Question

Under the condition for 3 phase alternator, maximum active power output, the delivered reactive power output is ________ while under maximum reactive power output, the delivered reactive power is ________

(a) negative, negative

(b) positive, negative

(c) negative, positive

(d) positive, positive

The question was posed to me during an internship interview.

I want to ask this question from Power Flow Through an Inductive Impedance in chapter Efficiency and Regulation of Electrical Machines

Answer 1

Right choice is (a) negative, negative

The explanation is: Under both the situation, there is need of reactive power which will set up the flux in the machine to make it run.