Question

What is the total number of design steps available for the commutators in DC machines?

(a) 4

(b) 3

(c) 2

(d) 5

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

The above asked question is from Design of Commutator and Brushes in division Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

Right choice is (a) 4

For explanation: There are basically 4 design steps available for the commutators. They include the finding of the number of commutator segments, voltage across the commutator, width of the commutator and length of the commutator.