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ELECTRICAL MACHINES

Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  2.67 %.
 1.5 %.
 5 %.
  30 %.

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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.
  240 rpm.
 450 rpm.
  470 rpm.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

  0.24 Ω.
 0.45 Ω.
 0.78 Ω.
 0.66 Ω.

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Electrical Machines
Slip exists in

  none of above.
  induction motor.
  in both machines.
  synchronous motor.

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Electrical Machines
Example of double excited machine is

None of these
 DC Shunt Motor
 Synchronous motor.
 Both are correct.

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