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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
  Synchronous motor.
 DC motor.
 Induction motor.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 1/√3
 1/3
 √3

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

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

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  AC slip ring motor.
  DC series motor.
  Synchronous motor.

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
None of these
 Aame in both alternators.
 Hydro alternators.

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  phosphor bronze.
  carbon.
  aluminium.

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