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Question

A 10-hp, 230 V, 60 Hz, three-phase, Y-connected synchronous motor drives full load at a power factor of 0.707 leading. The synchronous impedance of the motor is j5 Ω/phase. The rotational loss is 230 W and field winding loss is 70 W. The efficiency of the motor is______ %. (Assume 1 hp = 746 W)
  1. 96.1

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Solution

The correct option is A 96.1
The power output, P0=10×746=7460 W

The power developed, Pd=P0+Pr=7460+230=7690 W

Total power input:Pin=7690+70=7760 W

Efficiency,η=PoutputPinput=74607760=0.961 (or)=96.1%

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