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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Motor frame.
 Field.
 Coupling mounted on the shaft.

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

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Lap winding.
 Both wave and lap winding.
 Wave winding.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 20 volts.
 10 volts.
 40 volts.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of induced emf.
 direction of flux.
 direction of motion of the conductor.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
  Increases.
 None of above.
 Remains unchanged.

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MORE MCQ ON Electrical Machines

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