A double overhung Pelton wheel has two jets two runners four jets four runners

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two runners

Hydraulic Machines problems

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4. Which of the following statement is wrong?
Options
A. The reaction turbines are used for low head and high discharge.
B. The angle of taper on draft tube is less than 8�.
C. An impulse turbine is generally fitted slightly above the tail race.
D. A Francis turbine is an impulse turbine.

5. The hydraulic efficiency of an impulse turbine is the
Options
A. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
B. ratio of the actual work available at the turbine to the energy imparted to the wheel
C. ratio of the work done on the wheel to the energy of the jet
D. none of the above

6. Mechanical efficiency of a centrifugal pump is the ratio of
Options
A. energy available at the impeller to the energy supplied to the pump by the prime mover
B. actual workdone by the pump to the energy supplied to the pump by the prime mover
C. energy supplied to the pump to the energy available at the impeller
D. manometric head to the energy supplied by the impeller per kN of water

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