Hydraulic Machines Quiz | Hydraulic Machines Objective Type Questions and Answers

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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

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

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

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

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

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

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

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

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

Answer: Energy
30 Pilot tube is used for measurement of .......
A Pressure
B Flow
C Velocity at a point
D Discharge

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

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

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

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

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

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

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

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

Answer: Low specific speed
39 Which of the following is not a rotary pump .......
A Gear
B Vane
C Screw
D Axial

Answer: Axial
40 Francis turbine is .......
A Radial flow turbine
B Axial flow turbine
C Mixed flow turbine
D Inward flow radial type turbine

Answer: Inward flow radial type turbine

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