Question

In a 3-phase induction generator which is self excited, load has been increased. To keep the frequency of the generated voltage constant, speed of the induction machine should be _________

(a) increased

(b) decreased

(c) maintained less than rated synchronous speed

(d) maintained more than rated synchronous speed

I got this question during an internship interview.

Question is taken from Equivalent Circuit topic in section Induction Machines of Electrical Machines

Answer 1

Right option is (a) increased

For explanation: Frequency should be increased to maintain the speed constant.