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 ?

1 Answers   ONGC,

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how to select a capacitor, i mean we use 3.5 mico ferad cap for a celling fan,but how to select a cap for 1h.p motor,etc.........

1 Answers  

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Dear All, In a 400V power system, ratio of three current transformers installed incoming switchgear is 4000/1. Maximum three phases short circuit current of this system is 48kA. One CT is installed on neutral of upstream transformer (6/0.42kV, solidly earthed) for 51G protection. Would you please inform me about the correct CT ratio of this current transformer (on neutral)?? Thanks a million

2 Answers  

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A 30KW motor running at 1450 rpm draws 56A, how would you determine if this is correct or not?

3 Answers  

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hoe we can exlain the effect of caoacitor in fans????????

1 Answers  

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how much UPS neutral erath leakage current.

0 Answers   HP,

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I'm looking for a softcopy manual set for a Credence ASL- 3000. Anyone know where I can get it?

0 Answers  

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How many Zones can be in Conventional type fire alarm system & how can we detect the fire in Conv. type FAS?

0 Answers  

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hi this is hema, r there any books in particular for the preparation of the APPSC-A.E.E(electrical), if so please mail me the names ... thank u .

0 Answers   Vizag Steel,

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How to findout raw or ups power? its not indicated in socket,

0 Answers   Novo Nordisk,

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On what principle reluctance motors work?

1 Answers  

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What is the use of Isolation Transformer, and Neutral is using for return path, finally this current is going.... but same time the voltage of the neutral should be below 1 V...

6 Answers  

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