Question

Why is armature of a dc machine made of silicon steel stampings?

(a) To reduce hysteresis loss

(b) To reduce eddy current loss

(c) For the ease with which slots can be created

(d) To achieve high permeability

The question was asked in examination.

Question is from Operating Characteristics of DC Generators topic in section DC Generators of Electrical Machines

Answer 1

The correct choice is (a) To reduce hysteresis loss

The explanation is: The silicon steel has very high permeability and makes the flux past consistent. Thereby making lesser losses.