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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
  lagging.
 zero.
 unity.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 armature.
 none of these.

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced axial length of the machine.
  results in reduced leakage reactance.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC shunt motor with field weaking control.
 DC shunt motor with armature resistance.
 DC compound motor.

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Cage induction motor.
  Shaded pole IM.
  Synchronous motors.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 remain the same.
 be unpredictable.
 increase
 decrease.

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