4

# In an outward 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

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

4

Two jets

Two runners

Four jets

Four runners

4

# Low specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one 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

Equal to

1.2 times

1.8 times

Double

4

# Air vessels in reciprocating pump are used to

Smoothen flow

Reduce acceleration to minimum

Increase pump efficiency

Save pump from cavitations

4

1/√2

1/2

1

√2

4

# High specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

None of the above

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

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

4

Product

Difference

Sum

None of these

4

10° to 15°

15° to 20°

20° to 25°

25° to 30°

4

Strain

Pressure

Kinetic

None of these

4

# High specific speed of a pump implies it is

Centrifugal pump

Mixed flow pump

Axial flow pump

Any one of the above

4

# If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

Geometric similarity

Kinematic similarity

Dynamic similarity

None of these

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 cavitation in reaction turbines is avoided, to a great extent by

Installing the turbine below the tail race level

Using stainless steel runner of the turbine

Providing highly polished blades to the runner

All of the above

4

# Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

4

# A hydraulic accumulator normally consists of

Two cylinders, two rams and a storage device

A cylinder and a ram

Two coaxial rams and two cylinders

A cylinder, a piston, storage tank and control valve

4

# In an outward 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

# 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

[wa (V - v)]/2g

[wa (V - v)]/g

[wa (V - v)²]/2g

[wa (V - v²)]/g

4

High discharge

4

Low velocity

High velocity

Low pressure

High pressure

4

# Manometric head, in case of a centrifugal pump, is equal to

Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe

Workdone per kN of water Losses within the impeller

Energy per kN at outlet of impeller Energy per kN at inlet of impeller

All of the above

4

Absolute velocity

Flow

4

N/√H

N/H

N/H3/2

N/H²

4

# The mechanical efficiency of an impulse turbine is

Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

Ratio of the actual work available at the turbine to the energy imparted to the wheel

Ratio of the Work done on the wheel to the energy of the jet

None of the above

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

One-fourth

One-half

Three-fourth

Double