Slow speed pump with radial flow at outlet
Medium speed pump with radial flow at outlet
High speed pump with radial flow at outlet
High speed pump with axial flow at outlet
A. Slow speed pump with radial flow at outlet
One-fourth
One-half
Three-fourth
Double
At full load
At which there will be no damage to the runner
Corresponding to maximum overload permissible
At which the turbine will run freely without load
The reaction turbines are used for low head and high discharge.
The angle of taper on draft tube is less than 8°.
An impulse turbine is generally fitted slightly above the tail race.
A Francis turbine is an impulse turbine.
Fourneyron turbine
Journal turbine
Thomson's turbine
Pelton wheel
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
Increases
Decreases
Remain unaffected
First increases and then decreases
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
L.A.N
2 L.A.N
(L.A.N)/60
(2 L.A.N)/60
(w Hm) / (Q × ηo)
(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm
2 to 4
4 to 8
8 to 16
16 to 24
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
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
Manometric efficiency
Mechanical efficiency
Overall efficiency
Volumetric efficiency
High initial and maintenance cost
Lower discharge
Lower speed of operation
Necessity of air vessel
Two
Four
Six
Eight
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
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
Tangential flow impulse turbine
Inward flow impulse turbine
Outward flow impulse turbine
Inward flow reaction turbine
An axial flow
An inward flow
An outward flow
A mixed flow
Smoothen the flow
Reduce suction head
Increase delivery head
Reduce acceleration head
Inlet of draft rube
Blade inlet
Guide blade
Penstock
102 watts
75 watts
550 watts
735 watts
0.50 to 0.65
0.65 to 0.75
0.75 to 0.85
0.85 to 0.90
Directly as the air or gas density
Inversely as square root of density
Inversely as density
As square of density
0.25 kW
0.75 kW
1.75 kW
3.75 kW
Low head
High head
High head and low discharge
Low head and high discharge
Pelton wheel with one nozzle
Pelton wheel with two or more nozzles
Kaplan turbine
Francis turbine
The centrifugal pump is suitable for large discharge and smaller heads.
The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
The efficiency of centrifugal pump is less as compared to reciprocating pump.
All of the above
Directly proportional
Inversely proportional
4th power
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