Use the information below to answer questions 1 to 3:
A 415-V, 3-phase, 50-Hz, star-connected induction motor has the following parameters in ohms per
phase: $R_1 = 0.04$, $X_1 = 0.15$, $R_2' = 0.05$, $X_2' = 0.15$. Ignore the magnetizing branch.
1. Calculate the starting current in amps.
2. Calculate the starting torque in newton-meters, if the synchronous speed is 104.72 rad/s
3. Calculate the value of the resistance that should be added to the rotor circuit to increase the
starting torque to maximum