Answer / gangadhar shailaja bellary

Your question is not perfect.Any way UPS not suply the the
DC voltage is suply a/c only with out interupt.We use DC in
control circuit because it has free from hormonics and it
has constant.

Answer / rajesh vania

Gangadhar say
absolutly right

Answer / nitin bhoraokar

Gangadhar predicted rightly.

Answer / dinesh kumar sharma

dc voltage is necessary for l.t pannels was because dc is
free from harmonics as well as smooth, in dc voltage no
variations are there so controlling becomes easier.
no we can not use ups takes ac to charge battery store in
dc and than when ever supply cut off than battery going to
discharge voltage is converted into dc to ac one of the
example in case of computer
and also ups can be used for smaller duration so why we
use UPS

Answer / mashani

UPS is not DC it's AC....this equipment usually to support
Control system such as Computer Sentral Control....this
equipment is supplied by battery which the battery is DC
source.....and convert by inverter inside UPS to AC source
to supply the emergency equipment...
emergency equipmen is equipment where may not interrupt
even the main source is blackout....
if you mean DC source this could be battery
charger....battery charger ussualy used to operating
controoler....such as PLC, also some electrical equipment
is needed DC source...such as Circuit breaker, ACB(Air
Circuit Breaker) motor inside the breaker is using DC source

Why we can't start a tube light without a starter(choke) and an inductor?

1 Answers  

How do you select a cable size(Cu&Al) for a particular load

10 Answers   Adhunik, BPCL Bharat Petroleum, Hiecon, TATA,

If the damper winding on the rotor of a synchronous motor is removed after starting what will happen?

7 Answers   IOCL,

What will happen if the generator turns in a wrong direction?

2 Answers  

why neutral and body earthing of transformers kept separated? what is distance between two is required as per is?

6 Answers  

whycircuit breaker is not connected at the generator end where the capacity of the generator is more say 60MW, 100MW etc.

2 Answers   Adani, Adani Power,

How we can calc. the Backup time of a battery Bank???

6 Answers   Emerson,

Why size of HT cable is less then LT cable inspite of the fact that voltage is higher in HT cable?

2 Answers   L&T,

What are the types of bus duct?

1 Answers  

what is the eight bit unit?

0 Answers  

What are IR values and what it should be for coil and for insulator

0 Answers   GPSC Gujarat Public Service Commission,

what is pressure relief valve in D.G ?state its function?

3 Answers