4
6
8
12
B. 6
102 watts
75 watts
550 watts
735 watts
Directly as fan speed
Square of fan speed
Cube of fan speed
Square root of fan speed
Normal speed
Unit speed
Specific speed
None of these
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
One-fourth
One-half
Three-fourth
Double
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
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
Radially, axially
Axially, radially
Axially, axially
Radially, radially
24.8 r.p.m.
48.2 r.p.m
82.4 r.p.m.
248 r.p.m
Centrifugal pump
Reciprocating pump
Jet pump
Air lift pump
Double
Three times
Four times
Five times
Net head
Absolute velocity
Blade velocity
Flow
Low velocity
High velocity
Low pressure
High pressure
(N√Q)/H2/3
(N√Q)/H3/4
(N√Q)/H
(N√Q)/H5/4
Lift and resultant force
Drag and resultant force
Lift and tangential force
Lift and drag
Give high discharge
Produce high heads
Pump viscous fluids
All of these
39.2 %
49.2 %
68.8 %
84.8 %
Two jets
Two runners
Four jets
Four runners
Waste valve closes suddenly
Supply pipe is long
Supply pipe is short
Ram chamber is large
0 to 25 m
25 m to 250 m
Above 250 m
None of these
10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.
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
Energy available at the impeller to the energy supplied to the pump by the prime mover
Actual workdone by the pump to the energy supplied to the pump by the prime mover
Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water
High discharge
High head
Pumping of viscous fluids
High head and high discharge
(D/2d) + 5
(D/2d) + 10
(D/2d) + 15
(D/2d) + 20
2 to 4
4 to 8
8 to 16
16 to 24
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
Propeller turbine
Francis turbine
Impulse turbine
Any one of the above
Kept fully closed
Kept fully open
Irrespective of any position
Kept 50% open
Directly as the air or gas density
Inversely as square root of density
Inversely as density
As square of density