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Do I need a special Transformer to put 240 VAC 3 phase into it and and get 480 VAC 3 phase out of it to run a machine? Or, do I just use an ordinary step down transformer and step up the voltage? Thanks
2 5386We know that, in case if there is a faulty insulation,or sc, the current is bypassed to earth through the earth wire that has low resistance.Actually, what will happen to that current that flows through gnd?In that case,if we come in contact with that faulty appliance, wont that current flow through us as we form a closed path by standing in gnd?Is grounding a safety measure?
3 6442Hai, I am from EEE branch.On feb 17 iam going to write an Exam for hindustan petrolium corporation Ltd.So plz send me the written exam pattern/Q's/interview questions.please mail to yuva_polisetti@yahoo.co.in
1811why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer.
12 74461sir, I am from EEE branch.On feb 17 iam going to write an Exam for hindustan petrolium corporation Ltd.So plz send me the written exam pattern/Q's/interview questions.please mail to eee_dharmendra@yahoo.com
1837how can you prove that in CE configuration a transistor has 180 degree phase shifted output
Bhel,
5 15424hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com
1785HAI SENT HPCL APTITUDE QUESTION PAPER, MY EMAIL ID IS angus_eee04@rediffmail.com,angus_eee04@yahoo.com
2260How can we measure and monitor critical performance parameters of Diesel Generator Sets, both electrical and engine ?
3 10490hi frnds.....anyone get any reply from HPCL. I HAVN'T.....B,COS written will b on FEB 17 th.
HPCL,
1 4685WHAT IS THE DIFFERENCE BETWEEN RESISANTANCE AND IMPEDANCE IF IMPEDANCE IS MORE THAN RESISTANCE AT SAME VOLTAGE CAN WE HAVE RELATION DERIEVED BETWEEN THEM
4 10619Post New Electrical Engineering Questions
what is magnetizing current test in power transformer
what is photo voltic cell,& what are the materials associated with that?and any spcifications like volts/cm etc?
what are the Alarm, Trip & Safety equipment (Issues) present in Power Transformers pls Mail it to ashokbabunhce@gmail.com
Give some differences between open loop and closed loop control systems.
In what cases (circumstances)we should apply P controller, PD controller, PI controller & PID controller ?
what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?
state the disadvantages of carbon filament???
when ac current flows thru d coil of a contactr,it energizes,magnetic field attracts d contact of the coil...nw wont dt ac current in d contct induce current back on to d coil thru mutual inductance leading to high currnt in d coil
What the difference between ac and dc inductor an capacitor
please give some hindalco placement papers for written exam
If only R Phase is connected in 2 pole elcb, n is not connected than it will work or not in ground fault.
According to conduit size which size wiring & how many wires can we provide wires in conduit & how can we select conduit size accordingly?
What is MS-EXCELL?
why dc is used in control circuit for mv & hv switchgear instead of ac
why do motors burn out? I understand why adding parallel loads to a power source means more current moves through the circuit, and can destroy circuit elements by overheating. What about when you have a vaccuum cleaner intake flush against a floor, a room fan sitting directly against a wall, or a power drill trying to drill through something too hard?
