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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.
 3Fmax.
 Fmax.
 (1/2)Fmax.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Eight times.
 Remains same.
 Doubled.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Stepper motor.
  Synchronous motor.
  DC differential compound motor.
  Slip ring induction motor.

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 none of these.
 AC to DC.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P*ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 90o.
 less than 90o.
 Greater than 90o.

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