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What is the formula of the area of each ring short-circuiting the bars?(a) area of each ring short-circuiting the bars = (0.7-0.9) * area of damper bar(b) area of each ring short-circuiting the bars = (0.8-1) * area of damper bar(c) area of each ring short-circuiting the bars = (0.7-1) * area of damper bar(d) area of each ring short-circuiting the bars = (0.8-0.9) * area of damper barI got this question in exam.My query is from Design of Rotor topic in division Design of Synchronous Machines of Design of Electrical Machines

Answer»

The correct answer is (b) AREA of each RING short-circuiting the bars = (0.8-1) * area of damper bar

Explanation: FIRST the area of damper bars is calculated first. NEXT the area of damper bars is multiplied by a value between 0.8-1 to obtain the area of each ring short-circuiting the bars.



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