A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is
Options
A. 10 r.p.m.
B. 20 r.p.m.
C. 40 r.p.m.
D. 80 r.p.m.
Correct Answer
20 r.p.m.
Hydraulic Machines problems
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1. The hydraulic efficiency of a reaction turbine, is the ratio of
Options
A. power produced by the turbine to the energy actually supplied by the turbine
B. actual work available at the turbine to energy imparted to the wheel
C. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
5. The force exerted (in newton) by a jetof water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m2, and V = Velocity of jet in m/s)
Correct Answer: speed, power developed and head of water
10. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ?o = Overall efficiency of the pump)
