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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
Which of the following statements are correct ?

 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 The leakage reactance of the induction motor should be small.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 112.5 W
 75 W
 50 W

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech
 θelec = θmech

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
All of these
 to achieve a stronger magnetic field.
 to avoid over heating.

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 MMf method.
 ZPF method.
 Synchronous impedance method.

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