railway UPMRC SCTO 2024 Mock Test Electrical Machines Three Phase Induction Motor Induction Motor Rotor Frequency
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
1
670 rpm
2
990 rpm
3
1010 rpm
4
1030 rpm