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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

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

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Electrical Machines
DC generator will not build up voltage

 any one of above.
 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
  if it has lost residual magnetism.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 0°
 70° to 85°
 90°

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.
None of these

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave
 half wave
 half wave controlled
 full wave controlled

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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