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There is an application which required pulsating loads, punch presses. The most preferred machines would be __________

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There is an application which required pulsating loads, punch presses. The most preferred machines would be __________

(a) compound dc machine

(b) series dc machine

(c) shunt dc machine

(d) all of the mentioned

This question was posed to me in exam.

This interesting question is from DC Machine Applications topic in division DC Machines of Electrical Machines

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Right answer is (a) compound dc machine

The explanation is: It is compound machine whose flux can varied higher as well as lower in order to have variable torques.

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