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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.2
 0.02
 0.4

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 high current and high voltage
 low current and high voltage
 low current and low voltage

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 maximum
 any of the above
 zero

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced copper loss.
  Decrease in weight/KVA.
 Reduced iron loss.
 Increase in weight/KVA.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 60%
 40%
 38%
 68%

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Electrical Machines
In an auto-transformer, power is transferred through

 conduction process only.
 induction process only.
 both A and B.
None of these

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