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1080+ Fluid Mechanics (FM) Solved MCQs

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

Chapters

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Chapter: Pumps
351.

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
352.

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
353.

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
354.

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
355.

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
356.

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
357.

Formation of bubbles in an impeller is called             

A. Cavities
B. Defects
C. Friction
D. Heat burn View Answer
Answer» A. Cavities
discuss
358.

Centrifugal pump works by imparting               

A. Potential energy
B. Kinetic energy
C. Heat energy
D. Electrical energy View Answer
Answer» B. Kinetic energy
discuss
359.

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
360.

When the NPSH is low, it leads to                

A. Breaking
B. Wear
C. Corrosion
D. Cavitation View Answer
Answer» D. Cavitation View Answer
discuss
361.

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
362.

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
363.

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
364.

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
365.

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
366.

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
367.

If we lower the temperature, the water pump cavitation                

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
368.

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
369.

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
370.

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
371.

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
372.

When we change the pump, the cavitation             

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
373.

If we reduce the motor rpm in an impeller, cavitation               

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
374.

Decreasing the diameter of the eye of the impeller, cavitation                  

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» A. Increases
discuss
375.

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
376.

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
377.

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
378.

Priming is needed when impeller cannot impart enough                  

A. Draft speed
B. Energy
C. Pressure
D. Heat View Answer
Answer» B. Energy
discuss
379.

Priming performs response using                

A. Stimulus
B. Froth
C. Slurry
D. Heat View Answer
Answer» A. Stimulus
discuss
380.

To avoid gas bounding, the pump is                  

A. Heated
B. Elevated
C. Primed
D. Charged View Answer
Answer» C. Primed
discuss
381.

Centrifugal pumps are located the level of source

A. Below
B. Above
C. Parallel with
D. Series with View Answer
Answer» A. Below
discuss
382.

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
383.

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
384.

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
385.

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
386.

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
387.

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
388.

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
389.

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
390.

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
391.

What can NPSH be used to determine              

A. Friction characteristics
B. Pipe diameter
C. Cavitation
D. Thermal expansion View Answer
Answer» C. Cavitation
discuss
392.

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
393.

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
394.

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
395.

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
396.

NPSHr is determined by using             

A. Pump pressure
B. PumpLinx
C. Heat transfer
D. Chemical energy View Answer
Answer» B. PumpLinx
discuss
397.

If we use two lower capacity pumps in parallel, cavitation                

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
398.

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
399.

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
400.

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

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