1.

For a dc machine, its commutator has a diameter of 50 c rotating at 1000 rpm. For a brush width of 1 cm, the time commutation taken by the machine will be _________

A. 0.382 ms
B. 0.456 ms
C. 0.573 ms
D. 0.312 ms
Answer» B. 0.456 ms


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