एक 3-फेज इंडक्शन मोटर में 2 पोल हैं और यह 400 V, 50 Hz आपूर्ति से जुड़ा है। जब स्लिप 3% हो तो वास्तविक रोटर गति (actual rotor speed) ज्ञात कीजिए।

The power input to a 4-pole, 3-phase, 50 Hz induction motor is 50 kW, and the slip is 5%. The stator losses are 1.2 kW. Determine the rotor copper losses.

The rotor of an 8-pole, 50 Hz, 3-phase induction motor has a rotor resistance of 0.4 Ω/phase and runs at 720 rpm. For a constant load torque, calculate the additional rotor resistance per phase that must be inserted to reduce the speed by 25%.