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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 ?
CMC,
1 3004How 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 10017although 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 ?
1949which 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 74124what are fluorescent lamps (fluorescent fixtures) & what are incandescen lamps (incandescents fixtures) ? differences between these two ?
1 2750how 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 ?
ONGC,
1 3944if 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 14889what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
CG,
2025whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?
16 25270generally 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 15404Post New Electrical Engineering Questions
what is ps impedance test
1.main parts of generator? what is used A-check,B-check,C- check? 2.what is FM200 system in data centers? 3.difference between pac,ahu?
what is the ground fault relay,which purpose it will be use,clearly tell me plz
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?
Whether amorphous core transformer is commercialized or not:Name of company making amorphous core transformer and what are different rating?
what is a synchronizing lamp ?
Explain difference between stand by earth fault and residual earth fault protection?
Where servomechanism is used?
distribution is maximum done by a)radial b)network c) parallel d)b & c
Why in ESP Positive earthed
how many joint can done in HT line and what is life of the joint
What is a slack bus?
what is the terminal voltage of dc series generator running at rated speed at no load?
Write the force balance equation of m ideal mass element.
What’s electric traction?
