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Electrical Machines

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 any of the above
 0.5
 1

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 none of these.
 has no relation.
 inversely.

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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

 800 V.
 200 V.
 100 V.
 400 V.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.05+j5.08 ohms
 8+j13 ohms
 53+j85 ohms
 3.5+j5.8 ohms

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
 225 V.
 230 V.
  222 V.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

  salient.
 none of these.
 cylindrical.
 non uniform cylindrical.

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