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Electrical Machines

Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 same.
 different.
 changes.
 none of above.

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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

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

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to earth.
  to a DC source.
 in reverse.
 to an AC source.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power factor.
  Improve voltage level.
  Improve current level.
  Improve power level.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 57.1%.
 59.2%.
 88.8%.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1440.
 1450.
 1500.
  1435.

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