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Which of the following is not the method of speed control in DC series motor?

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Which of the following is not the method of speed control in DC series motor?

(a) Diverter

(b) Tapped-field control

(c) Variable resistance in series with armature

(d) Series- parallel control

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The correct option is (c) Variable resistance in series with armature

To elaborate: Diverter means adding a variable resistance in parallel with field winding. Tapped field control is the method where field ampere turns are adjusted in steps by varying the number of turns included in the circuit. In series parallel method field winding is connected so that it will form two parts.

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