Question

The variation in terminal voltage of DC shunt generator with respect to variation in separately excited DC generator is ___________

(a) Much rapid

(b) Much slower

(c) Remains constant

(d) Can’t say

I got this question during an interview for a job.

The above asked question is from Characteristics of Separately Excited Generators topic in chapter DC Generator of DC Machines

Answer 1

The correct option is (a) Much rapid

To explain I would say: The terminal voltage drops off much more rapidly with load in a shunt generator than in a separately-excited generator because of fall in field current with terminal voltage. The external characteristic is a double-valued curve with a certain IL (max).