How the size of electic machine vary with the sped? Between slow and fast running machines of equal ratings, which one is more economical to design?

1 Answers  

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what is the working principle of energy saver control panel. please give the complete calculation & theory.

0 Answers   Lupin,

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if dc excitation is used to produce manetic flux in rotating machines then ehy it is not used in transformers.

4 Answers  

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what are smoke detectors ?

4 Answers   Indian Military Services,

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whenewher three phase supply is given to induction motors revolving/rotating field is created & rotor rotates.When the three phase supply is given to three phase transformer then revolving,/rotating field is created or not? if not why?

1 Answers  

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what is an isolation transformer??? what is its purpose??? what happens if it is not used where it should be used?????

2 Answers  

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what is the d/f b/w iverter & converter.

5 Answers   Indeco,

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why electric shock due to dc is dangerous than that of ac

8 Answers  

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what is hormonics. how it is generated & what are the problem faced by that.

5 Answers   APC,

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explain comutator action in detail.thanks

0 Answers  

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Brushed alternator is also called dc generator ? its true or false ?explain it ?

5 Answers  

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how to calculate the Neutral transformer impedance?

0 Answers   Schneider,

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