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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 cast iron.
  carbon.
 mica.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  1500 rpm.
  3600 rpm.
  4000 rpm.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 100V
 200V
 10V

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.
 rotor of a dc machine.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2HZ
 1 Hz
 2.5Hz

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 no load
 any of the above
 full load

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