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The diameter of the commutator should be 0.2-0.4 times the main diameter for a good design.

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The diameter of the commutator should be 0.2-0.4 times the main diameter for a good design.

(a) true

(b) false

The question was asked in an online quiz.

This interesting question is from Design of Commutator and Brushes topic in chapter Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Correct option is (b) false

To explain I would say: For a good design of the commutator, the diameter of the commutator should be in the range of 0.6-0.8 times of the main diameter. If the value goes above or below this range, we should not choose that value.

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