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Electrical Machines

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

 20 ppm.
  35 ppm.
 45 ppm.
 25 ppm.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 cummulative compound motor.
 shunt motor.
 AC synchronous motor.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Copper loss.
 Hysteresis loss.
 Eddy current loss.
 Stray loss.

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  stainless steel.
  aluminium.
  phosphor bronze.

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Electrical Machines
DC machine windings are

 either of these
None of these
 full pitched
 short pitched

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Electrical Machines
Synchronous reactance of an alternator represents

 field winding reactance
 a reactance operating at synchronous speed
All of these
 armature reactance and leakage reactance

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