Answer / k.prakashchandra

When the ups voltage = battery voltage,Number of batteries
required = desired back up hours x load /V x AH of each battery

when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?

0 Answers  

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When lag/lead/lag-lead compensation is employed?

0 Answers  

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what is meant by LT & HT?

5 Answers   ABB,

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Since phi is the angular displacement between V & I, then why we use phi in power triangle ie. when showing active, reactive & apperent power in triangular manner & if it is ok then where is V & I in the triangle.

1 Answers  

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What is “pu” in electrical engineering?

0 Answers  

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i have install 750 kva distribution transformer at my site and want to do neutral earthing. what calculations should i follow to determine earthing conductor material and size?

0 Answers   MTDC,

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The neutral&earth voltage is 0v.But we were connected the lighting load at the time ballast was failed.why?

1 Answers  

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What is the meaning of high reputuring in HRC fuse.?

1 Answers   ABB,

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Why we use mostly circular coil in transformer? not square or rectangular type of coil.

4 Answers  

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working

1 Answers  

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What is ignitor and why it is use in Hpmv lamp ?

2 Answers  

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Difference between ac parallel circuit and ac series circuit?

0 Answers  

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