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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 0KVA
 16KVA
 20KVA

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
None of these
 Demagnetization
 Cross magnetization

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 differential compound.
 cumulative compound.
 shunt.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will become slow.
 armature will oscillate about original speed as the mean speed
 motor will attain dangerously high speed
 armature current will drop

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
  1.
 0.6.
 0.8.

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