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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 72
 36
 74

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Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  20 %.
  2.5 %.
  15 %.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 improve and the speed rises.
 deteriorate and the speed rises.
 deteriorate and the speed falls.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.
  three phase winding.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 increase.
 decrease.
 remains constant.

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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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