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By series parallel method of armature control how many different speeds are possible?

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By series parallel method of armature control how many different speeds are possible?

(a) 4

(b) 8

(c) 2

(d) Infinite

I got this question by my college professor while I was bunking the class.

I'm obligated to ask this question of Speed Control Using Armature Control in DC Motor in division DC Motors of DC Machines

1 Answer

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Best answer
The correct choice is (c) 2

Easiest explanation: Here two identical motors are coupled together mechanically to a common load. Two speeds at constant torque are possible in this method—one by connecting the motors armatures in series and the other by connecting them in parallel.

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