Which UPS (inverter) is better and why ? 12 V inverter and 24 V (two 12 V batteries in series) inverter which is better ......... which has the longer backup which has the greater charging time which has the greater discharging time thank you

2 Answers  

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AC covered area by ton calculation

2 Answers  

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How to know the back up time for a 5KVA UPS which is connected to 15 nos. of computers? Is there any formula for this? pls. tell me.

1 Answers   HAL,

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What is mean by earthed & unearthed cable? Voltage grade of 1.9/3.3 kV(E), 3.3/3.3 kV(UE), 3.8/6.6 kV(E)what it indicates??

2 Answers  

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How can we decide the fualt levels of sub-stations?

2 Answers   Bhel, Enercon, Prakash Industries,

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what is difference between fuse and breaker?

6 Answers   ABB,

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why make protection 85% of winding?

1 Answers  

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How does an oscillator differ from an amplifier?

0 Answers  

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basic princple of induction and synchronous motor

1 Answers  

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Where should the lighting arrestor be placed in distribution lines?

0 Answers  

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i am going to attaned the engineer (disign)iterview at HAL please give me duid line

0 Answers   HAL,

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How to calculate the transmission losses incase of overhead transmission lines?

6 Answers   Jindal,

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