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What is the relation of the wire cross-section with respect to the armature resistance?

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What is the relation of the wire cross-section with respect to the armature resistance?

(a) wire section is directly proportional to the armature resistance

(b) wire section is indirectly proportional to the armature resistance

(c) wire section is directly proportional to the square of the armature resistance

(d) wire section is indirectly proportional to the square of the armature resistance

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The above asked question is from Design Steps and Considerations in chapter Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Correct option is (a) wire section is directly proportional to the armature resistance

For explanation: The 10th design step of the PMDC motor is the calculation of the wire cross section. The wire cross section is directly proportional to the armature resistance.

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