Answer / ram

ya i thing is correct

Answer / taylor

thanx guys b cas of ya ans i m able 2 complete my projeck
so thanx!!!!!!!!!!1

Answer / rohit singla

UPS is an electronic device which functions as alternative
power source which supply power continuosly to the senstive
electronic devices under circumstances

Answer / chandrahasan

The main building blocks of any given UPS (on-line, off-line
or stand-by) are the charger, inverter, static switch or
static disconnect and battery. The charger converts AC to DC
power which float charge is the battery and feeds
the inverter. The inverter converts DC to AC power, and the
static switch or static disconnect is a solid-state device
used to apply or disconnect AC power. The battery stores DC
power that is used as a back-up power source when
the utility power is not available.

Answer / rk mehta

dear sir,
I have a 2.5kva uniline ups,which works on 148 dc
source, but at present i donot have dc power source, now on
connecting it on ac source it gives indication of presence
of line but on pressing start button nothing happens. is it
possible to switched on the same ups without connecting the
dc source.

how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.

0 Answers   OPS,

All we know about T/R, Is it possible to make T/R primery singlr phase and secondery three phase,If it then how?... Need Description

1 Answers  

difference between relay and solenoid?

2 Answers  

what is the functioning of cvt in a substation?

2 Answers  

Can anybody explain Why starters are not used for motor starting in industries?

9 Answers  

Is it reuired to use house service barcket for 31/2 core 300 Sq.mm cable,if the distance between pole & shop is around 2 mtrs only or can I hang the cable with GI support in air? upto what size of cable GI serrvice btacket is necessary?

1 Answers   HAL,

how to give earthing in ships?

1 Answers  

sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"

0 Answers  

What is the difference between cylindrical-type and sandwich-type winding?

0 Answers  

Three phase power is measured with two wattmeeter for balance three phase load.the reading of one wattmeter is zero.we can conclude that the power factor of balance load is?

1 Answers  

hai...... tis is Hemanth. jst now completed electrical engineering... i wanna to apper for ap tranco exam... plzz send me the previous q's paper link......thanx in advance.

0 Answers  

What is bus-bar?

1 Answers