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A properly shunted center zero galvanometer is connected in the rotor circuit of a 6-pole, 50 hz wound rotor induction motor. If the makes 90 complete oscillations in one minute, the rotor speed is?(a) 1000 rpm(b) 970 rpm(c) 950 rpm(d) 930 rpmI got this question during an interview.My query is from Rotor Frequency in division Induction Machines of Electrical Machines

Answer»

Correct ANSWER is (b) 970 RPM

The BEST I can EXPLAIN: Rotor frequency= s*f1 = 90/60 = 1.5 Hz.

s = 1.5/50 = 0.03

rotor SPEED = 1000(1-0.03) = 970 rpm.



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