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UPSC Civil Service Exam Questions - Engineering

Q1:

A motor shaft rotating with a speed of 90 rpm decelerates uniformly when the motor is switched off and stops in 40 sec. The number of revolutions made by the shaft in this time would be

A 10

B 20

C 304

D 40

ANS:C - 304

(0 + 90) /2 = 45 rpm.
N = 45 * 40 sec/60 sec,
= 30.