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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 (NnL − NfL)/NfL.
 NnL − NfL.
 (NfL − NnL)/NnL.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 none of above.
 slip rings.
 commutator.
 solid connection.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
 Armature winding is in series with load.
 Armature and field both are parallel.
  Armature and field both are in series with the load.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 None of above.
 decrease.
 increase.
 not change.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 Greater than 90o.
 less than 90o.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Ward Leonard control.
  Any of above method.
  None of above.
  Rheostatic control.

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