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Water is pumped by a motor-pump unit from a lake to a storage tank 17 m...

Water is pumped by a motor-pump unit from a lake to a storage tank 17 m above at a rate of
120 L/s. The storage tank is open to the atmosphere. The motor consumes 25 kW of electric power
and the motor effciency is 95%. Disregarding any changes in kinetic energy of the water, determine
(a) the overall effciency of the pump-motor unit, (b) the effciency of the pump and (c) the shaft
power supplied by the motor to the pump. The density of water is 1000 kg/m3, the gravitational
acceleration is 9.81 m/s2.

Engineering   Chemical-Engineering   
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