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Electrical Machines

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

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

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 120 V
 240 V
 140 V

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 decrease.
 increase.
 not change.
 None of above.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor start.
  shaded pole type.
  capacitor run.
  split phase.

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 NnL − NfL.
 (NnL − NfL)/NfL.
 (NfL − NnL)/NnL.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Auxiliary winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.

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