A four-pole squirrel-cage motor has the following characteristics:
• Power input at a rated load is 4200 W with a power factor of 0.60.
• Rated speed is 1150 rpm.
• Resistance of each stator windings (there are three) is Rs = 0.16 Ω.

The motor is supplied by a three-phase source with line-to-line voltage 460 V and a frequency of 500 Hz. The windings of the motor have a Y-connection. Determine

(a) The slip factor of the motor in percent

(b) The line current drawn by the motor

(c) The resistance losses in the stator

(d) The efficiency losses of the motor if the core losses at the stator are 475 W (neglect the friction losses and other losses, including the resistance and core losses at the rotor)

(e) The torque delivered by the motor in N · m