Question

For very sensitive and wide speed control, which of the following method is preferred?

(a) Armature control

(b) Ward-Leonard control

(c) Multiple voltage control

(d) Field control

This question was addressed to me at a job interview.

The question is from DC Motor Basics -2 topic in chapter DC Motors of DC Machines

Answer 1

The correct answer is (b) Ward-Leonard control

For explanation I would say: In ward-Leonard method, by using big circuitry, very fine speed control over the whole range from zero to normal speed and that too in both directions can be obtained. The motor-generator set can provide speed both below and above the rated speed and in both direction, by this method.