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The formula for length of pole is L = Total length of armature – (0.001 to 0.005).

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The formula for length of pole is L = Total length of armature – (0.001 to 0.005).

(a) true

(b) false

I had been asked this question in an online interview.

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

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Right choice is (a) true

Easy explanation: First the total length of armature is calculated. Then the value is subtracted by 10-15 mm in order to obtain the length of the pole.

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