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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 1.92
 -0.08

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Electrical Machines
During no load test, an induction motor draws power

  for copper loss and windage friction loss.
  only for the small copper loss.
  for core loss and copper loss.
  for core loss and windage and friction loss.

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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, 4
 1, 2, 3
 2, 3, 4, 5
 2, 3 ,5

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  sR2 = X2.
  R2 = sX2.
  R2 = s2X2.

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

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

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  Same as full load.
  Low.
  High.

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