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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

None of these
  DOL.
  star delta.
  both A and B.

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Electrical Machines
Hunting in a synchronous cannot be due to

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

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Electrical Machines
In a DC compound motor the field regulator is provided to

 limit the armature current.
 control the armature flux.
 demagnetize the field partially.
 control the field flux.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
 20 V.
  40 V.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 120 V
 140 V
 175 V

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 remain nearly constant
 increase to rated voltage and then may decrease
 decrease

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MORE MCQ ON Electrical Machines

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