The armature resistance of a permanent magnet dc motor is ___

The armature resistance of a permanent magnet dc motor is 0.8 Ohm.

At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm.

The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

A. 48.0%.
B. 57.1%.
C. 59.2%.
D. 88.8%.

Show Answer

Answer: A

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