Question

In a synchronous machine, salient pole construction has been found to suit best for ___________

(a) low speed prime movers

(b) high speed prime movers

(c) medium speed prime movers

(d) any of the mentioned

This question was addressed to me in an internship interview.

My question comes from Constructional Features of Rotating Electrical Machines-2 topic in portion Constructional Features of Rotating Electrical Machines of Electrical Machines

Answer 1

The correct option is (a) low speed prime movers

Easiest explanation: For accommodating large number of poles, the rotor diameter must be comparatively increased, and from mechanical considerations, salient pole construction has been found to suit best for low speed prime movers.