for what voltage will reactive power be largest in 380 kv line : a) 375kv b)380kv c)385kv

0 Answers  

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in case dc we mark as + ve & -ve..but in case a.c. we mark as ph&N...Y LIKE PLZ TELL ME

4 Answers   NPTC, TCS,

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I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. Between alternator & breaker one stepup transformer used. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

0 Answers   Jindal,

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What is Exitation voltage and Exitation current? What is the function of these in Alternator?

2 Answers   TC, Tisco,

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How the neutral earthing is connected in DG alternator

6 Answers  

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how many kw = one ton air condition?

2 Answers  

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What are the differents between Breaker & Contactor?

8 Answers  

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why in isolation transformer we dont get any shok?

2 Answers  

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Why transformer neutral earthing? What is advantages?

3 Answers  

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how step up transformer step up the voltage and what is the reason behind it?

3 Answers  

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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HAI SENT HPCL APTITUDE QUESTION PAPER, MY EMAIL ID IS angus_eee04@rediffmail.com,angus_eee04@yahoo.com

0 Answers  

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