Question

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 N-m 2. Three unbalanced 3-phase currents are given as follows: Ia = 10∠-30° A, Ib = 0, and Ic = 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

          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 N-m

2. Three unbalanced 3-phase currents are given as follows: 
Ia = 10∠-30° A, Ib = 0, and Ic = 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

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 01 and 09 ohmphase respective 93528

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