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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  15 %.
 10 %.
  20 %.

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

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

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 5%
 10%
 40%
 19%

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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?

 80W
 100W
 60W
 40W

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Draw too much current.
  Develop excessive speed and damage itself.
 Produce sparking at brushes.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 1000 rpm
 950 rpm

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