Q = π.D.Vf
Q = π.b.Vf
Q = π.D.bf.V
Q = D.b.Vf
C. Q = π.D.bf.V
N/√H
N/H
N/H3/2
N/H²
Kept fully closed
Kept fully open
Irrespective of any position
Kept 50% open
Propeller turbine
Francis turbine
Impulse turbine
Any one of the above
Normal speed
Unit speed
Specific speed
None 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
0.15 to 0.3
0.4 to 0.5
0.6 to 0.9
1 to 1.5
An axial flow
An inward flow
An outward flow
A mixed flow
Impeller diameter
Speed
Fluid density
Both (A) and (B) above
10° to 15°
15° to 20°
20° to 25°
25° to 30°
At the top
At the bottom
At the canter
From sides
Centrifugal pump
Mixed flow pump
Axial flow pump
Any one of the above
Casing
Delivery pipe
Suction pipe
Impeller
39.2 %
49.2 %
68.8 %
84.8 %
Two jets
Two runners
Four jets
Four runners
(W/p) × (A/a)
(p/W) × (a/A)
(W/p) × (a/A)
(p/W) × (A/a)
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
The suction pressure should be high
The delivery pressure should be high
The suction pressure should be low
The delivery pressure should be low
High initial and maintenance cost
Lower discharge
Lower speed of operation
Necessity of air vessel
One-fourth
One-half
Three-fourth
Double
Hydraulic
Mechanical
Overall
None of these
0.50 to 0.65
0.65 to 0.75
0.75 to 0.85
0.85 to 0.90
0.25 kW
0.75 kW
1.75 kW
3.75 kW
Centrifugal pump
Reciprocating pump
Jet pump
Airlift pump
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
24.8 r.p.m.
48.2 r.p.m
82.4 r.p.m.
248 r.p.m
4
6
8
12
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
Directly as fan speed
Square of fan speed
Cube of fan speed
Square root of fan speed
Diameter of jet to the diameter of Pelton wheel
Velocity of jet to the velocity of Pelton wheel
Diameter of Pelton wheel to the diameter of jet
Velocity of Pelton wheel to the velocity of jet
10-15°
20-25°
30-40°
50-60°