4

# The flow rate in gear pump

Increases with increase in pressure

Decreases with increase in pressure

More or less remains constant with increase in pressure

Unpredictable

C. More or less remains constant with increase in pressure

4

(N√Q)/H2/3

(N√Q)/H3/4

(N√Q)/H

(N√Q)/H5/4

4

39.2 %

49.2 %

68.8 %

84.8 %

4

# Centrifugal pump is started with its delivery valve

Kept fully closed

Kept fully open

Irrespective of any position

Kept 50% open

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

39.2 %

48.8 %

84.8 %

88.4 %

4

# The specific speed of turbine is defined as the speed of a unit

Of such a size that it delivers unit discharge at unit head

Of such a size that it delivers unit discharge at unit power

Of such a size that it requires unit power per unit head

Of such a size that it produces unit horse power with unit head

4

# Low specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

4

# The power produced by the reaction turbine is ________ to the head of water.

Directly proportional

Inversely proportional

4th power

None of these

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

# Puck up the wrong statement about centrifugal pump

Discharge a diameter

Power a speed⁴

4

Remain same

Increases

Decreases

None of these

4

# The flow ratio of Francis turbine is defined as the ratio of the

Velocity of flow at inlet to the theoretical jet velocity

Theoretical velocity of jet to the velocity of flow at inlet

Velocity of runner at inlet to the velocity of flow at inlet

None of the above

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

# 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

# Multistage centrifugal pumps are used to

Give high discharge

Pump viscous fluids

All of these

4

P/ √H

P/ H

P/ H3/2

P/ H²

4

[wa (V - v)]/2g

[wa (V - v)]/g

[wa (V - v)²]/2g

[wa (V - v²)]/g

4

Pelton wheel

Kaplan turbine

Francis turbine

None of these

4

# A hydraulic ram is a device used to

Store the energy of water

Increase the pressure of water

To lift water from deep wells

To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

4

# Which of the following statement is correct?

In an impulse turbine, the water impinges on the buckets with pressure energy.

In a reaction turbine, the water glides over the moving vanes with kinetic energy.

In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.

In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

4

# Which of the following statement is wrong?

The reaction turbines are used for low head and high discharge.

The angle of taper on draft tube is less than 8°.

An impulse turbine is generally fitted slightly above the tail race.

A Francis turbine is an impulse turbine.

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

# Which of the following pump is generally used to pump highly viscous fluid?

Centrifugal pump

Reciprocating pump

Air lift pump

Screw pump

4

Strain

Pressure

Kinetic

None of these

4

Two jets

Two runners

Four jets

Four runners

4

One-fourth

One-half

Three-fourth

Double

4

Axial

Centrifugal

Vortex