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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  load.
 speed.
  speed and voltage.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.

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Electrical Machines
In DC generator, brushes are always placed along

 armature axis.
 geometrical neutral axis.
  magnetic neutral axis.
 load axis.

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Electrical Machines
Rotor resistance speed control is used in

 slip ring induction motor.
 squirrel cage induction motor.
 synchronous motor.
 dc shunt motor.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 6 KVA
 10 KVA
 4 KVA
 0 KVA

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 DC shunt.
 Induction motor.
  DC series.

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