dc machines, Electrical Engineering

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what is working of dc machines?

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Dc machines, commutator in d.c machine acts as... what????

commutator in d.c machine acts as... what????

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Regenerative Braking Control In this  methods  motor  behaves like a  generator  and the kinetic energy of the  motor  and connected load is  returned to the supply. If means

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Q. A 230-Vdc shuntmotor delivers 30 hp at the shaft at 1120 r/min. If the motor has an efficiency of 87% at this load, find: (a) The total input power. (b) The line current.

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