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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 400 V.
 480 V.
 350 V.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 shaded, unshaded
 unshaded, unshaded
 shaded, shaded

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
  0.1 ohm.
 50 ohm.

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Electrical Machines
Which of the following bearings and their uses are correct

 both A and B
 roller bearings → large machines
 neither 1 nor 2
 ball bearings → small machines

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

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

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under north pole.
 lie in the inter polar gaps.
 lie under south pole.
 there is no hard and fast rule for this.

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