Civil Engineering MCQs

Page No. 170

Air binding phenomena in rapid sand filters occur due to_________________?


aexcessive negative head

✓


bmud ball formation

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chigher turbidity in the effluent

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dlow temperature

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Cleaning is done by________________?


a scraping and removal in filters slow sand

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b back washing in slow sand filters

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c back washing in rapid sand filters

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dA and B

✓


View Answer A and B

Period of cleaning of slow sand filters is about________________?


a24 – 48 hours

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b10-12 days

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c2-3 months

✓


d1-2 year

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View Answer 2-3 months

Disinfection of water results in______________?


aremoval of turbidity

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bremoval of hardness

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ckilling of disease bacteria

✓


dcomplete sterilisation

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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

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d all of the above

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The disinfection efficiency of chlorine increases by_______________?


a decreasing the time of contact

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bdecreasing the temperature of water

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cincreasing the temperature of water

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donly C

✓


View Answer only C

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


aprechlorination

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b post chlorination

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csuper chlorination

✓


d break point chlorination

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View Answer super chlorination

The treatment of water with bleaching powder is known as________________?


aprechlorination

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b super chlorination

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cdechlorination

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dhypochlorination

✓


View Answer hypochlorination

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


a carbon dioxide

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bbleaching powder

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csulphur dioxide

✓


dchloramines

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View Answer sulphur dioxide

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


asmaller

✓


blarger

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csame

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dnone of the above

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View Answer smaller

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