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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 200 - 250 W.
 250 - 500 W.
 10 - 20 W.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 V
 f

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Electrical Machines
Which of the following motors has negative speed regulation?

 Differential compound motors.
 Both B and C.
 Series motors.
 Shunt motors.

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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

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

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Electrical Machines
Which of the following generators are used in arc welding?

 differential compound generators
 shunt generators
 cumulative compound generators
 series generators

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce hysteresis loss.

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