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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 ∞
 a finite negative value
 a positive finite value

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Residual magnetism of the generator.
 Field resistance.
 Armature resistance.
 None of above.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 Induction motor.
 DC Shunt Motor
 Synchronous motor.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
 none of these.
  salient.
 non uniform cylindrical.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  60 Hz.
  16.67 Hz.

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