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Armature voltage control works for speeds _____ base speed and field resistance control works well for speed _____ base speed.

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Armature voltage control works for speeds _____ base speed and field resistance control works well for speed _____ base speed.

(a) below, above

(b) above, below

(c) above, above

(d) below, below

I had been asked this question in a national level competition.

This question is from Speed Control of DC Motors topic in division DC Motors of Electrical Machines

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Best answer
Right answer is (a) below, above

The explanation: For armature voltage control, armature current is increased so as to reduce speed below base speed. In field control flux is reduced so the speed would be above base speed.

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