0.50 to 0.65
0.65 to 0.75
0.75 to 0.85
0.85 to 0.90
D. 0.85 to 0.90
One-half
One-third
Two-third
Three-fourth
39.2 %
49.2 %
68.8 %
84.8 %
Smoothen flow
Reduce acceleration to minimum
Increase pump efficiency
Save pump from cavitations
High discharge
High head
Pumping of viscous fluids
High head and high discharge
Centrifugal pump
Axial flow pump
Mixed flow pump
Reciprocating pump
Centrifugal pump
Reciprocating pump
Jet pump
Air lift pump
Designing new impeller
Trimming the impeller size to the required size by machining
Not possible
Some other alterations in the impeller
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
Greater than 15°
Greater than 8°
Greater than 5°
Less than 8°
Volute casing
Volute casing with guide blades
Vortex casing
Any one of these
High initial and maintenance cost
Lower discharge
Lower speed of operation
Necessity of air vessel
Adjustable blades
Backward curved blades
Vaned diffusion casing
Inlet guide blades
Straight
Bent forward
Bent backward
Radial
Directly as fan speed
Square of fan speed
Cube of fan speed
Square root of fan speed
0.25 kW
0.75 kW
1.75 kW
3.75 kW
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
Screw pump
Gear pump
Cam and piston pump
Plunger pump
One-fourth
One-half
Three-fourth
Double
Waste valve closes suddenly
Supply pipe is long
Supply pipe is short
Ram chamber is large
Radially, axially
Axially, radially
Axially, axially
Radially, radially
Accumulating oil
Supplying large quantities of oil for very short duration
Generally high pressures to operate hydraulic machines
Supplying energy when main supply fails
In an impulse turbine, the water impinges on the buckets with pressure energy.
In a reaction turbine, the water glides over the moving vanes with kinetic energy.
In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.
10° to 15°
15° to 20°
20° to 25°
25° to 30°
L.A.N
2 L.A.N
(L.A.N)/60
(2 L.A.N)/60
Ratio of diameters
Square of ratio of diameters
Inverse ratio of diameters
Square of inverse ratio of diameters
Kept fully closed
Kept fully open
Irrespective of any position
Kept 50% open
Low head of water
High head of water
Medium head of water
High discharge
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
2 to 4
4 to 8
8 to 16
16 to 24
Directly proportional to N
Inversely proportional to N
Directly proportional to N²
Inversely proportional to N²