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, belowI 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

Armature voltage control works for speeds _____ base speed and field r

1.	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, belowI 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
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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