Question

A chopper behaves as a __________

(a) DC equivalent of AC switching device

(b) DC equivalent of AC transformer

(c) DC equivalent of AC relay

(d) AC equivalent of circuit breaker

This question was posed to me in an international level competition.

My question is based upon Modified Speed Torque Characteristics of DC Shunt Motors topic in division Characteristics of DC & AC Motors of Electric Drives

Answer 1

The correct answer is (b) DC equivalent of AC transformer

Easiest explanation: A chopper is used to step up or step down the DC voltage whereas the transformer is used to step up or step down AC voltage so chopper is DC equivalent of AC transformer.