Question

Why it is advisable to use inductively wound diverter resistor?

(a) To make speed control on more range

(b) For long-life of machine

(c) Cost efficient

(d) To avoid oscillations in speed

I had been asked this question by my college director while I was bunking the class.

Query is from Speed Control Using Field Control of Series Motor topic in section DC Motors of DC Machines

Answer 1

Right answer is (d) To avoid oscillations in speed

The explanation is: One precaution to be taken in this method in order to avoid oscillations in speed initiated by load changes is to use an inductively wound diverter resistor. Thus, speed controlled output will vary smoothly when load is changed.