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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 0 < S < 2
 -2 < S < 2
 -1 < S < 1

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
 where constant speed is required.
 where greater load is connected.
  high current and low voltage applications.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 reluctance of core.
 volume of copper.
 iron loss.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  shunt.
  differential compounded.
  under-compounded.
  over compounded.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
  line to ground fault.
 3 - phase fault.
 line to line fault.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 stator of a dc machine.
 rotor of an synchronous machine.
 rotor of a dc machine.

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