Answer / sunil singh

if we are not using oil in transformer than generally it's
size must be increased as possible as we can,, in this way
it's size increases so many times to provide insulation as
well as cooling......

Answer / dharmarajsinh

cooling of transformers are based on rating of
transformer.however if oil is not to be used for same
rating than insulation lavel will be increes and than for
cooling force cooling to be provided and altimatly size of
transformer will increases.

I am an electrical engg and has got selected in wipro should i go there now or try in some core company ?

3 Answers   Wipro,

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is it necessarry to charge the battery of ups always??

3 Answers  

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why in an electrical lab a bulb connected to supply goes off slowly when the main supply is switched off?

2 Answers  

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As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.

0 Answers  

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plz explain TSM and PSM.with example suppose ct ratio is 4000/5 and tsm is .15 and plug is at 3.75 if fault current is 8000A.so how i find relay oprating time.

2 Answers   College School Exams Tests, ME,

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What is PIR (pre inserting resistance) in 400kv EHV SF6 BREAKER? Why it use?

1 Answers   Adani,

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If a three phased motor or not working phased change on poles so how to find which one red yallow & blue

1 Answers  

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Can we use droop CT in neutral in place of W phase of alternator ?

2 Answers  

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Transmission voltage is kept 11KV,33KV,66KV,132KV,220KV due to form factor. What happen to 400KV and 765KV transmission voltage?

0 Answers  

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We say that if voltage in a power system is increased,for a constant power the current will decrease (by P=VI). isn't this in disagreement with the ohms law(I propotional V;resistant const.).Since the resistance of transmission lines remains constant,shouldn't inc in voltage cause inc in current across the transmission line? I have read many articles across the net but still couldn't this figure this out. :( Guyz plz assist me with dis..:)..

4 Answers  

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what is the method to calculate the voltage drop for number of meters Example 250volts I/p at one end if the cable length is 50 meters what could be the drop?, after 100 meters how much? needs formulae.

1 Answers  

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i have a wire.and the current flowing in that.when we cut the wire then why dont we seen the elactrons....

8 Answers   GM General Motors,

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