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Electrical Machines

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

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

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 27°C.
 32°C.
  45°C.
 35°C.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 efficiency.
 speed regulation.
 starting torque.

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc) × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc)2 × full Load.
 (Pi / Pc)1.6 × full Load.

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  lesser than power transformer.
  equal as power transformer.
  higher than power transformer.

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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

 50.
 80.
  18.
 36.

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