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What is the formula for total commutator loss for DC machine?

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What is the formula for total commutator loss for DC machine?

(a) brush contact loss + brush friction loss

(b) brush contact loss – brush friction loss

(c) brush contact loss * brush friction loss

(d) brush contact loss / brush friction loss

I got this question in class test.

I need to ask this question from Design of Commutator and Brushes in chapter Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Best answer
The correct option is (a) brush contact loss + brush friction loss

The best explanation: Brush contact loss = brush contact loss = armature current * brush contact voltage

Brush friction loss = (Coefficient f friction) * Brush Pressure * Area of the brush*Commutator voltage.

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