Question

If the emf from the air gap line is the 3-phase alternator is 440V per phase and armature current is 110 A. The synchronous reactance is?

(a) 4 ohms

(b) 2 ohms

(c) 6.92 ohms

(d) 2.32 ohms

This question was posed to me at a job interview.

Query is from Voltage Regulation of an Alternator in section Synchronous Generators of Electrical Machines

Answer 1

Correct choice is (a) 4 ohms

To elaborate: Z = V/I = 440/110 = 4 ohms.