The following test data were taken on a 5.5 kw, four-pole, 220-v, 50-hz, y-connected im having a rated current of 28 a. dc test: vdc = 13.6 v idc = 28.0 a no-load test: vl = 208 v f = 50 hz i = 8.17 a pin = 420 w locked-rotor test: vl = 25 v f = 15 hz i = 27.9 a pin = 920 w (a) determine the per-phase equivalent circuit of this motor. 4 marks (b) if the motor runs at 1425 rpm, calculate the input current drawn using the equivalent circuit parameters. 4 marks (c) solve the equivalent circuit and plot power input, input current, power output, toque, power factor as a function of speed (slip). draw the torque versus speed characteristics of the motor.