With the increase in the flow rate, efficiency             

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» B. Increases
discuss
33.

Pump efficiency is defined as the ratio of                      

A. Pressure to temperature
B. Temperature to pressure
C. Water horsepower to pump horsepower
D. Pump horse power to water horse power View Answer
Answer» C. Water horsepower to pump horsepower
discuss
34.

The difference in the total head of the pump is called               

A. Manometric head
B. Euler head
C. Pressure head
D. Shaft head View Answer
Answer» A. Manometric head
discuss
35.

The ratio of manometric head to the work head is called               

A. Manometric head
B. Euler head
C. Pressure head
D. Shaft head View Answer
Answer» B. Euler head
discuss
36.

With the increase in energy head, efficiency                

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» B. Increases
discuss
37.

The head added by the pump is a sum of                  

A. Pressure
B. Static lift
C. Volume
D. Flow rate View Answer
Answer» B. Static lift
discuss
38.

PHE stands for                    

A. Pump Hydraulic efficiency
B. Pressure Hydraulic efficiency
C. Power Hydraulic efficiency
D. Pump hydraulic engine View Answer
Answer» A. Pump Hydraulic efficiency
discuss
39.

With increase in power, the efficiency                 

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» A. Decreases
discuss
40.

Which among the following is used in mineral industries?

A. Vertical pumps
B. Horizontal pumps
C. Froth pumps
D. Multistage pumps View Answer
Answer» C. Froth pumps
discuss
41.

Vertical centrifugal pumps are also called as                

A. Froth pumps
B. Multistage pumps
C. Cantilever pumps
D. Magnetic pumps View Answer
Answer» C. Cantilever pumps
discuss
42.

Vertical pump uses               

A. Draft tube
B. Throttle bush
C. Stuffing box
D. Interlining View Answer
Answer» B. Throttle bush
discuss
43.

The most common application of vertical centrifugal pump is used in               

A. Parts washer
B. Mineral industry
C. Paper plating
D. Jukebox View Answer
Answer» A. Parts washer
discuss
44.

What does BEP stand for?

A. Best efficiency point
B. Brake ejection point
C. Break effect point
D. Best effect point View Answer
Answer» A. Best efficiency point
discuss
45.

The height of a column in a pump is called as               

A. Vertical head
B. Horizontal head
C. Static head
D. Multi head View Answer
Answer» C. Static head
discuss
46.

The centrifugal pump has varying flow depending on the                  

A. Pressure
B. Static lift
C. Volume
D. Flow rate View Answer
Answer» A. Pressure
discuss
47.

What is purpose of froth in froth pumps?

A. Separates rich minerals
B. Mixes rich minerals
C. Removes ores
D. Detects oil View Answer
Answer» A. Separates rich minerals
discuss
48.

When froth blocks the pump, it leads to               

A. Separation of rich minerals
B. Mixing of rich minerals
C. Removing of ores
D. Loss of prime View Answer
Answer» D. Loss of prime View Answer
discuss
49.

What affects volumetric efficiency of the pump?

A. Complex interactions
B. Internal interactions
C. Retain flow
D. Air flow View Answer
Answer» A. Complex interactions
discuss
50.

What is the purpose of inducer in a froth pump?

A. It recirculates air
B. The pressurizes the air
C. Froths are generated
D. It breaks the bubbles View Answer
Answer» D. It breaks the bubbles View Answer
discuss
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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