Question

In a two phase cylindrical rotor synchronous machine, the self inductances Lα, Lβ for phases α,β respectively are __________

(a) constant and equal

(b) constant and unequal

(c) varying and equal

(d) varying and unequal

This question was posed to me in examination.

Query is from Elementary Synchronous Machines in section Basic Concepts in Rotating Machines of Electrical Machines

Answer 1

Right answer is (a) constant and equal

For explanation I would say: Constant and equal, as the reluctance offered to the fluxes produced by phase α and β winding doesn’t vary with rotor movement.