4

# Kinematic 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

Have identical forces

A. Have identical velocities

4

1/√2

1/2

1

√2

4

Hydraulic

Mechanical

Overall

None of these

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

Centrifugal

Axial flow

Mixed flow

Reciprocating

4

# Indicator diagram of a reciprocating pump is a graph between

Flow vs. swept volume

Pressure in cylinder vs. swept volume

Flow vs. speed

Pressure vs. speed

4

# The undershot water wheels are those in which

The wheel runs entirely by the weight of water

The wheel runs entirely by the impulse of water

The wheel runs partly by the weight of water and partly by the impulse of water

None of the above

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

(W/p) × (A/a)

(p/W) × (a/A)

(W/p) × (a/A)

(p/W) × (A/a)

4

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

4

0 to 25 m

25 m to 250 m

Above 250 m

None of these

4

# A hydraulic coupling belongs to the category of

Power absorbing machines

Power developing machines

Energy transfer machines

Energy generating machines

4

# A turbine pump is basically a centrifugal pump equipped additionally with

Vaned diffusion casing

4

Low velocity

High velocity

Low pressure

High pressure

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

P/ √H

P/ H

P/ H3/2

P/ H²

4

# The Fourneyron turbine is _________ reaction turbine.

An axial flow

An inward flow

An outward flow

A mixed flow

4

Absolute velocity

Flow

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

# Casting of a centrifugal pump is designed so as to minimize

Friction loss

Cavitations

Loss of kinetic energy

4

# Kinematic 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

Have identical forces

4

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

Impulse turbines

Reaction turbines

Axial flow turbines

Mixed flow turbines

4

ηh = ηo × ηm

ηm = ηm × ηh

ηo = ηh × ηm

None of these

4

An axial flow

An inward flow

An outward flow

A mixed flow

4

175.4 r.p.m.

215.5 r.p.m.

241.5 r.p.m.

275.4 r.p.m

4

# Low specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

4

Product

Difference

Sum

None of these

4

Remain same

Increases

Decreases

None of these

4

N/√H

N/H

N/H3/2

N/H²

4

0.26

0.36

0.46

0.56