what topics we have to concentrate for power grid et.written test.and tell what to read for english synonyms and antonyms.

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Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

3 Answers  

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What is the meaning of floating point earthing in battery backed systems ?

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what are advantage and disadvantage of zener diode?

2 Answers   Infosys,

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HELLO SIR, IAM PREPARING HPCL EXAMS. SO PLS SEND MATERIAL OF HPCL ELECTRICAL ENG..TO VIJAY_8888@YMAIL.COM

0 Answers   HPCL,

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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 Answers  

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What is the suitable transmission voltage?

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1.what is the reason for transformer and lightning arrester blast in 33kv system

0 Answers   ABB,

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A ray hit a smooth regular surface at an angle of 20 from the normal. Calculate : 1. The angle btw the incident and reflection ray. 2. The angle of deviation.

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Why USe In -48 DC Volt !

3 Answers  

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What is the Difference between Ac Drives and Dc Drives? According to application, speed, Torque, cost, Reliability, Construction, Motor etc... Thankyou !!!

0 Answers   IFFCO, IIT,

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in 33kv/11kv stepdown t/f why should we use Star point

2 Answers  

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