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UPSC Civil Service Exam Questions - Engineering

Q1:

A grinding wheel rotates 3000 rpm. When power supply is cut off, the wheel stops completely in 10 seconds. What is the number of revolutions made by the wheel before coming to rest ?

A 3000

B 1000

C 500

D 250

ANS:D - 250

No. of revolution =
Pic value is (3000/60)x10 = 500.
At the end of rotation it's 0 (zero).
So average is (500+0)/2 = 250.