1. A 4-pole, 3 phase induction motor has a wye-connected stator winding and runs on a 220 v, 60 Hz supply. The rotor resistance and standstill leakage reactance are 0.1 and 0.9 ohm/phase, respectively. The ratio of rotor to stator turns/phase is 2/3. Calculate the torque developed in N-m when running with a slip of 4%.
Answer. 40.4
2. Three unbalanced 3-phase currents are given as follows:
Ia= 10∠-30° A, lb = 0 and lc = 10∠-150° A. Find Ict.
Answer. 3.34∠150° A
3. Two wattmeters both have readings of 5 kW when connected for the two-wattmeter method in a 480-v three-phase circuit that has a balanced Δ load. Find the Δ phase impedance
Answer. 69.1∠0° Ω
please help me answer these, please provide solution
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