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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 same.
 more.
 between 50% and 90%.

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Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
 8 pole.
  2 pole.
 6 pole.

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Electrical Machines
Stepper motor is used in

All of these
 traction
 computer printers
 food processing

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same voltage magnitude
 same frequency
 same phase sequence

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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?

 38%
 60%
 40%
 68%

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
 50 ohm.
  0.1 ohm.

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