4

0.25 m3/s

0.5 m3/s

1.5 m3/s

2.5 m3/s

A. 0.25 m3/s

4

102 watts

75 watts

550 watts

735 watts

4

N√P / H3/2

N√P / H²

N√P / H5/4

N√P / H3

4

Normal speed

Unit speed

Specific speed

None of these

4

# The jet ratio is defined as the ratio of the

Diameter of jet to the diameter of Pelton wheel

Velocity of jet to the velocity of Pelton wheel

Diameter of Pelton wheel to the diameter of jet

Velocity of Pelton wheel to the velocity of jet

4

Hydraulic

Mechanical

Overall

None of these

4

# If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

Geometric similarity

Kinematic similarity

Dynamic similarity

None of these

4

0.26

0.36

0.46

0.56

4

# Which type of the pump is different from others in the same group?

Screw pump

Gear pump

Cam and piston pump

Plunger pump

4

39.2 %

48.8 %

84.8 %

88.4 %

4

Q/√H

Q/H

Q/H3/2

Q/H²

4

# Francis, Kaplan and propeller turbines fall under the category of

Impulse turbines

Reaction turbines

Axial flow turbines

Mixed flow turbines

4

# Which of the following statement is correct?

The centrifugal pump is suitable for large discharge and smaller heads.

The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.

The efficiency of centrifugal pump is less as compared to reciprocating pump.

All of the above

4

# In reaction turbine, draft tube is used

To transport water downstream without eddies

To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

For safety of turbine

To increase flow rate

4

Product

Difference

Sum

None of these

4

ηh = ηo × ηm

ηm = ηm × ηh

ηo = ηh × ηm

None of these

4

# The cavitation in a hydraulic machine

Causes noise and vibration of various parts

Reduces the discharge of a turbine

Causes sudden drop in power output and efficiency

All of the above

4

10-15°

20-25°

30-40°

50-60°

4

# In a reaction turbine, the draft tube is used

To run the turbine full

To prevent air to enter the turbine

To increase the head of water by an amount equal to the height of the runner outlet above the tail race

To transport water to downstream

4

One-half

One-third

Two-third

Three-fourth

4

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

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

4

# The speed of a turbine runner is

Directly proportional to H1/2

Inversely proportional to H1/2

Directly proportional to H3/2

Inversely proportional to H3/2

4

(D/2d) + 5

(D/2d) + 10

(D/2d) + 15

(D/2d) + 20

4

# In an inward flow reaction turbine

The water flows parallel to the axis of the wheel

The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel

The water enters the wheel at the outer periphery and then flows towards the centre of the wheel

The flow of water is partly radial and partly axial

4

# The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Slow speed with radial flow at outlet

Medium speed with radial flow at outlet

High speed with radial flow at outlet

High speed with mixed flow at outlet

4

Potential Energy

Strain Energy

Kinetic energy

None of these

4

Pelton wheel

Kaplan turbine

Francis turbine

None of these

4

# When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

Horizontal

Nearly horizontal

Steep

First rise and then fall

4

Low velocity

High velocity

Low pressure

High pressure

4

# Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

Hydraulic ram

Hydraulic intensifier

Hydraulic torque converter

Hydraulic accumulator