For a dc machine , its commutator has a diameter of 50 c rotating at 1 – McqOptions

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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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