Civil Engineering MCQs

Page No. 170

Air binding phenomena in rapid sand filters occur due to_________________?


aexcessive negative head


bmud ball formation


chigher turbidity in the effluent


dlow temperature



Cleaning is done by________________?


a scraping and removal in filters slow sand


b back washing in slow sand filters


c back washing in rapid sand filters


dA and B


View Answer A and B

Period of cleaning of slow sand filters is about________________?


a24 – 48 hours


b10-12 days


c2-3 months


d1-2 year


View Answer 2-3 months

Disinfection of water results in______________?


aremoval of turbidity


bremoval of hardness


ckilling of disease bacteria


dcomplete sterilisation



Double filtration is used_______________?


ato increase the filtration slow sand filters capacity of


b to increase the filtration rapid sand filters capacity of


cfor isolated buildings like pools, hotels etc swimming


d all of the above



The disinfection efficiency of chlorine increases by_______________?


a decreasing the time of contact


bdecreasing the temperature of water


cincreasing the temperature of water


donly C


View Answer only C

The process in which the chlorination is done beyond the break point is known as_________________?


aprechlorination


b post chlorination


csuper chlorination


d break point chlorination


View Answer super chlorination

The treatment of water with bleaching powder is known as________________?


aprechlorination


b super chlorination


cdechlorination


dhypochlorination


View Answer hypochlorination

Which of the following chemical compounds can be used for dechlorination of water ?


a carbon dioxide


bbleaching powder


csulphur dioxide


dchloramines


View Answer sulphur dioxide

As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?


asmaller


blarger


csame


dnone of the above


View Answer smaller

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