How one can say about a device (e.g: a light holder contains 20 or 30 L.E.Ds which glows when power supply is off, from which source they are getting the supply..... battery or capacitor) without removing and opening up its case ?
How one can check the charger of the mobile phone or any other charger .......... that is it working ? if , working is it delivering the required supply which is needed by the battery to charge properly ?4 7314
although ckt breakers have taken the place of old fuse. But instead of it , these older ones are still used in the industries and homes ? why .... what are their advantages and disadvantages ? which one is leading and winning the race and competition ?1064
which type of A.C motor is used in the fan (ceiling fan, exhaust fan, padestal fan, bracket fan etc) which are find in the houses ?25 61222
what are fluorescent lamps (fluorescent fixtures) & what are incandescen lamps (incandescents fixtures) ? differences between these two ?1 1460
how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?
if we want to increase the back up time of an UPS what should we do ? if we want to decrease the charging time of a battery/batteries attached with the UPS what should we do ?6 11501
what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?16 16681
What is the difference b/w Earthing and Grounding?4 5806
why dc current is supplied in america rather than ac1 3804
can any one suggest websites having study maetrials for the electrical students?1 1303
what is the order of mgnetiation current in a current transformer of 1000A/1A ratio?2 3879
generally on the roadside v hav 11kv line which is being step down to 440v line to line....so any1 can tell me which type of transformer they r using whether it is star to delta,delta to star etc...???9 10710
What is the function of attenuator in cro?
Which contains in POLE ASSEMBLY of a 11KV Kirloskar-make SF6 (Model No-FP620A12)? Will u clarify with drawing?
How to size fuse? How to size MCB?
Define rise time.
during installation time of transformer and alternator which points we have to observed?
how to setting voltage RTCC panel
My question is abt backlog.I had dropped one subject in my second year, and completed this subject in the 3rd attempt, so how many backlogs i have got?1 or 3?plz sujjest the answer as soon as possible
What is quadrantal symmetry?
What is primary and backup protection?
how much GROUND & NEUTRAL VOLT maintain in data center.
What is the difference between diesel generator engine with and without turbo charger with the same capacity?
if field breaker of generator is closed prior to its rated speed on a power generating unit. what will be the effect on generator, unit transformer and starting transformer.
How select ELCB for 32amp. socket having quantity 12Nos. We have to do this wiring in PLANT. Please Also explain the incoming cable specification.
What is difference and reason b/w -48V BTS system and 24 V BTS system. Plzzzzzzzzz tel me.
Which are resistive loads & which one are inductive loads : Refrigerator, Split air conditioner, ceiling fans, well pump, fluoresecent bulbs, T.V, CRT Monitors, Adsl Routers, C.P.U, Printers, Deep Freezers, Speakers, DVD Players, Microwave oven etc. ? Output Power for these Appliances Would be same like this : P = V * A * P.F Or would be changed ? thanks