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What should be the maximum permissible level for frequency in normal operating conditions?

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What should be the maximum permissible level for frequency in normal operating conditions?

(a) < 2 Hz

(b) > 3 Hz

(c) < 4 Hz

(d) > 3 Hz

The question was asked in quiz.

Question is taken from Losses and Efficiency in division Three Phase Induction Motor of Design of Electrical Machines

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Right answer is (b) > 3 Hz

The explanation: The normal condition operation depends upon the frequency levels in the machine. It should not exceed 3 Hz.

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