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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 1820W
 2000W
 1450W

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 all of these.
 zero or very low voltage supply.
 over load.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 commutation
 electromechanical energy conversion
 generation of voltage

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 where greater load is connected.
 where constant speed is required.
 high voltage and low current applications.

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
 both 1 and 2
None of these
 1-phase induction motor

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high torque motor.
  high speed motor.
  single phase induction motor.
  low horse power motor.

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