Hydraulic Machines Multiple Choice Questions and Answers

Questions

1 In Kaplan turbine runner,the number of blades is generally of the order......

A 2-4

B 4-8

C 8-16

D 16-24

View Answer

Answer: 16-24

2 In Kaplan turbine runner,the number of blades is generally of the order ......

A 2-4

B 4-8

C 8-16

D 16-24

View Answer

Answer: 4-8

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3 Specific speed for axial flow turbines ranges from .........

A 0 to 4.5

B 10 to 100

C 80 to 200

D 250 to 300

View Answer

Answer: 80 to 200

4 Specific speed for reaction turbines ranges from .......

A 0 to 4.5

B 10 to 100

C 80 to 200

D 250 to 300

View Answer

Answer: 10 to 100

5 Specific speed for impulse wheels ranges from .......

A 0 to 4.5

B 10 to 100

C 80 to 200

D 250 to 300

View Answer

Answer: 0 to 4.5

6 Indicator diagram of a reciprocating pump is a graph between......

A Floor vs swept volume

B Pressure in cylinder vs swept volume

C Flow vs speed

D Pressure vs speed

View Answer

Answer: Pressure in cylinder vs swept volume

7 In a centrifugal pumps maximum efficiency is obtained when the plates are ......

A straight

B Bent forward

C Bent backward

D Radial

View Answer

Answer: Bent backward

8 For small discharge at high-pressure following pump is preferred .........

A Centrifugal

B Axial flow

C Mixed flow

D Reciprocating

View Answer

Answer: Reciprocating

9 In a centrifugal pump the liquid enters the pump .......

A At the top

B At the bottom

C At the centre

D From sides

View Answer

Answer: At the centre

10 Discharge of a centrifugal pump is proportional to .......

A Impeller diameter(D)

B D 2

C D 3

D 1/D 3

View Answer

Answer: D 2

11 Power required to drive a centrifugal pump is proportional to ......

A Seed (N)

B N 2

C N 3

D N 4

View Answer

Answer: N 3

12 Low specific speed of a pump implies it is ......

A Centrifugal pump

B Mixed flow pump

C Axial flow pump

D Any of the above

View Answer

Answer: Centrifugal pump

13 Medium specific speed of a pump implies it is .........

A Centrifugal pump

B Mixed flow pump

C Axial flow pump

D Any of the above

View Answer

Answer: Mixed flow pump

14 High specific speed of a pump implies it is .......

A Centrifugal pump

B Mixed flow pump

C Axial flow pump

D Any of the above

View Answer

Answer: Axial flow pump

15 Low specific speed of turbine implies it is .......

A Propeller turbine

B Francis turbine

C Impulse turbine

D Any of the above

View Answer

Answer: Impulse turbine

16 Cavitation can take place in case of ......

A Pelton wheel

B Francis turbine

C Reciprocating pump

D Both Francis turbine and reciprocating pump

View Answer

Answer: Both Francis turbine and reciprocating pump

17 Total energy line (T.E.L.) represents the sum of ......

A Pressure head and kinetic head

B Kinetic head and datum head

C Pressure head and datum head

D Pressure head,kinetic head and datum head

View Answer

Answer: Pressure head,kinetic head and datum head

18 Hydraulic gradient line (H.G.L.) represents the sum of .........

A Pressure head and kinetic head

B Kinetic head and datum head

C Pressure head and datum head

D Pressure head,kinetic head and datum head

View Answer

Answer: Pressure head,kinetic head and datum head

19 Hydraulic intensifier is a device used for.......

A Storing energy of a fluid in the form of pressure energy

B Increasing pressure intensity of a fluid

C Transmitting the power from one shaft to another

D None of the above

View Answer

Answer: Increasing pressure intensity of a fluid

20 Hydraulic accumulator is a device used for .......

A Lifting heavy weights

B Storing the energy of the fluid in the form of pressure energy

C Increasing the pressure intensity of a fluid

D None of the above

View Answer

Answer: Storing the energy of the fluid in the form of pressure energy

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