SSC JE Electrical Engineering 2015 Paper

Question : 194 of 199

Marks: +1, -0

An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of revolving magnetic field. The frequency of rotor current is

120 Hz
180 Hz
60 Hz
200 Hz

Validate

Solution:

n_s ={120×60}/8

n_s = 900

s = {900 +1800} / 900 =3

\f = 60 ×3 = 180 Hz.

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