4

0 to 25 m

25 m to 250 m

Above 250 m

None of these

B. 25 m to 250 m

4

Casing

Delivery pipe

Suction pipe

Impeller

4

# Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

High initial and maintenance cost

Lower discharge

Lower speed of operation

Necessity of air vessel

4

# Puck up the wrong statement about centrifugal pump

Discharge a diameter

Power a speed⁴

4

# The specific speed of a hydraulic turbine depends upon

Speed and power developed

Discharge and power developed

Speed, power developed and head of water

4

# The runaway speed of a hydraulic turbine is the speed

At which there will be no damage to the runner

At which the turbine will run freely without load

4

# According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

4

Potential Energy

Strain Energy

Kinetic energy

None of these

4

Normal speed

Unit speed

Specific speed

None of these

4

Double

Three times

Four times

Five times

4

1/√2

1/2

1

√2

4

# Multistage centrifugal pumps are used to

Give high discharge

Pump viscous fluids

All of these

4

# Which of the following pump is successfully used for lifting water to the turbines?

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

4

At the top

At the bottom

At the canter

From sides

4

# In order to avoid cavitation in centrifugal pumps

The suction pressure should be high

The delivery pressure should be high

The suction pressure should be low

The delivery pressure should be low

4

# Discharge of a centrifugal pump is

Directly proportional to diameter of its impeller

Inversely proportional to diameter of its impeller

Directly proportional to (diameter)² of its impeller

Inversely proportional to (diameter)² of its impeller

4

# Runaway speed of a hydraulic turbine is

The speed at which turbine runner will be damaged

The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

The speed corresponding to maximum overload permissible

4

# Which place in hydraulic turbine is most susceptible for cavitations?

Inlet of draft rube

Penstock

4

Remain same

Increases

Decreases

None of these

4

# Delivery head of a centrifugal pump is

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

4

# Pressure intensifier increases the pressure in proportion to

Ratio of diameters

Square of ratio of diameters

Inverse ratio of diameters

Square of inverse ratio of diameters

4

0.25 m3/s

0.5 m3/s

1.5 m3/s

2.5 m3/s

4

waV / 2g

waV / g

waV² / 2g

waV² / g

4

P/ √H

P/ H

P/ H3/2

P/ H²

4

# Dynamic similarity is said to exist between the model and the prototype, if both of them

Have identical velocities

Are equal in size and shape

Are identical in shape, but differ only in size

None of the above

4

# Which of the following pump is preferred for flood control and irrigation applications?

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

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

# Maximum impulse will be developed in hydraulic ram when

Waste valve closes suddenly

Supply pipe is long

Supply pipe is short

Ram chamber is large

4

# Axial flow pump is started with its delivery valve

Kept fully closed

Kept fully open

Irrespective of any position

Kept 50% open

4

# Low specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above