An 8-pole, 3-phase, 50 Hz induction motor is operating at

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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 _______

1. 30.03
2. 33.3
3. 3.33
4. None of the above

Correct Option: C

Given, P = 9, f = 50 Hz, N = 700 rpm
4 Frequency of Rotor current = s.f.

S =	N_s - N	=	750 - 700	= 0.067
	N_s		750

∴ f_r = (0.067) × 50 = 3.33 Hz