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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
301.

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
302.

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
303.

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
304.

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
305.

The inlet passage of centrifugal pump is controlled by                

A. Gate
B. Head race
C. Turbine
D. Pump View Answer
Answer» A. Gate
discuss
306.

Gear pumps are used to transport                

A. Pressure
B. Speed
C. Power
D. Fluid View Answer
Answer» D. Fluid View Answer
discuss
307.

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
308.

The rotational kinetic energy comes from             

A. Engine motor
B. Pump
C. Tank
D. Draft tube View Answer
Answer» A. Engine motor
discuss
309.

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
310.

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
311.

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
312.

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
313.

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
314.

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
315.

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
316.

‘Ht’ means  

A. Tangential head
B. Horizontally head
C. Theory head pressure
D. Radially head pressure View Answer
Answer» C. Theory head pressure
discuss
317.

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
318.

With the increase in the input power, efficiency               

A. Increases
B. Decreases
C. Same
D. Independent View Answer
Answer» B. Decreases
discuss
319.

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
320.

With the increase in the flow rate, efficiency             

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» B. Increases
discuss
321.

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
322.

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
323.

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
324.

With the increase in energy head, efficiency                

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» B. Increases
discuss
325.

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
326.

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
327.

With increase in power, the efficiency                 

A. Decreases
B. Increases
C. Remains same
D. Independent View Answer
Answer» A. Decreases
discuss
328.

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
329.

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
330.

Vertical pump uses               

A. Draft tube
B. Throttle bush
C. Stuffing box
D. Interlining View Answer
Answer» B. Throttle bush
discuss
331.

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
332.

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
333.

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
334.

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
335.

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
336.

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
337.

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
338.

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
339.

A multistage centrifugal pumps has more than two               

A. Pumps
B. Impellers
C. Turbines
D. Magnetic pumps View Answer
Answer» B. Impellers
discuss
340.

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
341.

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
342.

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
343.

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
344.

At higher pressures, the impeller is connected in              

A. Series
B. Parallel
C. Equilibrium
D. Series and parallel View Answer
Answer» A. Series
discuss
345.

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
346.

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
347.

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
348.

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
349.

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
350.

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

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