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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

  Commutator.
 Armature.
 Brush.
 Yoke.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  0.54.
  1.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
  starting resistance in the starter.
None of these
  rotor at slip rings.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
 Torque decrease and speed increases.
  Torque increase and speed decrease.
 Both torque and speed decrease.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
 5 %.
 1.5 %.
  2.67 %.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  980 Watt.
 1800 Watt.
  1960 Watt.
 1920 Watt.

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