environmental engineering MCQs – Page 8

Practise focused environmental engineering questions with marked answers for exam preparation and subject revision.

environmental engineering Mcqs
141. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
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A. more and less

B. more and more

C. less and more

D. less and less

142. Which of the following chemical compounds can be used for dechlorination of water ?
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A. chloramines

B. carbon dioxide

C. sulphur dioxide

D. bleaching powder

143. The effect of increasing diameter of sewer on the self cleansing velocity is_____________?
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A. fluctuating

B. to decrease it

C. to increase it

D. nil

144. The detention period for oxidation ponds is usually kept as______________?
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A. 24 hours

B. 4-8 hours

C. 3 months

D. 10 to 15 days
145. Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
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A. calcium carbonate

B. calcium hydroxide

C. sodium carbonate

D. magnesium carbonate

146. If the sewage contains grease and fatty oils, these are removed in_________________?
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A. grit chambers

B. sedimentation tanks

C. skimming tanks

D. detritus tanks

147. Which of the following sewers is preferred for combined system of sewage ?
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A. none of the above

B. circular sewer

C. rectangular sewer

D. egg shaped sewer