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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 60°
 10°
 30°

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
  45°C.
 32°C.
 27°C.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Increases.
  Decreases.
 Oscillates around the rated speed.

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

 minimum
All of these
 zero
 maximum

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  hold armature stamping in position.
  protect the whole machine.
  provide return path for the flux.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  synchronous motor torque.
  induction generator torque.
  induction motor torque.

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MORE MCQ ON Electrical Machines

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