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

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

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

Volute casing

Volute casing with guide blades

Vortex casing

Any one of these

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

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

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

^{3/2}

N√P / H²

^{5/4}

^{3}

Two

Four

Six

Eight

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

waV / 2g

waV / g

waV² / 2g

waV² / g

2 to 4

4 to 8

8 to 16

16 to 24

24.8 r.p.m.

48.2 r.p.m

82.4 r.p.m.

248 r.p.m

High discharge

High head

Pumping of viscous fluids

High head and high discharge

Ratio of diameters

Square of ratio of diameters

Inverse ratio of diameters

Square of inverse ratio of diameters

Closed

Open

Depends on starting condition and flow desired

Could be either open or closed

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

6

8

12

39.2 %

49.2 %

68.8 %

84.8 %

Air lift pump

Jet pump

Hydraulic coupling

Hydraulic press

Medium head application from 24 to 180 m

Low head installation up to 30 m

High head installation above 180 m

All types of heads

Centrifugal

Axial flow

Mixed flow

Reciprocating

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

Kept fully closed

Kept fully open

Irrespective of any position

Kept 50% open

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

Impeller diameter

Speed

Fluid density

Both (A) and (B) above

Friction loss

Cavitations

Static head

Loss of kinetic energy

Same quantity of liquid

0.75 Q

Q/0.75

1.5 Q

Radially, axially

Axially, radially

Axially, axially

Radially, radially

0.26

0.36

0.46

0.56

Low velocity

High velocity

Low pressure

High pressure