(w Hm) / (Q × ηo)
(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm
B. (w Hm Q) / ηo
One-fourth
One-half
Three-fourth
Double
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
Manometric efficiency
Mechanical efficiency
Overall efficiency
Volumetric efficiency
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.
Adjustable blades
Backward curved blades
Vaned diffusion casing
Inlet guide blades
10-15°
20-25°
30-40°
50-60°
(1 + cos φ)/2
(1 - cos φ)/2
(1 + sin φ)/2
(1 - sin φ)/2
Full load speed
The speed at which turbine runner will be damaged
The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
The speed corresponding to maximum overload permissible
Discharge a diameter
Head a speed²
Head a diameter
Power a speed⁴
(W/p) × (A/a)
(p/W) × (a/A)
(W/p) × (a/A)
(p/W) × (A/a)
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
Decreases
Increases
Remain same
None of these
Smoothen the flow
Reduce suction head
Increase delivery head
Reduce acceleration head
Allow the water to enter the runner without shock
Allow the water to flow over them, without forming eddies
Allow the required quantity of water to enter the turbine
All of the above
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
2V/(vr - v)
2V/(vr + v)
V/(vr - v)
V/(vr + v)
Centrifugal
Axial flow
Mixed flow
Reciprocating
High initial and maintenance cost
Lower discharge
Lower speed of operation
Necessity of air vessel
Volute casing
Volute casing with guide blades
Vortex casing
Any one of these
Directly proportional to diameter of its impeller
Inversely proportional to diameter of its impeller
Directly proportional to (diameter)² of its impeller
Inversely proportional to (diameter)² of its impeller
Centrifugal pump
Reciprocating pump
Jet pump
Air lift pump
Directly proportional to N
Inversely proportional to N
Directly proportional to N²
Inversely proportional to N²
175.4 r.p.m.
215.5 r.p.m.
241.5 r.p.m.
275.4 r.p.m
39.2 %
49.2 %
68.8 %
84.8 %
Directly proportional
Inversely proportional
4th power
None of these
Directly as fan speed
Square of fan speed
Cube of fan speed
Square root of fan speed
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
Centrifugal
Axial flow
Reciprocating
Mixed flow
10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.
(w Hm) / (Q × ηo)
(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm