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UPSC Civil Service Exam Questions

Q1: A pipeline of 5 cm diameter is reduced abruptly to 2.5 cm diameter at a section to enable measurement of the water flowing through it. The loss of head at the contraction is 0.5 m. Given that, in metric units, 2g = 4.43 and g = 3.132, the mean velocity in the reduced section will be

A 0.5 m/sec

B 1.1075 m/sec

C 1.566 m/sec

D 4.43 m/sec

ANS:D - 4.43 m/sec

Head loss due to contraction is;

Head loss = (0.5 * V2 square)/2g.



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