Description : Can I replace Nickel Cadmium batteries with NiMH?
Last Answer : Yah, that’s fine. Just don’t put your NiMH batteries in the NiCad charger.
Description : What are the disadvantages of the maintenance free battery?
Last Answer : The life of battery is only five years. The state of charge of a battery not knowing by the specific gravity of a battery. We can know by voltage only.
Description : What are the advantages and disadvantages of 415V English Electric breaker?
Last Answer : Advantages 1. Auto reclosing shutters. 2. Proven wiping contacts. 3. Sturdy rugged mechanism. 4. Reliable aux. Switches contacts. 5. Slow closing facility independent of closing spring. ... also. No neutral bus bar link, we cannot finger contact resistance since fixed on bus side.
Description : What is the rating of switchyard battery charger and batteries?
Last Answer : Switchyard is having Float cum boost charger of 282 V DC maximum and 100 Amps rated charger of six-pulse full wave thyristerised controlled rectifier. Batteries are tubular 220 V DC. +ve plate is made ... minutes. Specific gravity 1110 5 and specific gravity after 10 hrs discharge is 1150 5.
Description : What are the tests for battery?
Last Answer : Conduct test – to check the capacity batteries Impedance test – to check the utilization of active materials.
Description : What are the main parts of lead acid battery?
Last Answer : a. Container b. Lead dioxide positive plates c. Lead negative plates d. Post strap and seal assemble e. Separators and retainers f. Sulphuric acid electrolyte g. Inter cell connector (lead plated copper)
Description : Why battery capacity limits to 20 minute?
Last Answer : Battery cost is more. It is better to restore class 3 faster by DG set then putting large battery. 20 min, is enough to shutdown the unit safely.
Description : What types of lighting fittings are used in the battery room?
Last Answer : Flame proof acid resistant
Description : Why aged battery consumes more water?
Last Answer : As aging increases, antimony migrates to negative plate Æ secondary cell reaction. Therefore more charging current require Æ more water consumption.
Description : How H2 O2 generated in lead acid battery?
Last Answer : At end of charge, when most of the Pb is converted. H2 O2 generated from H2O. O2 appears as gas at positive plate. H2 at negative plate, i.e. gassing starts.
Description : What are the effects of temperature in lead acid battery?
Last Answer : Higher electrolyte temp - ah capacity increases but life reduces. Lower electrolytic temp - ah capacity reduces since chemical reaction rate reduces.
Description : Why battery room should be located separately in a power station?
Last Answer : Possibility of battery explosion Corrosive atmosphere by acid spray. Fire hazard.
Description : Why lead acid battery requires so much large initial charging?
Last Answer : Initially for a new battery, negative plate will be PbO instead of Pb. To convert all of them back to Pb, we need so much prolonged initial charging.
Description : What is the approximate voltage produced by a nickel-cadmium battery cell? A. 1.25 volts B. 1.50 volts C. 2.20 volts D. 6.05 volts
Last Answer : Answer: A
Description : The plates of a NiCad storage battery are made of ________. A. potassium hydroxide with a small amount of sulfuric acid B. lead and lead peroxide C. silver oxide and lead sulfate D. combinations of nickel powder and nickel & cadmium salts
Last Answer : Answer: D
Description : To determine the state of charge of a nickel-cadmium battery, you would use a/an _____________. A. voltmeter B. hydrometer C. ammeter D. potentiometer
Description : To determine the state of charge of a nickel-cadmium battery, you should ___________. A. check the electrolyte with a hydrometer B. use the constant specific gravity method C. use a nonbreakable mercury thermometer D. connect a voltmeter to the battery terminals
Description : When charging a nickel-cadmium battery, ____________. A. the charging rate should be lessened when gassing commences B. overcharging should be avoided C. the specific gravity of the electrolyte will be ... by the state of charge D. add distilled water just prior to charging to insure proper mixing
Last Answer : Answer: C
Description : To test the state of charge of a nickel-cadmium battery, you should use a/an ____________. A. ammeter B. voltmeter C. hydrometer D. potentiometer
Last Answer : Answer: B
Description : A nickel-cadmium battery is receiving a normal charge and gases freely. The charging current should _____________. A. be increased B. be decreased C. be cut off and the battery allowed to cool D. remain the same
Description : Local action in a nickel-cadmium battery is offset by _____________. A. separating the positive and negative plates with plastic spacers B. separating the positive and negative plates with resin impregnated spacers C. adding a small amount of lithium hydroxide to the electrolyte D. trickle charging
Description : Which of the following statements concerning nickel-cadmium batteries is true? A. When mixing electrolyte always add acid to the water. B. Nickel-cadmium batteries can be charged and ... The electrolyte of an idle nickel-cadmium battery must be replaced monthly to maintain battery condition.
Description : The electrolyte used in a nickel-cadmium battery is distilled water and ______________. A. diluted sulfuric acid B. potassium hydroxide C. lead sulfate D. zinc oxide
Description : Is there an easy way to install a radio battery?
Last Answer : What kind of radio ?
Description : Can you recharge a mostly dead 9 volt battery by plugging a fresh one into the terminals?
Last Answer : you’ll end up ruining both and possibly start a fire.
Description : What type of battery is in the newer I Phones?
Last Answer : answer:The iPhone 4 has a Lithium-ion battery. The difference is mainly the manner in which the electrolyte is held. Li-po packs are a variation of Li-ion packs that are easier to make into various shapes but have a few quirks and are less mature technology.
Description : Anyone have a Samsung Behold II? Does the battery life suck for you, too?
Last Answer : answer:@lilikoi Do you have FaceBook or some other app running in the background? ? Android can drain your battery with multitasking app’s in background. It is not just the talk time that eats the battery.
Description : What should I do about a battery that is leaking white stuff into my favorite little clock?
Last Answer : I would make a paste with baking soda and water. Use that to try and break down the white stuff (use sparingly). The white stuff is battery acid and it is best to avoid touching it. Rubber gloves are your friend.
Description : How important is the first initial battery charging session on your new cellphone?
Last Answer : Read the user’s manual, and there will be specific instructions for charging your particular unit.
Description : Is my motorcycle battery hosed?
Last Answer : Is the old battery under warranty? I would take it to the place you purchased it and have it tested and chances are they will give you credit toward the new battery if it is indeed dead. From ... batteries do not have the same Lazarus qualities that car batteries have and do not rise from the dead.
Description : I put a rechargeable battery through the wash and was wondering whether it's safe to charge anymore or not.
Last Answer : Let it dry completely, and try it. I don’t think it can hurt anything. Either it will charge, or it won’t.
Description : What chronic problem can kill a car battery over time?
Last Answer : Not a mechanic, but could it be the starter?
Description : Can you recommend a battery pack, with female USB output, that holds two (not four) AA batteries?
Last Answer : If you get the regular male plug battery pack you can get a male to female converter. Yet cyberguys.com for the converter.
Description : Lightweight WAP that can be battery powered?
Last Answer : answer:Just curious as to why you need a battery powered AP? I would just use one with a power injector (power over ethernet).
Description : My gateway laptop needs a new battery. Where should I buy it?
Last Answer : If your laptop is a Gateway then I’d keep the battery and replace the laptop.
Description : What is the advantage of CMM relay over normal Inv. O/C current relay?
Last Answer : Inv. O/C relay under protects at low current and over protects at high currents. CMM: accounts for both +ve and -ve sequence currents i.e. Single phasing / unbalance supply conditions ... closely matched to motor heating characteristic. So it is better than thermal overload relay also.
Description : Why fuses with fusing factor more than 1.5 is not allowed in PVC cables?
Last Answer : Because PVC cables have low thermal capacity than paper cables. Full loading of PVC only possible if it has close excess current protection (i.e.) Fusing Factor = 1.5
Description : What is advantage of cast resin CT’s?
Last Answer : Can withstand bursting forces under short ckt, protect damages against external causes impervious to moisture.
Description : Where wound type CT used and where not used?
Last Answer : Used where low CT ratio req. Not used where high short ckt. Current exists.
Description : What is the safety reason to keep the contactor / MCC remote from motor?
Last Answer : Contactor = sparking equipment. Not suiting for hazardous location.
Description : Why OLR time set high for belt driven fans?
Last Answer : Because acceleration time is high.
Description : How two fuses in-series are discriminated?
Last Answer : Total I2 t of minor fuse should be less than pre-arcing I2 t of major fuse. Major fuse should be greater than 1.5 times the minor fuse.
Description : What is the advantage of lower cut off current?
Last Answer : Less electromagnetic forces on contactor / CB’s
Description : How the contact resistance can increase?
Last Answer : Humidity + salty air, dust, poor contact pressure
Description : Can we file the pitted contacts of contactor?
Last Answer : No, use emery paper and etc.
Description : Why pick up voltage is more than drop out voltage?
Last Answer : Initially air gap is more. Large force is required to overcome the high reluctance initially. After closing air gap is reduced. Hence drop voltage is reduced.
Description : What material used for contactor?
Last Answer : Silver-nickel for
Description : Why pure silver is not used in contactor?
Last Answer : Affected by sulphur, mechanical or arcing damages (adv. Lower voltage drop)
Description : Why copper contact are not used in contactor?
Last Answer : Because corrosion rate increases. Poor surface property , large closing force required.
Description : Why shading rings provided in armature core of ac contactor. Why not for dc contactor?
Last Answer : Because the force developed is not steady in ac therefore contacts will chatter but if shading ring is used force developed becomes steady due to splitting of phases of flux, therefore contacts becomes bounce free and humming sound reduces.