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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 .

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Chapter: Pumps
401.

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
402.

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
403.

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
404.

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
405.

Cavitation usually occurs due to the changes in                

A. Pressure
B. Temperature
C. Volume
D. Heat View Answer
Answer» A. Pressure
discuss
406.

Degree of reactions are most commonly used in                

A. Turbomachinery
B. Pressure drag
C. Aerodynamics
D. Automobiles View Answer
Answer» A. Turbomachinery
discuss
407.

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
408.

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
409.

Internal cavitation occurs due to                    

A. Drag force
B. Cyclic stress
C. Shock waves
D. Flow speed View Answer
Answer» C. Shock waves
discuss
410.

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
411.

Hydrodynamic cavitation is due to the process of                  

A. Vaporisation
B. Sedimentation
C. Filtration
D. Excavation View Answer
Answer» A. Vaporisation
discuss
412.

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
413.

Reciprocating pump is a                

A. Negative displacement pump
B. Positive displacement pump
C. Diaphragm pump
D. Emulsion pump
Answer» B. Positive displacement pump
discuss
414.

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
415.

Reciprocating pumps operate by drawing into the chamber

A. Liquid
B. Pressure
C. Heat
D. Electricity
Answer» A. Liquid
discuss
416.

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
417.

The higher discharge valve line holds the discharge valve                

A. Open
B. Closed
C. Stop functioning
D. Automatic View Answer
Answer» B. Closed
discuss
418.

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
419.

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
420.

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
421.

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
422.

Operation of reciprocating motion is done by a source

A. Power
B. Energy
C. Momentum
D. Inertia View Answer
Answer» A. Power
discuss
423.

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
424.

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
425.

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
426.

Reciprocating pumps has efficiency compared to centrifugal pumps

A. Higher
B. Lower
C. Equal
D. Exponential View Answer
Answer» B. Lower
discuss
427.

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
428.

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
429.

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
430.

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
431.

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
432.

A linear wheel turning motion is called as a                

A. Reciprocation
B. Rotation
C. Oscillation
D. Bicycle pump View Answer
Answer» B. Rotation
discuss
433.

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
434.

In a positive displacement pump, what gets displaced?

A. Fluid
B. Volume
C. Pressure
D. Temperature View Answer
Answer» B. Volume
discuss
435.

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
436.

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
437.

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
438.

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
439.

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
440.

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
441.

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
442.

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
443.

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
444.

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
445.

Rotary pumps are commonly used to circulate_              

A. Lube oils
B. Petroleum
C. Diesel
D. Water View Answer
Answer» A. Lube oils
discuss
446.

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
447.

What type of flow does the reciprocating pump have?

A. Uniform
B. Continuous
C. Pulsating
D. Non-uniform View Answer
Answer» B. Continuous
discuss
448.

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
449.

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
450.

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

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