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Calculate the shaft power developed by a motor using the given data: Eb = 50V and I = 60 A. Assume frictional losses are 400 W and windage losses are 600 W.(a) 4000 W(b) 2000 W(c) 1000 W(d) 1500 WThis question was posed to me in an international level competition.Question is from Dynamics in section Dynamics of Electrical Drives of Electric Drives

Answer»

Right answer is (b) 2000 W

Explanation: Shaft power developed by the MOTOR can be CALCULATED using the formula P = Eb*I-(rotational LOSSES) = 50*60 = 3000 – (600+400) = 2000 W. If rotational losses are NEGLECTED, the power developed becomes equal to the shaft power of the motor.



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