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The armature resistance of a permanent magnet dc motor is 0.8 2. At no load, the motor draws 1.5 A from a supply voltage
The armature resistance of a permanent magnet dc motor is 0.8 2. 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% (C) 59.2% (B) 57.1% (D) 88.8%
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Electric Machinery
Authors: Charles Kingsley, Jr, Stephen D. Umans
6th Edition
71230106, 9780073660097, 73660094, 978-0071230100
