A 460 V, 25 hp, 60 Hz, four-pole, Y-connected induction motor has the following impedances per phase referred to the stator circuit: R₁ = 0.641 Ω X1 = 1.106 Ω R₂ = 0.332 Ω X2 = 0.464 Ω XM = 26.3 The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For rotor slip of 2.2 percent at the rated voltage and rated frequency, find the motor's a) Speed b) Stator current c) Power Factor d) Pmech and Pshaft e) Tmech and Tshaft f) Efficiency