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What is the formula of the output equation of ac machines?

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What is the formula of the output equation of ac machines?

(a) kVA input Q = output coefficient * diameter^2 * length * synchronous speed

(b) kVA input Q = output coefficient / diameter^2 * length * synchronous speed

(c) kVA input Q = output coefficient * diameter^2 / length * synchronous speed

(d) kVA input Q = output coefficient * diameter^2 * length / synchronous speed

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Right option is (a) kVA input Q = output coefficient * diameter^2 * length * synchronous speed

Best explanation: The output coefficient, diameter, length and synchronous speed are first calculated. Then on substitution gives the kVA input and in turn gives the output equation.

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