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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
  0.5 ohm.
 100 ohm.
  0.1 ohm.

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 90°.
 120°.
 30°.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce starting torque.
 Increase speed
 Increase acceleration duration.
 Reduce armature heating.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 three.
 two.
 four.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%

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

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

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MORE MCQ ON Electrical Machines

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