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Electrical Machines

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

  Effiency.
 Speed regulation.
 Starting torque.
 Running Torque.

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Electrical Machines
Stepper motor is used in

 computer printers
 food processing
All of these
 traction

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in reverse direction.
  It will rotates in normal operation.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 266.20 N-m.
 cant be determined.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
  proportional to rotor speed.
 zero.
 constant independent of speed.

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MORE MCQ ON Electrical Machines

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