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Electrical Machines

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

 90°
 70° to 85°
 0°
 25° to 30°

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
  any of the above.
 over commutation.
  too rapid reversal of current.

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Electrical Machines
Lamination of transformer core is made of

 cast steel.
 wrought iron.
  cast iron.
  silicon steel.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
 continuity supply is maintained
All of these
 Increase efficiency under light load conditions

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / E2

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 remains same.
 Decrease.d
 increase.

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