How to calculate the total number cells required for a particular KVA UPS system?

1 Answers  

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why the transformer has no starter

2 Answers   NTPC,

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If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree.

5 Answers   GATE,

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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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How to select, design,size & calculate for 11 KV/33KV/66KV/132KV/220 KV/440 KV circuit breaker for HT side of transformer protection/HT distribution protection?

0 Answers   Panacea,

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What is thef ormula to calculate the rating of a capacitor for a single phase motor

2 Answers  

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why we earth only one side of a power cable. And which side is advisable to earth.

1 Answers  

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How two nos. 130 kw D.C motor get synchronise using D.C drive.

0 Answers  

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what is the working principle of soft-starter & how it diff. from VFD ?????????

5 Answers   L&T,

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Why stones are layed under Transformer

4 Answers  

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Hi i want to know that in generation station what we are generate either voltage or current

1 Answers  

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in thermal power plant the steam produced is made to cool after falling on the turbine blades. my question is why this is done while the same is needed to heat up again. "jab pani ko wapis garam hi karna hai to thanda kyu karte hai"

11 Answers   Bhel,

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