Question

The basic torque and EMF expression of rotating electrical machines are ____________

(a) applicable to DC machines only

(b) applicable to AC machines only

(c) applicable to both AC and DC machines

(d) none of the mentioned

This question was posed to me in final exam.

Question is taken from Torque Production and Dynamic Equations in chapter Basic Concepts in Rotating Machines of Electrical Machines

Answer 1

Right choice is (c) applicable to both AC and DC machines

For explanation I would say: Basic torque and EMF expressions are same for both AC and DC machines as the fundamental principles underlying the operation of AC and DC machines are same.