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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 16/9.
 4/3.
 9/16.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will reduce
 its speed will increase
 its efficiency will improve
 its power factor will reduce

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  1/Ia.
  Ia2.
  Ia.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

None of these
 will become lagging
 will become leading
 will remain the same

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Increases.
  Decreases.
 Oscillates around the rated speed.

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