engineering recuitment UPMRC JE 2024 Mock Test Electrical Machines Three Phase Induction Motor Induction Motor Rotor Frequency
The stator of a 415V, 50 Hz, 4-pole slip ring Induction Motor is excited by rated frequency with slip rings open circuited. The rotor is made to rotate at a speed of 600 rpm in the opposite direction to the normal direction, The frequency of induced voltage across slip ring is
1
30 Hz
2
70 Hz
3
20 Hz
4
35 Hz