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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 900 rpm
 850 rpm

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
 15 HP.
  13 HP.
  10 HP.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 non-sinusoidal nature of armature mmf
 uneven air-gap length
 magnetic saturation in half of the field pole
 component of armature mmf along field axis

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 air velocity.
  color of the paint.
 temperature difference.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Cummulative compound.
 Differntical compound.
 Series.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC compound motor.
 DC Shunt motor.
 Separately excited DC motor.
 DC series motor.

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