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
D. All of the above
Propeller turbine
Francis turbine
Impulse turbine
Any one of the above
Straight
Bent forward
Bent backward
Radial
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
Rotational flow
Radial
Forced spiral vortex flow
Spiral vortex flow
Increases with increase in pressure
Decreases with increase in pressure
More or less remains constant with increase in pressure
Unpredictable
Same quantity of liquid
0.75 Q
Q/0.75
1.5 Q
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
Remain same
Increases
Decreases
None of these
39.2 %
49.2 %
68.8 %
84.8 %
Radial
Axial
Centrifugal
Vortex
At the top
At the bottom
At the canter
From sides
waV / 2g
waV / g
waV² / 2g
waV² / g
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
Slow speed with radial flow at outlet
Medium speed with radial flow at outlet
High speed with radial flow at outlet
High speed with mixed flow at outlet
Directly as fan speed
Square of fan speed
Cube of fan speed
Square root of fan speed
Air lift pump
Jet pump
Hydraulic coupling
Hydraulic press
Installing the turbine below the tail race level
Using stainless steel runner of the turbine
Providing highly polished blades to the runner
All of the above
Directly proportional to N
Inversely proportional to N
Directly proportional to N²
Inversely proportional to N²
No flow will take place
Cavitation will be formed
Efficiency will be low
Excessive power will be consumed
Q/√H
Q/H
Q/H3/2
Q/H²
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
Hydraulic
Mechanical
Overall
None of these
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
Sum
Difference
Product
None of these
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
Same
0.75 B.H.P.
B.H.P./0.75
1.5 B.H.P.
Designing new impeller
Trimming the impeller size to the required size by machining
Not possible
Some other alterations in the impeller
(D/2d) + 5
(D/2d) + 10
(D/2d) + 15
(D/2d) + 20
P/ √H
P/ H
P/ H3/2
P/ H²
(1 + cos φ)/2
(1 - cos φ)/2
(1 + sin φ)/2
(1 - sin φ)/2