N√P / H3/2
N√P / H²
N√P / H5/4
N√P / H3
C. N√P / H5/4
Smoothen flow
Reduce acceleration to minimum
Increase pump efficiency
Save pump from cavitations
Net head
Absolute velocity
Blade velocity
Flow
Kinetic head
Velocity head
Manometric head
Static head
40 %
50 %
60 %
80 %
Centrifugal
Axial flow
Reciprocating
Mixed flow
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
Closed
Open
Depends on starting condition and flow desired
Could be either open or closed
P/ √H
P/ H
P/ H3/2
P/ H²
Horizontal
Nearly horizontal
Steep
First rise and then fall
Power produced by the turbine to the energy actually supplied by the turbine
Actual work available at the turbine to energy imparted to the wheel
Workdone on the wheel to the energy (or head of water) actually supplied to the turbine
None of the above
Normal speed
Unit speed
Specific speed
None of these
Low head of water
High head of water
Medium head of water
High discharge
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
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
39.2 %
48.8 %
84.8 %
88.4 %
Accumulating oil
Supplying large quantities of oil for very short duration
Generally high pressures to operate hydraulic machines
Supplying energy when main supply fails
Q = π.D.Vf
Q = π.b.Vf
Q = π.D.bf.V
Q = D.b.Vf
N√P / H3/2
N√P / H²
N√P / H5/4
N√P / H3
10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.
Product
Difference
Sum
None of these
Designing new impeller
Trimming the impeller size to the required size by machining
Not possible
Some other alterations in the impeller
Low head
High head
High head and low discharge
Low head and high discharge
Greater than 15°
Greater than 8°
Greater than 5°
Less than 8°
Same
0.75 B.H.P.
B.H.P./0.75
1.5 B.H.P.
To run the turbine full
To prevent air to enter the turbine
To increase the head of water by an amount equal to the height of the runner outlet above the tail race
To transport water to downstream
2V/(vr - v)
2V/(vr + v)
V/(vr - v)
V/(vr + v)
Friction loss
Cavitations
Static head
Loss of kinetic energy
Smoothen the flow
Reduce suction head
Increase delivery head
Reduce acceleration head
Two cylinders, two rams and a storage device
A cylinder and a ram
Two coaxial rams and two cylinders
A cylinder, a piston, storage tank and control valve
0.25 m3/s
0.5 m3/s
1.5 m3/s
2.5 m3/s