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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 5%
 2%
 25%
 4%

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Electrical Machines
A short circuit test on a transformer gives

  copper loss at any load.
 copper loss at over load.
 copper loss at full load.
 copper loss at half load.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
  460 A.
  340 A.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 series with armature
 parallel with main poles
 series with main poles

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.
 Both A and B.

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

 decrease.
 None of above.
 increase.
 not change.

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