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
✅ The correct answer is option D.
Hydraulic Machines MCQs
12. The specific speed of a hydraulic turbine depends upon
speed and power developed
discharge and power developed
speed and head of water
speed, power developed
✅ The correct answer is option D.
13. The flow ratio in case of Francis turbine varies from
0.15 to 0.3
0.4 to 0.5
0.6 to 0.9
1 to 1.5
✅ The correct answer is option A.
14. In a centrifugal pump, the regulating valve is provided on the
casing
delivery pipe
suction pipe
impeller
✅ The correct answer is option B.
15. The Thomson’s turbine is __________ reaction turbine.
an axial flow
an inward flow
an outward flow
a mixed flow
✅ The correct answer is option B.
16. The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine.
Yes
No
✅ The correct answer is option A.
17. In an inward flow reaction turbine
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 p
✅ The correct answer is option C.
18. The hydraulic efficiency of a reaction turbine, is the ratio of
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
✅ The correct answer is option C.
19. Which type of the pump is different from others in the same group?
Screw pump
Gear pump
Cam and piston pump
Plunger pump
✅ The correct answer is option D.
20. An impulse turbine is used for
low head of water
high head of water
medium head of water
high discharge
✅ The correct answer is option B.