81. 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.
Hydraulic Machines MCQs
82. 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.
83. In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.
Correct
Incorrect
✅ The correct answer is option A.
84. In a Francis turbine runner, the number of blades are generally between
2 to 4
4 to 8
8 to l6
16 to 24
✅ The correct answer is option D.
85. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
Pelton wheel
Francis turbine
Kaplan turbine
none of these
✅ The correct answer is option B.
86. For 450 m head of water, __________ shallbeused.
Pelton wheel
Kaplan turbine
Francis turbine
none of these
✅ The correct answer is option A.
88. In a reciprocating pump, air vessels are used to
smoothen the flow
reduce suction head
increase delivery head
reduce acceleration he
✅ The correct answer is option D.
89. The cavitation in a hydraulic machine is mainly due to
low velocity
high velocity
low pressure
high pressure
✅ The correct answer is option C.
90. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
sum
difference
product
✅ The correct answer is option B.