Answer Posted / 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.
| Is This Answer Correct ? | 14 Yes | 40 No |
Post New Answer View All Answers
at work we have a 3 phase motor but on testing one phase isnt getting a reading. it runs 24 hours a day all week. stops and starts well no noise or heating. the phase isnt down to earth.is it just a bad meter reading or not? phases one and three came up with a resistance reading of 0.4 but phase 2 couldnt get anything shows up as open circuit.
What is the one main difference between ups & inverter ? And electrical engineering & electronics engineering ?
what is the difference between megger and earth resister ??
why ct's&pt'S out put called as burden,why compelsary short ckt the secondary of ct's while removing the burden?
what type of earthing do for dry fissure rock?
List the power rating of any 5 important electrical appliances used in houses.
describe the constructional features of an auto transformer and its principle operation
For RCD (Residual current device) Icu is defined. How i can find Ics for them?
3ph motor running with unequal kw and different pf what are the reasons
1- What is the Polarization Index number be good for 15KV 3c#500MCM electrical cable? 2- Can I use the IEEE Std 43-2000 to perfom the PI test? Thanks
What is difference and reason b/w -48V BTS system and 24 V BTS system. Plzzzzzzzzz tel me.
HOW TO WRITE A QUENTION ANSWER? I MEAN SHORT OR LENGHTHY ? OR FROM THE BOOK AS BOOK..... SOME TIME WE GIVE A ANS FROM THE BOOK AS LIKE BOOK ND WE GET MINIMUM 60% MARKS OR MORE THEN....... THEN HOW TO FILL THE Q-PAPER?
how does commutator convert a.c to d.c?
Is single load(eg: three phase motor) having all the components like positive,negative,zero sequence components during fault condition?
what happend to DC shunt motor if its field winding insulation becomes slightly weak? will that motor can run on full load or not explain in detail. thanks
