Question

For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is?

(a) 300

(b) 1200

(c) 900

(d) 600

This question was posed to me in semester exam.

Enquiry is from Synchronizing Power and Synchronizing Torque topic in chapter Synchronous Machine Stability of Electrical Machines

Answer 1

Right option is (a) 300

For explanation: P(sy, mech) = Poles* P(sy,ele)/2

             P(sy,ele) = 300 units.