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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 3068How 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 10152although 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 ?
2028which 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 74801what are fluorescent lamps (fluorescent fixtures) & what are incandescen lamps (incandescents fixtures) ? differences between these two ?
1 2827how 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 4015if 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 15070what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
CG,
2081whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?
16 25758generally 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 15655Post New Electrical Engineering Questions
How to Prepare preventive maintenance shedule of machine tool.
What are the basic component of a cro?
Dear sir, my knowledge about cable size determination is limited. Though I read examples I could not calculate the Cable size required for electric driven pump 40 KW, 380 Volt, 50 HZ, 50 meter from transformer and it is three phase star delta starting. Please help as there is no one in my surroundings to help.
I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and pulse duration 0.125ms and feeding it to a transformer since i want the pulse to get amplified around 60V. At the output amplification s happening but the pulse is changed to a spike, can you tell me what could be the reason? (an ordinary transformer 220V-12V stepdown transformer is reverse connected ie. now it is 12V-220V stepup and voltage amplification happens)
What happen Grid EARTH plat got cut.
Which thing is maximum in RLC circuit at resonance a)power consumption b)inductive current c)capacitive voltage
How to set a Zone 1 distance relay for distribution feeder?
What is the formula formula for Busbar sizing and what are the things to be consider for Busbar Calculation?
How to calculate approximate load loss of a distribution transformer by knowing %ge imp of transformer?
1) Explain why we don't link the two earthing system ht and mv on a pole mounted transformer sub-station.
HOW TO CALCULATE S/C,O/C,E/F OF ACB.
slipring induction motor starting time Lrs operating why lrs starting time lrs outer body didn't get shock
Differentiate between ideal and non-ideal voltage sources?
What is an iron loss or core loss pi?
if 6 earth pit value is 1.5 ohm then what should be the number of earth pit to make the value .8 ohm
