4

Centrifugal

Axial flow

Reciprocating

Mixed flow

B. Axial flow

4

1/√2

1/2

1

√2

4

# In a centrifugal pump casing, the flow of water leaving the impeller, is

Rectilinear flow

Free vortex motion

Forced vortex

4

39.2 %

48.8 %

84.8 %

88.4 %

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

# Which type of the pump is different from others in the same group?

Screw pump

Gear pump

Cam and piston pump

Plunger pump

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

# Head developed by a centrifugal pump depends on

Impeller diameter

Speed

Fluid density

Both (A) and (B) above

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

(N√Q)/H2/3

(N√Q)/H3/4

(N√Q)/H

(N√Q)/H5/4

4

Equal to

1.2 times

1.8 times

Double

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

# The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. 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 mixed flow at outlet

4

(W/p) × (A/a)

(p/W) × (a/A)

(W/p) × (a/A)

(p/W) × (A/a)

4

# Geometric 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

Remain same

Increases

Decreases

None of these

4

# In a reciprocating pump, air vessels are used to

Smoothen the flow

4

# Which of the following pump is suitable for small discharge and high heads?

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

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

High discharge

4

Sum

Difference

Product

None of these

4

2 to 4

4 to 8

8 to 16

16 to 24

4

# Multistage centrifugal pumps are used to

Give high discharge

Pump viscous fluids

All of these

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

# The function of guide vanes in a reaction turbine is to

Allow the water to enter the runner without shock

Allow the water to flow over them, without forming eddies

Allow the required quantity of water to enter the turbine

All of the above

4

# The hydraulic efficiency of an impulse turbine is the

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

[wa (V - v)]/2g

[wa (V - v)]/g

[wa (V - v)²]/2g

[wa (V - v²)]/g

4

N√P / H3/2

N√P / H²

N√P / H5/4

N√P / H3

4

An axial flow

An inward flow

An outward flow

A mixed flow

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