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
Share your understanding of this question with the correct explanation.