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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 60°.
 30°.
 90°.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  Both (A) and (B).
  By varying number of poles.
  By varying supply voltage.
  By varying the supply frequency.

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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

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

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

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

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
  low current and high voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V
 f²
 V²

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MORE MCQ ON Electrical Machines

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