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The frame of a synchronous motor is made of _________

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The frame of a synchronous motor is made of _________

(a) Aluminum

(b) Silicon steel

(c) Cast iron

(d) Stainless steel

This question was posed to me in semester exam.

My question is taken from Effect of Starting on Power Supply, Motor and Load topic in portion Starting of Electric Drives

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The correct option is (c) Cast iron

Easiest explanation: The frame of a synchronous motor is made of cast iron. The power factor of a synchronous motor depends upon maximum power transfer capability.

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