The armature resistance of a PMDC motor is 0.8 Ω.
At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1,500 rpm.
The efficiency of the motor while it is operating on load at 1,500 rpm drawing a current of 3.5 A from the same source will be
A. 0.48
B. 0.571
C. 0.592
D. 0.888
Show Answer
Answer: A
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