Hydraulic Machines Objective Type Questions and Answers

Questions

21 According to fan laws, at constant pressure,the speed capacity and power vary......

A Directly as the air or gas density

B Inversely as square root of density

C Inversely as density

D As square of density

View Answer

Answer: Inversely as square root of density

22 According to fan laws, at constant speed and capacity,the pressure and power very......

A Directly as the air or gas density

B Inversely as square root of density

C Inversely as density

D As square of density

View Answer

Answer: Directly as the air or gas density

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23 According to fan laws,for fans having constant wheel diameter, the power demand varies .........

A Directly as a fan speed

B Square of fan speed

C Cube of fan speed

D Square root of fans speed

View Answer

Answer: Cube of fan speed

24 According to fan laws,for fans having constant wheel diameter, the air or gas capacity varies .......

A directly as a fan speed

B square of fan speed

C cube of fan speed

D square root of fans speed

View Answer

Answer: directly as a fan speed

25 According to fan laws,for fans having constant wheel diameter, the pressure varies .......

A Directly as a fan speed

B Square of fan speed

C Cube of fan speed

D Square root of fans speed

View Answer

Answer: Square of fan speed

26 Continuity equation deals with the law of conservation of .......

A Mass

B Momentum

C Energy

D None of the above

View Answer

Answer: Mass

27 A stream line is a line ......

A Which is along the path of a particle

B Which is always parallel to the main direction of flow

C Across which there is no flow

D On which tangent drawn at any point gives the direction of velocity

View Answer

Answer: Across which there is no flow

28 The flow in pipe is laminar if .........

A Reynolds number is equal to 2500

B Reynolds number is equal to 4000

C Reynolds number is more than 2500

D None of the above

View Answer

Answer: None of the above

29 Bernoulli's theorem deals with the law of conservation of .......

A Mass

B Momentum

C Energy

D None of them

View Answer

Answer: Energy

30 Pilot tube is used for measurement of .......

A Pressure

B Flow

C Velocity at a point

D Discharge

View Answer

Answer: Velocity at a point

31 As specific speed of a centrifugal pump increases its blade height ......

A Increases

B Decreases

C Remains unaffected

D Increase or decrease depends on other factors

View Answer

Answer: Decreases

32 Higher specific speed (300 to 1000 ) of turbine indicates that the turbine is......

A Pelton wheel

B Kaplan

C Francis

D Any of the above

View Answer

Answer: Kaplan

33 Higher specific speed (161 to 500 ) of centrifugal pump indicates that the pump is .........

A Axial type

B Mixed flow type

C Axial flow

D Any of the above

View Answer

Answer: Axial flow

34 For Flood control and irrigation applications the pump generally used is.......

A Centrifugal type

B Ceciprocating type

C Axial flow type

D Radial flow type

View Answer

Answer: Axial flow type

35 Cavitation in hydraulic turbine results in .......

A Noise and vibration

B Reduction of discharge

C Drop in output and efficiency

D Rough surface

View Answer

Answer: Rough surface

36 For small discharge and high heads which pump is preferred ......

A Centrifugal type

B Reciprocating type

C Axial flow type

D Radial flow type

View Answer

Answer: Reciprocating type

37 Which of the following pumps is used for pumping viscous fluids......

A Centrifugal pump

B Screw pump

C Reciprocating pump

D Jet pump

View Answer

Answer: Screw pump

38 Impellers for high heads usually have .........

A High specific speed

B Low specific speed

C Medium specific speed

D Variable specific speed

View Answer

Answer: Low specific speed

39 Which of the following is not a rotary pump .......

A Gear

B Vane

C Screw

D Axial

View Answer

Answer: Axial

40 Francis turbine is .......

A Radial flow turbine

B Axial flow turbine

C Mixed flow turbine

D Inward flow radial type turbine

View Answer

Answer: Inward flow radial type turbine

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