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A table fan rotating at a speed of 2400...

A table fan rotating at a speed of `2400` rpm is switched off and the resulting variation of the revolution/minute time is shown in Fig. The total number of revolutions of the fan before it comes to rest is

A

420

B

280

C

190

D

16800

Text Solution

Verified by Experts

The correct Answer is:
B
The corresponding (Rev/sec) graph is (Rev/sec)

Area under this curve gives the total number revolutions
`Delta = (1)/(2) (8)(30)+(10 xx8)+(16)(10)`
= 280 revolutions
D is only correct option
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RESONANCE-DAILY PRACTICE PROBLEM-DPP No.29
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