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Electrical Machines

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

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

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC series motor.
 DC shunt motor.
 DC compound motor.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
  s.
 2 + s.
 1 - s.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 Increases cost.
All of these
 makes the material brittle.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
 Armature winding is in series with load.
 Armature and field both are connected.
  Armature and field both are in series with the load.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.
  3190 W, 5040 W.

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