Chapter:

190+ Pumps Solved MCQs

in Fluid Mechanics (FM)

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Chapter: Pumps
101.

In hydraulic head, NPSH is used for the analysis of                    

A. Adiabatic expansion
B. Priming
C. Wear
D. Cavitation View Answer
Answer» D. Cavitation View Answer
discuss
102.

NPSH is the difference between               

A. Suction pressure and vapour pressure
B. Vapour pressure and suction pressure
C. Suction pressure and heat
D. Shaft and head View Answer
Answer» A. Suction pressure and vapour pressure
discuss
103.

What can NPSH be used to determine              

A. Friction characteristics
B. Pipe diameter
C. Cavitation
D. Thermal expansion View Answer
Answer» C. Cavitation
discuss
104.

The measure of how close the fluid is to the given point is called                  

A. Flashing
B. Darcy’s factor
C. Transfer temperature
D. Heizenberg’s factor View Answer
Answer» A. Flashing
discuss
105.

NPSH is relevant                

A. Outside the pumps
B. Inside the pumps
C. Away from the pumps
D. Series and parallel with the pumps View Answer
Answer» A. Outside the pumps
discuss
106.

With the increase in cavitation, the drag coefficient of the impeller             

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» A. Increases
discuss
107.

What is positive suction head?

A. Draft tube is above
B. Pump pressure is above
C. Liquid level is above
D. Turbine head is above View Answer
Answer» C. Liquid level is above
discuss
108.

NPSHr is determined by using             

A. Pump pressure
B. PumpLinx
C. Heat transfer
D. Chemical energy View Answer
Answer» B. PumpLinx
discuss
109.

If we use two lower capacity pumps in parallel, cavitation                

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
110.

The characteristic curves of a centrifugal pump, plots required by the pump.

A. Velocity
B. Pressure
C. NPSH
D. Velocity and pressure View Answer
Answer» C. NPSH
discuss
111.

Which among the following is not a characteristic curve for centrifugal pump?

A. Transfer speed vs Transfer pressure
B. Head vs Flow rate
C. Power input vs pump efficiency
D. Specific speed vs pump efficiency View Answer
Answer» A. Transfer speed vs Transfer pressure
discuss
112.

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
113.

Which of the following is taken into account during a characteristic curve?

A. Flow rate
B. Cavitation
C. Tolerances
D. Casing View Answer
Answer» A. Flow rate
discuss
114.

As the specific speed increases, the slope of HQ curve               

A. Decreases
B. Increases
C. Independent
D. Remains the same View Answer
Answer» C. Independent
discuss
115.

The primary selection tool is called as              

A. Pump curve
B. Speed curve
C. Power curve
D. Fluid curve View Answer
Answer» A. Pump curve
discuss
116.

Voids are created due to             

A. Reaction ratio
B. Pressure ratio
C. Liquid free layers
D. Volumetric layers View Answer
Answer» C. Liquid free layers
discuss
117.

Cavitation usually occurs due to the changes in                

A. Pressure
B. Temperature
C. Volume
D. Heat View Answer
Answer» A. Pressure
discuss
118.

Degree of reactions are most commonly used in                

A. Turbomachinery
B. Pressure drag
C. Aerodynamics
D. Automobiles View Answer
Answer» A. Turbomachinery
discuss
119.

At high pressure, the voids can generate             

A. Drag force
B. Mass density
C. Shock waves
D. Flow speed View Answer
Answer» C. Shock waves
discuss
120.

Voids that implode near metal surface develops a              

A. Drag force
B. Cyclic stress
C. Shock waves
D. Flow speed View Answer
Answer» B. Cyclic stress
discuss
121.

Internal cavitation occurs due to                    

A. Drag force
B. Cyclic stress
C. Shock waves
D. Flow speed View Answer
Answer» C. Shock waves
discuss
122.

The velocities of the blade angles can be found out using                

A. Mach number
B. Froude’s number
C. Velocity triangles
D. Reynolds number View Answer
Answer» C. Velocity triangles
discuss
123.

Hydrodynamic cavitation is due to the process of                  

A. Vaporisation
B. Sedimentation
C. Filtration
D. Excavation View Answer
Answer» A. Vaporisation
discuss
124.

The process of bubble generation leads to                    

A. High temperatures
B. High pressures
C. High energy densities
D. High volumetric ratio View Answer
Answer» C. High energy densities
discuss
125.

Reciprocating pump is a                

A. Negative displacement pump
B. Positive displacement pump
C. Diaphragm pump
D. Emulsion pump
Answer» B. Positive displacement pump
discuss
126.

What happens to the reciprocating pump when left untouched?

A. Efficiency decreases
B. Wear and tear
C. Surface expansion
D. Pressure change
Answer» C. Surface expansion
discuss
127.

Reciprocating pumps operate by drawing into the chamber

A. Liquid
B. Pressure
C. Heat
D. Electricity
Answer» A. Liquid
discuss
128.

The cylinder of reciprocating cylinder is made up of               

A. Cast iron
B. Wrought iron
C. Aluminium
D. Copper View Answer
Answer» A. Cast iron
discuss
129.

The higher discharge valve line holds the discharge valve                

A. Open
B. Closed
C. Stop functioning
D. Automatic View Answer
Answer» B. Closed
discuss
130.

Reciprocating pumps are also called as                    

A. Force pumps
B. Mass Pumps
C. Heat pumps
D. Speed pumps View Answer
Answer» A. Force pumps
discuss
131.

Reciprocating pumps are classified according to                      

A. Drag force
B. Number of cylinders
C. Shock waves
D. Flow speed View Answer
Answer» B. Number of cylinders
discuss
132.

Simple hand operating pump is also called as             

A. Froth pump
B. Bicycle pump
C. Multistage pumps
D. Centrifugal pumps View Answer
Answer» B. Bicycle pump
discuss
133.

Power operated pump in which only one side engages the fluid displacement is called

A. Froth pump
B. Single acting
C. Double acting
D. Bicycle pump View Answer
Answer» B. Single acting
discuss
134.

Operation of reciprocating motion is done by a source

A. Power
B. Energy
C. Momentum
D. Inertia View Answer
Answer» A. Power
discuss
135.

An up and down back and forth relative linear motion is called                    

A. Reciprocation
B. Rotation
C. Filtration
D. Excavation View Answer
Answer» A. Reciprocation
discuss
136.

Power operated pump in which only both sides engage the fluid displacement is called

A. Froth pump
B. Single acting
C. Double acting
D. Bicycle pump View Answer
Answer» C. Double acting
discuss
137.

The two opposite motion that comprise a single reciprocation is called                  

A. Turbocharger
B. Stokes
C. Fluid motion
D. Auto motion View Answer
Answer» A. Turbocharger
discuss
138.

Reciprocating pumps has efficiency compared to centrifugal pumps

A. Higher
B. Lower
C. Equal
D. Exponential View Answer
Answer» B. Lower
discuss
139.

Reciprocating pumps works on the principle of                    

A. Drag force
B. Liquid flow push
C. Shock waves
D. Flow speed View Answer
Answer» B. Liquid flow push
discuss
140.

Reciprocating pump is a type of                      

A. Positive displacement pump
B. Bicycle pump
C. Multistage pumps
D. Centrifugal pumps View Answer
Answer» A. Positive displacement pump
discuss
141.

During the suction stroke the moves left thus creating vacuum in the Cylinder.

A. Piston
B. Cylinder
C. Valve
D. Pump View Answer
Answer» A. Piston
discuss
142.

When both the sources are effective it is called as                    

A. Double acting pump
B. Single acting pump
C. Triple acting pump
D. Normal pump View Answer
Answer» A. Double acting pump
discuss
143.

A repetitive variation about the central value of equilibrium is called                

A. Reciprocation
B. Oscillation
C. Filtration
D. Excavation View Answer
Answer» B. Oscillation
discuss
144.

A linear wheel turning motion is called as a                

A. Reciprocation
B. Rotation
C. Oscillation
D. Bicycle pump View Answer
Answer» B. Rotation
discuss
145.

A reciprocating pump that has 1200 crank is                  

A. Froth pump
B. Single acting
C. Double acting
D. Triple acting View Answer
Answer» D. Triple acting View Answer
discuss
146.

In a positive displacement pump, what gets displaced?

A. Fluid
B. Volume
C. Pressure
D. Temperature View Answer
Answer» B. Volume
discuss
147.

What happens to the reciprocating pump when left untouched?

A. Efficiency decreases
B. Wear and tear
C. Surface expansion
D. Pressure change View Answer
Answer» C. Surface expansion
discuss
148.

Positive displacement pumps are capable of developing pressures, in suction pressure.

A. High, low
B. Low, high
C. High, high
D. Low, low View Answer
Answer» A. High, low
discuss
149.

When is a reciprocating pump used?

A. When quantity of liquid is small
B. When quantity of liquid is large
C. To pump high pressure
D. To pump low pressure View Answer
Answer» A. When quantity of liquid is small
discuss
150.

Positive displacement pumps are also called as_                 

A. Constant pressure pump
B. Pressure drag pumps
C. Constant volume pumps
D. Constant head pumps View Answer
Answer» C. Constant volume pumps
discuss
151.

In centrifugal pumps, their capacity is affected due to                     

A. Drag force
B. Cyclic stress
C. Shock waves
D. Pressure View Answer
Answer» D. Pressure View Answer
discuss
152.

A quantity of fluid that leaks from a higher pressure discharge to a lower pressure discharge is called            

A. Slip
B. Heat
C. Friction
D. Enthalpy View Answer
Answer» A. Slip
discuss
153.

Positive displacement pumps regulate the flow by varying its                

A. Drag force
B. Cyclic stress
C. Shock waves
D. Flow speed View Answer
Answer» D. Flow speed View Answer
discuss
154.

Simplest example of single acting reciprocating pump is              

A. Mineral ores
B. Whirl wheels
C. Bicycle tires
D. Syringe View Answer
Answer» D. Syringe View Answer
discuss
155.

Rotary pumps do not function well under               

A. High Vaporisation
B. High Sedimentation
C. High viscosity
D. Excavation View Answer
Answer» C. High viscosity
discuss
156.

The parameter that disturbs the working of the rotary pump is_          

A. High Vaporisation
B. High Sedimentation
C. Low flow rate
D. Excavation View Answer
Answer» C. Low flow rate
discuss
157.

Rotary pumps are commonly used to circulate_              

A. Lube oils
B. Petroleum
C. Diesel
D. Water View Answer
Answer» A. Lube oils
discuss
158.

Capacity of a rotary pump is defined as                  

A. Total liquid displaced
B. Overall performance of pump
C. Maximum fluid flow
D. Minimum fluid flow View Answer
Answer» A. Total liquid displaced
discuss
159.

What type of flow does the reciprocating pump have?

A. Uniform
B. Continuous
C. Pulsating
D. Non-uniform View Answer
Answer» B. Continuous
discuss
160.

What is the full form of PD?

A. Positive displacement
B. Pump displacement
C. Plunger displacement
D. Plunger direct View Answer
Answer» A. Positive displacement
discuss
161.

Why can’t rotary pumps non-lubricate water?

A. Because it has lesser viscosity
B. Because it contains abrasive particles
C. Multistage pumps are difficult to operate
D. Draft tube is thin View Answer
Answer» B. Because it contains abrasive particles
discuss
162.

The maximum speed of reciprocating pump is                    

A. 20m/min
B. 30m/min
C. 40m/min
D. 50m/min View Answer
Answer» B. 30m/min
discuss
163.

The pump that uses a relatively smaller amount of liquid is called                

A. Froth pump
B. Reciprocating pump
C. Double acting
D. Bicycle pump View Answer
Answer» B. Reciprocating pump
discuss
164.

Sliding vanes in pumps are held by                

A. Draft pins
B. Whirl wheels
C. Springs
D. Nails View Answer
Answer» C. Springs
discuss
165.

Air vessel accumulates excess quantity of             

A. Vapor
B. Water
C. Heat
D. Pressure View Answer
Answer» B. Water
discuss
166.

In which pump is the liquid in contact with both the sides of the plunger          

A. Froth pump
B. Single acting
C. Double acting
D. Bicycle pump View Answer
Answer» C. Double acting
discuss
167.

When a cylinder has inlet and outlet ports at each end, then it is called as                    

A. Double acting
B. Air lift pumps
C. Reciprocating pumps
D. Centrifugal pumps View Answer
Answer» A. Double acting
discuss
168.

Turbomachines work under                

A. Newtons first law
B. Newtons second law
C. Newtons third law
D. Kepler’s law View Answer
Answer» B. Newtons second law
discuss
169.

The main function of nozzle is to                    

A. Varying temperatures
B. Pressure variations
C. Load variations
D. Heat variations View Answer
Answer» B. Pressure variations
discuss
170.

When the piston moves forward, liquid is drawn                

A. Into the cylinder
B. Away from the cylinder
C. Into the draft tube
D. Away from the draft tube View Answer
Answer» A. Into the cylinder
discuss
171.

In a reciprocating pump, with the change in discharge pressure,                

A. The Volume delivered increases
B. The volume delivered decreases
C. Volume delivered remains the same
D. Volume delivered is independent View Answer
Answer» C. Volume delivered remains the same
discuss
172.

The amount of fluid that leaks internally is called                

A. Head race
B. Slip
C. Tail race
D. Internal friction View Answer
Answer» B. Slip
discuss
173.

For a good condition, slip should be_              

A. Below 1 percent
B. 1 to 2 percent
C. 3 to 4 percent
D. Above 5 percent View Answer
Answer» A. Below 1 percent
discuss
174.

If the slip is above 5 percent, the pumps needs to be             

A. Dragged
B. Overhauled
C. Retracted
D. Intermittent View Answer
Answer» B. Overhauled
discuss
175.

Slip in a pump depends on which of following parameters?

A. Wear
B. Pressure
C. Temperature
D. Heat View Answer
Answer» A. Wear
discuss
176.

Internal breakage in a pump mainly takes place when                

A. Discharge pressure is increased
B. Temperature is increased
C. Heat leads to expansion
D. Corrosion takes place View Answer
Answer» A. Discharge pressure is increased
discuss
177.

The output that we get after an internal breakage can be classed as                  

A. An increase
B. A decrease
C. Constant
D. An independent variable View Answer
Answer» C. Constant
discuss
178.

When the hydraulic fluid forms on only one side of the piston, it is called               

A. Single acting pump
B. Double acting pump
C. Froth pump
D. Draft tube View Answer
Answer» A. Single acting pump
discuss
179.

A pump with two steams and two water cylinders is called                

A. Single acting pump
B. Double acting pump
C. Froth pump
D. Duplex pump View Answer
Answer» D. Duplex pump View Answer
discuss
180.

When an external force is not available in a pump, we use a                

A. Hydraulic cylinder
B. Slip gauge
C. Tail race
D. Heater View Answer
Answer» A. Hydraulic cylinder
discuss
181.

Reciprocating pumps give a flow

A. Uniform
B. Non- uniform
C. Pulsating
D. Sinusoidal View Answer
Answer» C. Pulsating
discuss
182.

Suction stroke becomes difficult to pump             

A. High temperature fluids
B. Viscous fluids
C. Fluids with abrasives
D. High velocity fluids View Answer
Answer» B. Viscous fluids
discuss
183.

Piston pumps are very               

A. Expensive
B. Cheap
C. Reasonable
D. Intricate View Answer
Answer» A. Expensive
discuss
184.

What is the full form of DAC?

A. Digital Acting pumps
B. Double acting pumps
C. Data acting pumps
D. Draft tube pumps View Answer
Answer» B. Double acting pumps
discuss
185.

Which among the following is not a multi-cylinder pump?

A. Double acting simplex
B. Single acting duplex
C. Double acting duplex
D. Single acting triplex View Answer
Answer» A. Double acting simplex
discuss
186.

A pressure vessel is used to hold              

A. Air
B. Gases
C. Molecules
D. Solids View Answer
Answer» B. Gases
discuss
187.

A tank that is used to protect closed water heating systems is called                

A. Pressure vessel
B. Expansion vessel
C. Heat vessel
D. Auto vessel View Answer
Answer» B. Expansion vessel
discuss
188.

How is the construction of the vessel tested?

A. Uniform testing
B. Continuous testing
C. Pulsating test
D. Non-destructive testing View Answer
Answer» D. Non-destructive testing View Answer
discuss
189.

Where is the excess quantity of water from the pump accumulated?

A. Froth tube
B. Draft tube
C. Air vessels
D. Bicycle pump View Answer
Answer» C. Air vessels
discuss
190.

What is the shape of a pressure vessel?

A. Square
B. Spheres
C. Cones
D. All the shapes View Answer
Answer» D. All the shapes View Answer
discuss
191.

Pressure vessel closures are used to                  

A. Avoid breakage
B. Avoid leakage
C. Retain structures
D. Maintain pressure View Answer
Answer» C. Retain structures
discuss

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