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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 (1/2)Fmax.
 Fmax.
 3Fmax.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
 6.
  8.
  2.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 maximum flux density
 supply frequency
 both 2 and 3
 load current

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  synchronous motor torque.
  DC motor torque.
  induction generator torque.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Both 1and 2
 Speed of alternators should be same
 Frequency should be same

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
  it limits the speed of the motor.
  It starts the motor.
None of these

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