Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
  470 rpm.
 450 rpm.
  240 rpm.

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  power factor at starting in the same as that while running.
  power factor at starting is low as compared to that while running.
  none of them.

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