hi frnds...pls send me aptransco previous papers .....pls..pls,,,(madhar.rocking@gmail.com)and suggest me some websites

0 Answers  

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why the rating of a transformer in kva not in kw.

9 Answers  

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Name the earthings?

3 Answers   HSL,

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Single line diagram for dbb (double bus bar)system.

0 Answers   KSEB, L&T, Siemens,

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Why DC weldings sets preffered over AC considering human safety aspects ?

2 Answers  

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how to select a cap,when a fan is required 2.5 micro ferad cap,then how we know about 1 hp motor?

1 Answers  

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why do harmonics generata?

1 Answers  

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase, before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

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What happens if you give supply to the rotor of three phase induction motor?

11 Answers  

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Why do we use center tap transformer that used with portable tools

0 Answers  

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where we use zero sequence current transformer or core balancing ct.

2 Answers  

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why knee point voltage should be high in Ct for differential protection

1 Answers   NTPC,

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