Question

Which of the following is the plugging method of braking?

(a) Reversal of field connections

(b) Reversal of armature connections

(c) Addition of equal and opposite field

(d) Removal of field circuit from current machine circuit

This question was addressed to me in an interview for internship.

The doubt is from Braking of DC Motors topic in portion DC Motors of DC Machines

Answer 1

The correct choice is (b) Reversal of armature connections

The best explanation: Plugging is method where connections are reversed at a given instant. Because of the problem of interrupting highly inductive field current and the time needed for the field current to build up in opposite direction, it is a common practice to reverse armature connections.