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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
All of these
 cross magnetization

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

 20 N.
  Can't be determined.
  None of these.
  15 N.

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
 Both type rotor.
 Salient pole rotor.
None of these

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

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

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the speed of the motor.
None of these
  It starts the motor.
  it limits the starting current to a safe value.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.
 5 times the synchronous speed.

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