Question

What is the range of the air gap density for salient pole machines?

(a) 0.52-0.65 Wb per m^2

(b) 0.5-0.6 Wb per m^2

(c) 0.54-0.65 Wb per m^2

(d) 0.44-0.65 Wb per m^2

This question was posed to me in a national level competition.

This intriguing question originated from Synchronous Machines Output Equation in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right choice is (a) 0.52-0.65 Wb per m^2

Easiest explanation: The range of air gap density for salient pole machines is 0.52-0.65 Wb per m^2. The range of air gap density for turbo-alternators is 0.54-0.65 Wb per m^2.