53: An 8-pole, 3-phase, 50 Hz induction motor is
operating at a speed of 720 rpm. The frequency of the
rotor current of the motor in Hz is
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An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is _______
30.03
33.3
3.33
None of the above
Correct Option: C
Given, P = 9, f = 50 Hz, N = 700 rpm
4 Frequency of Rotor current = s.f.
S =
Ns - N
=
750 - 700
= 0.067
Ns 750
∴ fr = (0.067) × 50 = 3.33 Hz
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