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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage and load
 supply voltage

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid over heating.
All of these
 to achieve a stronger magnetic field.
 to avoid locking of the armature.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will becomes four times.
 It will remain the same.
  It will be halved.
  It will be doubled.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on overload.
  there is no load on the generator.
  the generator runs on designed speed.
  the generator runs on full load.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable supply voltage.
  variable frequency.
  variable load.
  windage friction.

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MORE MCQ ON Electrical Machines

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