December 2010|Online electrical engineering & Electrical Interview Questions

Saturday, December 11, 2010

ELECTRICAL ENGINEERING QUESTIONS AND ANSWERS

Here are some Electrical Engineering questions which i came across in internet.I will give the answers for the questions.Hope it would be useful for all Electrical Engineers.Visitors please give your feedback so that i can improve in helping other Electrical Engineers.

Sunday, December 5, 2010

ONLINE ELECTRICAL ENGINEERING TEST 1

    These questions were asked in the competitive exams.The test is for 10 minutes and you can submit the test if you have finished it early.Hope it would useful for all Electrical Engineers.More Tests would be conducted online related to the electrical subjects.Keep watching Online Electrical Engineering for more ....

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CLICK HERE TO START THE TEST

Wednesday, December 1, 2010

TRANFORMER OIL IMPORTANCE AND USES

Here i am answering another question asked by Amit.
What is the importance of Transformer Oil ?
Transformer Oil is a highly refined mineral oil that has excellent insulating properties and is very stable at high temperatures.It also serves as a coolant.

In a Transformer, the primary winding and secondary windings are placed inside a casing.To provide electrical insulation between the live parts inside the transformer casing we use Transformer Oil.Tranformer Oil should also withstand high temperatures for a long period.The cooling of transformer can be increased by providing cooling tubes and external fans outside the transformer casing.  

Buchholz Relay is a protective device used in transfomers.Also various testing is also done on the transformer to test the oil quality.Another important thing is we must have seen some tranformers bursting near our place.This occurs due to insulation failure inside the transfromer.Reason behind this might be the Transformer Oil used would have become old and lot of sludge would have formed which causes insulation failure.