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Electrical Machines

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?

 100V
 20V
 200V
 10V

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Electrical Machines
Eddy current loss will depends on

 Thickness
All of these
 Flux density
 Frequency

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 Zero Hz.
 50 Hz.
 100 Hz.
 25 Hz.

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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
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 zero.
  lagging.
 leading.

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Electrical Machines
Conservator tank is used

 for better cooling of transformer.
 to take up the expansion of oil due to temperature rise.
 to act as an oil storage.
None of these

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