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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
 DC motor.
 Both A and C.
  Synchronous motor.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 100 V.
 800 V.
 200 V.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 can not be determined.
 266.20 N-m.
 133.22 N-m

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
None of these
 not change.
 slightly increase.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 V²
 f

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 starters
 commutator
 field winding

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