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Electrical Machines

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

 40W
 100W
 60W
 80W

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 399 V.
  230.2 V.
 50 V.
 100 V.

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

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

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  increases armature speed.
  reduces inter poles flux density.
  reduces generator emf.
  results in sparking trouble.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Any where between 75 % and 90 %.
 Less than 50 %
 Around 90 %

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Electrical Machines
The slip of an induction motor normally does not depend on

  synchronous speed.
  rotor speed.
  shaft torque.
  core loss component.

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