A quarter horse power motor runs at a speed of 600   rpm . Assuming 60 % efficiency, the work done by…

A quarter horse power motor runs at a speed of 600 rpm. Assuming 60% efficiency, the work done by the motor in one rotation is
  1. 7.46 J
  2. 74.6 J
  3. 111.9 J
  4. 11.19 J

Solution

Given, the power, P=14hp=7464=186.5 W

Effective power⇒P'=186.6×60100=111.9 W

Angular velocity, ω=2π×60060=20π

Work done in one rotation=111.9×2π20π=11.19 J

Asked in: AP EAMCET 2021 (19 Aug Shift 2)

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