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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
 50 ohm.
  0.1 ohm.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Peaky in nature.
 Triangular and directed towards main pole.
 Saddle shape.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 develop very low starting torque.
 not start automatically.
 start automatically without trouble.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Field resistance control.
 Armature circuit resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same frequency
 same voltage magnitude
 same phase sequence
 same prime mover speed

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on designed speed.

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