Question

Why are the slip rings made use of?

(a) they are used to provide excitation to field windings

(b) they are used to provide excitation to the armature windings

(c) they are used to reduce the heating effects

(d) they are used to reduce the losses

I had been asked this question in an internship interview.

My doubt is from Construction of Hydro-Generators in section Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right option is (a) they are used to provide excitation to field windings

Easiest explanation: The slip rings are the last construction material made use of in the hydro-generators construction. They are used to provide excitation to the field windings.