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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  open circuit.
  increase in speed.
  decrease in speed.
  short circuit.

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

 speed.
  speed and voltage.
  load.
  voltage.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 leading.
 unity.
 zero.

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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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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S
 PZL/4Sa²

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 synchronous speed.
 any of the above.
 slip speed.

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