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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V + Ia.
 E = V – IaRa.
 E = V + Ra.
  E = V + IaRa.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Differential compound motors.
 Series motors.
 Shunt motors.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 50 ohm.
 100 ohm.
  0.1 ohm.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying the supply frequency.
  By varying supply voltage.
  By varying number of poles.
  Both (A) and (B).

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 0 Hz
 50 Hz

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MORE MCQ ON Electrical Machines

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