4

Casing

Delivery pipe

Suction pipe

Impeller

B. Delivery pipe

4

Decreases

Increases

Remain same

None of these

4

0.15 to 0.3

0.4 to 0.5

0.6 to 0.9

1 to 1.5

4

0.25 m3/s

0.5 m3/s

1.5 m3/s

2.5 m3/s

4

# The working of which of the following hydraulic units is based on Pascal's law?

Air lift pump

Jet pump

Hydraulic coupling

Hydraulic press

4

# Head developed by a centrifugal pump is

Proportional to diameter of impeller

Proportional to speed of impeller

Proportional to diameter and speed of impeller

None of the above

4

# A Pelton wheel is

Tangential flow impulse turbine

Inward flow impulse turbine

Outward flow impulse turbine

Inward flow reaction turbine

4

(W/p) × (A/a)

(p/W) × (a/A)

(W/p) × (a/A)

(p/W) × (A/a)

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

# The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump 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 axial flow at outlet

4

# Medium specific speed of a pump implies it is

Centrifugal pump

Mixed flow pump

Axial flow pump

Any one of the above

4

P/ √H

P/ H

P/ H3/2

P/ H²

4

# The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

Manometric efficiency

Mechanical efficiency

Overall efficiency

Volumetric efficiency

4

Equal to

1.2 times

1.8 times

Double

4

Two jets

Two runners

Four jets

Four runners

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

High discharge

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

Normal speed

Unit speed

Specific speed

None of these

4

# Puck up the wrong statement about centrifugal pump

Discharge a diameter

Power a speed⁴

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

# The discharge through a turbine is

Directly proportional to H1/2

Inversely proportional to H1/2

Directly proportional to H3/2

Inversely proportional to H3/2

4

# The discharge through a reaction turbine with increase in unit speed

Increases

Decreases

Remain unaffected

First increases and then decreases

4

Centrifugal

Axial flow

Reciprocating

Mixed flow

4

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

Vaned diffusion casing

4

[wa (V - v)]/2g

[wa (V - v)]/g

[wa (V - v)²]/2g

[wa (V - v²)]/g

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

(N√Q)/H2/3

(N√Q)/H3/4

(N√Q)/H

(N√Q)/H5/4

4

10-15°

20-25°

30-40°

50-60°

4

Pelton wheel

Kaplan turbine

Francis turbine

None of these