1.

Considering a human handed control system for the dc motor speed control, if the resistance wire cut out too slowly, then the _____________(a) starting resistance would burn(b) field winding would burn(c) speed will rise steeply(d) any of the mentionedI had been asked this question in final exam.Question is taken from DC Motor Starting in section DC Motors of Electrical Machines

Answer»

Correct ANSWER is (a) starting resistance would burn

To EXPLAIN I would SAY: Due to the slow cut off the resistance the current will be high for a LARGE amount of TIME and it will cause the machine to burn.



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