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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Lift.
  Traction.
  Domestic pump.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable load.
  windage friction.
  variable supply voltage.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 75 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 A modulated supply frequency AC voltage with slip frequency envelop.
 DC.
 AC of supply frequency.
  DC of slip frequency.

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Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 Induction motor.
 DC compound.
 DC shunt.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thinner.
  rotor can not have any laminations.
  sipper.
  thicker.

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MORE MCQ ON Electrical Machines

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