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Electrical Machines

Electrical Machines
Example of double excited machine is

 DC Shunt Motor
None of these
 Synchronous motor.
 Both are correct.

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 1
 0
 finite value

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  crawling.
  resonance.
  cogging.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 field winding
 commutator
 starters

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

None of these
 leading power factor.
 unity power factor.
 lagging power factor.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 either increase or decrease
 decrease
None of these

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MORE MCQ ON Electrical Machines

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