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

D. High speed with axial flow at outlet

4

# A hydraulic press is a device used

To store pressure energy which may be supplied to a machine later on

To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure

To lift larger load by the application of a comparatively much smaller force

All of the above

4

# Slip of a reciprocating pump is defined as the

Ratio of actual discharge to the theoretical discharge

Sum of actual discharge and the theoretical discharge

Difference of theoretical discharge and the actual discharge

Product of theoretical discharge and the actual discharge

4

Volute casing

Vortex casing

Any one of these

4

# Which of the following statement is correct as regard to water wheels?

They have slow speeds

They are suitable even for low water heads

They give constant efficiency, even if the discharge is not constant

All 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

# 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

N√P / H3/2

N√P / H²

N√P / H5/4

N√P / H3

4

Two

Four

Six

Eight

4

# The cavitation in a hydraulic machine

Causes noise and vibration of various parts

Reduces the discharge of a turbine

Causes sudden drop in power output and efficiency

All of the above

4

waV / 2g

waV / g

waV² / 2g

waV² / g

4

2 to 4

4 to 8

8 to 16

16 to 24

4

24.8 r.p.m.

48.2 r.p.m

82.4 r.p.m.

248 r.p.m

4

# Multistage centrifugal pumps are used to obtain

High discharge

Pumping of viscous fluids

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

# For starting an axial flow pump, its delivery valve should be

Closed

Open

Depends on starting condition and flow desired

Could be either open or closed

4

# Braking jet in an impulse turbine is used

To break the jet of water

To bring the runner to rest in a short time

To change the direction of runner

None of these

4

4

6

8

12

4

39.2 %

49.2 %

68.8 %

84.8 %

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

# Francis turbine is best suited for

Medium head application from 24 to 180 m

Low head installation up to 30 m

High head installation above 180 m

4

Centrifugal

Axial flow

Mixed flow

Reciprocating

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

# 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 preferred for flood control and irrigation applications?

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

4

# Head developed by a centrifugal pump depends on

Impeller diameter

Speed

Fluid density

Both (A) and (B) above

4

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

Friction loss

Cavitations

Loss of kinetic energy

4

# If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

Same quantity of liquid

0.75 Q

Q/0.75

1.5 Q

4

Axially, axially

4

0.26

0.36

0.46

0.56