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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 rectangular
 flat-topped
 sinusoidal

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Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
 Centrifugal pumps
  All of this.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 copper loss.
 vibrations.
 eddy electric current loss.

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Electrical Machines
To avoid formation of grooves in the commutator

 the brushes of same polarity should track each other.
  the brushes of opposite polarity should track each other.
  brush position has no effect on the commutator grooving.
None of these

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 800 V.
 100 V.
 200 V.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 4
 2
 6

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MORE MCQ ON Electrical Machines

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