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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Star - delta
 Delta - star
 Star - star

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

  223.V.
 300 V.
 150 V.
 200 V.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 tape recorders
 wet grinders
 personal computers as cooling fan

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
  Run at dangerously high speed.
 Not develop starting torque.
 Draw more current without producing sufficient torque.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
 differentially compounded.
  shunt connected.
  cumulatively compounded.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  more copper loss.
 less magnetic core loss.
  no magnetic core loss.

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