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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 1
 0 < S < 2
 -1 < S < 1

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
  line to ground fault.
 3 - phase to ground fault.
 3 - phase fault.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 No load.
  Full load.
 Low load.
 None of these.

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Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 copper loss
 hysteresis loss
 total iron losses

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Electrical Machines
The application that need frequent starting and stopping is

  lifts and hoists.
  jaw crushers.
  blowers.
  paper mills.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 increasing the number of turns.
 using transformer oil of better quality.
 using soft material for winding.

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