A centre zero ammeter connected in the
rotor circuit of a 6-pole, 50 Hz induction motor makes 30 oscillations in one
minute. The rotor speed is
670 rpm
990 rpm
1010 rpm
1030 rpm
990 rpm
Given
:Number of oscillations = 30
Time
taken = 30 sec, Frequency(f) = 50 Hz
Number
of poles (n) = 6t.
The frequency of the circuit will be calculated by
Hence,
the correct option is (B).
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