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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 sinusoidal
 co- sinusoidal
 flat-topped

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

 90°.
 120°.
 30°.
 60°.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 low at rated load only
 both A and B
 low at light loads only

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3 ,5
 1, 2, 3
 2, 3, 4, 5
 2, 3, 4

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  equalizing coils.
  external star-connected resistors.
  DC supply.
  3 - Φ AC supply.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 control the armature flux.
 demagnetize the field partially.
 limit the armature current.

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