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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
  magnetic field poles.
 none of these.
 armature.

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Electrical Machines
Which of the DC Motor use flywheel?

 Series motor.
 Cumulatively compound motor.
 Shunt motor.
 Differently compared motor.

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Electrical Machines
Series generators are used in which of the following applications?

All of these
 Air crafts.
 Arc welding.
 Used as boosters in dc distribution or transmission.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Friction and windage losses
 Hysteresis losses
 Eddy current losses

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Electrical Machines
Skewing of cage rotors offers the following advantages

  locking tendency is reduced.
  all of below.
  uniform torque.
  less noise.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  720 to 920.
  375 to 500.
  500 to 720.
  1440 to 2880.

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