Explain What will happen when direction of field current is changed (i.e, field excitation is reversed) in the following machines? 1) Alternator 2) Synchronous Motor 3) D.C Generator ( Shunt or Seies ) 4) D.C Motor ( Shunt or Seies )

3 Answers   NTPC, Transco,

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any one please tell taht what type questions will be asked in BHEL interview, i am having interview on 24th Dec, please send this to mail pradeepsistam@yahoo.co.in

0 Answers   Bhel,

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IN bateery size of positive is biger than negative .why?

8 Answers   Power Grid,

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what happen if the secondry winding of the transformer is having less no of turns compare to the primery winding.

2 Answers  

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WHY NUTRAL GROUND SYSTEM USED IN 33KV SYSTEM

0 Answers   RasGas,

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how to find number of run cable laying[LT side] for transformer & alternator secondary side? [above condition for getting output power transformer to main panel side] give the example.

0 Answers   L&T,

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how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?

1 Answers   ONGC,

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whats the application of voltage regulation? and whats the voltage regulation's device?

0 Answers  

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why ie corona losses in tranmission line

1 Answers  

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Can transformer develop three phase power from a single phase source?

12 Answers   ONGC,

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Which fault is caused by lightening and thuderstorm a. Line to line fault b. Single line to ground fault c. Double line to ground fault

1 Answers  

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bus bar design conditions and sizing pls tell me quickly

0 Answers  

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