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An electric motor operating on a `60 V` dc supply draws a currrent of `10A`. If the effeciency of the motor is `50%`, the resistance of its winding isA. `3Omega`B. `6Omega`C. `15Omega`D. `30Omega` |
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Answer» Correct Answer - A Efficiency `eta=50%` so `e=E//2` and `i=(E-e)/(R ) impliesi=(E-E//2)/(R )=(E)/(2R)` `impliesR=(E)/2i)=(60)/(2xx10)=3Omega` |
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