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Electrical Machines

Electrical Machines
From no load to full load the slip will

 not change.
 slightly decrease.
None of these
 slightly increase.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 wet grinders
 personal computers as cooling fan
 tape recorders

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φ/f
 E ∝ f/φ
 E ∝ 1/(φf)
 E ∝ φf

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum power.
 maximum voltage.
 no voltage.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase induction motor.
  None of these.
  Poly-phase synchronous machine.
  Single phase induction motor.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 repulsion motor.
 AC series motor.
 reluctance motor.

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