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VITEEE 2014 Solved Paper
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© examsnet.com
Question : 4
Total: 120
An installation consisting of an electric motor driving a water pump left 75 L of water per second to a height of 4.7 m.If the motor consumes a power of 5 kW, then the efficiency of the installation is
39%
69%
93%
96%
Validate
Solution:
Power consumed by motor = 5 kW = 5 x 10 3 W= 5000W
Power used in lifting water =
m
g
h
t
= 7.5 x 9.8 x 4.7 = 3454.5 kW
Efficiency =
Power
used
Power
consumed
× 100 %
=
3454.5
5000
× 100 = 69%
© examsnet.com
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