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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 50%
 33.3%
 57.7%

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
None of these
 back to back test
 load test

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  shunt.
  under-compounded.
  differential compounded.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 both A and B
 roller bearings → large machines
 ball bearings → small machines

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
 Increase in reliability
 continuity supply is maintained
All of these

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 50.
 80.
 36.

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