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				| 1. | A 400 V, 50 Hz, 4 pole, 1400 rpm, star connected squirrel cage induction motor has the following parameters referred to the stator Rr' = 1.0 Ω , Xs = Xr' = 1.5 Ω Neglect stator resistance and core and rotational losses of the motor. The motor is controlled from a 3-phase voltage source inverter with constant V/f control. The stator line-to-line voltage (rms) and frequency to obtain the maximum torque at starting will be | 
| A. | 20.6 V, 2.7 Hz | 
| B. | 133.3 V, 16.7 Hz | 
| C. | 266.6 V, 33.3 Hz | 
| D. | 323.3 V, 40.3 Hz | 
| Answer» C. 266.6 V, 33.3 Hz | |