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Electrical Machines

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

 45 ppm.
 20 ppm.
  35 ppm.
 25 ppm.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  run in a direction opposite to previous one.
  not run.
  continue running in the same direction as before.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 magnetizing.
  demagnetizing.
 ineffective.
 cross – magnetizing.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 pole chamfering
 pole stacking
 compensating winding

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Nr
 Zero
 Ns

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv2.
 Bl2v2.
 Blv.

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