Answer Posted / kunal

uninterrupt power supply is mainly use for short time .
means according to ups VA it gives backup.
ups is also two types : on line and offline . online ups
having high volt and amp for long time backup with with
high dc voltage.but ups start with 12v dc with 7 amp.
but inverter is startwith 12v,24,dc to 36v dc and 120amp to
180amp battery with long time backup.

I want to ask that is there any relation between current denesity of copper and material purity. also is ther any standard which defines the standard current denesity of material.

1975

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which types of relay used in acb and vcb?

2747

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Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close?

1219

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How many devices can be connected in one zone of FACP

2327

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Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?

2310

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what is saturation kit?which use above 15 kw motors panel side.

4215

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Why an ac systems are preferred over dc systems?

1117

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what is the difference between fault current ant short circuit current?

2714

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how to compute kAIC?  with formulas...

4246

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design a 3 bit synchronous and asynchronous counter using T- flipflop

2014

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how does the thyistor work in dc drive?

1999

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Define cut-off rate?

1093

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How to do fabrication , busbar and wiring cost for : 1. LT Panels 2. C& R Panel

1929

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what is meant by impulse voltage?

2017

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what is different between relay and plc?

5717

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