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The speed of a dc motor can be controlled by the variation of
1. armature voltage. 2. field current. 3. armature circuit
resistance. 4. angle of brush shift.
Which of the statements given above are correct?
(a) 1,2 and 3 (b) 2,3 and 4
(c) 1,3 and 4 (d) 1,2 and 4
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