91. The number of buckets on the periphery of a Pelton wheel is given by
✅ The correct answer is option C.
Hydraulic Machines MCQs
92. A hydraulic press is a device used
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
✅ The correct answer is option C.
93. A Kaplan turbine is an axial flow reaction turbine.
Correct
Incorrect
✅ The correct answer is option A.
94. The efficiency of a reaction turbine for a given head __________ with the increase in speed.
decreases
increases
✅ The correct answer is option A.
95. Mechanical efficiency of a centrifugal pump is the ratio of
energy available at the impeller to the energy supplied to the pump by the prime mover
actual workdone by the pump to the energy supplied to the pump by the prime mover
energy supplied to the pump to the energy available at the impeller
manometric head to the
✅ The correct answer is option A.
97. The head available at the inlet of the turbine is known as net or effective head.
Correct
Incorrect
✅ The correct answer is option A.
98. The overall efficiency for a Pelton wheel lies between
0.50 to 0.65
0.65 to 0.75
0.75 to 0.85
0.85 to 0.90
✅ The correct answer is option D.
99. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Agree
Disagree
✅ The correct answer is option A.
100. If the ratio’s of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
geometric similarity
kinematic similarity
dynamic similarity
none of these
✅ The correct answer is option C.