Question

What happens to the electromagnetic forces during the sudden short circuits at the line terminals?

(a) the electromagnetic forces get increased by 250 times the force under normal full load condition

(b) the electromagnetic forces get decreased by 250 times the force under normal full load condition

(c) the electromagnetic forces get increased by 200 times the force under normal full load condition

(d) the electromagnetic forces get decreased by 200 times the force under normal full load condition

This question was posed to me in an online interview.

I'm obligated to ask this question of Construction of Hydro-Generators topic in section Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right option is (a) the electromagnetic forces get increased by 250 times the force under normal full load condition

Explanation: The electromagnetic forces are directly proportional to the square of the current. It increases by 250 times the force under normal full load conditions.