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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly increase.
 slightly decrease.
None of these
 not change.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 250 A.
 340 A.
 570 A.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Draw too much current.
  Develop excessive speed and damage itself.
 Open fuse or circuit breaker.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 lagging power factor.
 unity power factor.
 leading power factor.
 any of the above.

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Electrical Machines
In case of IM the torque is

  inversely proportional to √slip.
  directly proportional to slip.
  directly proportional to slip2.
  inversely proportional to slip.

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MORE MCQ ON Electrical Machines

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