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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC motor
 induction motor
 AC generator
 DC generator

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1500 rpm
 1470 rpm
 zero

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Electrical Machines
DC machine is a

 convection machine.
 conduction machine.
 both are correct.
 none of above are correct.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Blowers.
 Air compressors.
 Centrifugal pumps.
  Conveyers.

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

 wet grinders
 tape recorders
 personal computers as cooling fan
 food mixers

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MORE MCQ ON Electrical Machines

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