Electrical Engineering MCQs

Page No. 199

Which of the following has lower specific gravity V__________?


aDilute H2S04


bConcentrated H2SO4


cWater


dAny of the above


View Answer Water

Which of the following battery is used for air-craft _____________?


a Lead-acid battery


bNickel-iron battery


cDry cell battery


dSilver oxide battery


View Answer Nickel-iron battery

In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?


ato reduce evaporation of water from electrolyte


bto exclude dirt and foreign matter from the electrolyte


c to discharge both of the above functions


dto discharge none of the above functions



Hydrogen evolved during charging produces explosive mixture when it is more than___________?


a2%


b4%


c6%


d 8%


View Answer 8%

Which of the following primary cells has the highest voltage___________ ?


aManganese-alkaline


bCarbon-zinc


c Lithium


d Mercury


View Answer Lithium

For a cell to work, which of the following condition(s) become necessary ___________?


aTwo electrodes of different meta’s should be inserted in the electrolyte, not touching each other


bElectrolyte must chemically react with one of the electrodes


c Electrolyte liquid or paste should be conducting


dAll above three conditions are necessary



Charging a sulphated battery at high rate results in___________?


a boiling of electrolyte due to gassing


bwarping of plates


c damage to separators, cell caps covers and battery case due to excessive temperature


dall above


View Answer all above

Extent of corrosion in the underground metal work depends upon___________?


aamount of moisture


btype of metals


ctype of soil chemicals


dall above factors


View Answer all above factors

Mercury cell has which of the following characteristics ____________?


aFlat discharge current-voltage curve


bHigh power to weight ratio


cComparatively longer shelf life under adverse conditions of high temperature and humidity


dAll of the above


View Answer All of the above

Which of the following primary cells has the lowest voltage_________ ?


aLithium


b Zinc-chloride


cMercury


dCarbon-zinc


View Answer Mercury

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