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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 between 50% and 90%.
 same.
 less than 50%.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 100Ω
 200Ω
 10Ω
 50Ω

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  none of above.
  cross-magnetization as well as demagnetization.
 demagnetisation.
  cross-magnetisation.

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Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EIa.
  EbIa.

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 4%
 2%
 5%

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Electrical Machines
Which of the following machine will have maximum efficiency?

 DC motor.
  Electrical power transformer.
 Induction motor.
 Electrical power generator.

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