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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum power.
 maximum current.
 no voltage.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 reluctance of core.
 iron loss.
 volume of iron.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

  Decrease in weight/KVA.
 Reduced iron loss.
 Reduced copper loss.
 Increase in weight/KVA.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 400 V.
 350 V.
 420 V.

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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?

 100V
 20V
 200V
 10V

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 50 Hz
 25 Hz
 0 Hz

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