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What is the formula for output equations in synchronous machines?

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What is the formula for output equations in synchronous machines?

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

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

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

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

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Asked question is from Synchronous Machines Output Equation in portion Design of Synchronous Machines of Design of Electrical Machines

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

Explanation: The output equation is found out by first calculating the output coefficient. Next, the diameter and length are obtained, and the synchronous speed is calculated using the tacho-generator to obtain the kVA output.

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