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Electrical Machines

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

 1 - s.
  2 - s.
  s.
 2 + s.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3%
 -3%
 +3.33%

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
  Stepper motor.
 Hysteresis motor.
 Reluctance motor.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
All of these
 minimum

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Both wave and lap winding.
 No wave and lap winding.
 Wave winding.
 Lap winding.

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Electrical Machines
Dynamic braking can be used for

All of these
 compound motors.
 shunt motors.
 series motors.

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