civil engineering MCQs – Page 246

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs

4901. Disposal to sewage in large cities, is done in__________________?
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A. Purification

B. Dilution

C. Irrigation

D. Oxidation

4902. The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?
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A. 2 to 3 mm

B. 3 to 5 mm

C. 8 to 10 mm

D. 5 to 8 mm

4903. The ratio of minimum hourly flow to the average flow of sewage is_________________?
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A. 2-Jan

B. 4-Jan

C. 4-Mar

D. 1/3

4904. In a sludge tank, the gas mainly produced, is_________________?
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A. Oxygen

B. Nitrogen

C. Hydrogen

D. Carbon dioxide

4905. The non-clog pump which permits solid matter to pass out with the liquid sewage, is________________?
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A. Centrifugal pump

B. None of these

C. Reciprocating pump

D. Pneumatic ejector

4906. The algae dies out in the zone of_____________________?
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A. Degradation

B. Cleaner water

C. Active decomposition

D. Recovery

4907. A manhole is generally provided at each__________________?
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A. Change of gradient

B. Junction

C. All the above

D. Bend

4908. The sewers___________________?
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A. Must be of adequate size to avoid over flow

B. Must flow under gravity to full

C. Must be laid at least 2 to 3 m deep to collect /water from the basements

D. All the above

4909. Cowl is provided at___________________?
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A. Lower end of ventilating column

B. Upper end of the manhole

C. First step in manhole

D. Upper end of ventilating column

4910. With self cleansing velocity in sewers___________________?
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A. Silting occurs at bottom

B. Scouring occurs at bottom

C. Both silting and scouring occur at bottom

D. Neither silting nor scouring occurs at bottom

4911. In olden days the type of section adopted in trunk and out fall sewers was__________________?
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A. Horse shoe shaped

B. Parabolic shaped

C. Egg shaped

D. Circular shaped

4912. Design period of 40 to 50 years is adopted for_________________?
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A. All the above

B. Branch sewers

C. Trunk sewers

D. Main sewers

4913. In a grit chamber of a sewage treatment plant ____________________?
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A. Depth of 0.9 m to 1.20 m is kept

B. All the above

C. Flow velocity 0.15 m to 0.3 m/sec is kept

D. One minute of detention period is kept

4914. Large diameter sewers subjected to external pressure alone, are reinforced ______________________?
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A. Near the inner surface of the pipe

B. Near the outer surface of the pipe

C. Both A. and B.

D. With elliptical cage

4915. The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________?
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A. all of these

B. Sag pipe

C. Depressed sewer

D. Inverted syphon

4916. The small sewers are cleaned by____________________?
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A. Flushing

B. Cane rodding

C. None of these

D. Wooden pills

4917. The most efficient cross-section of sewers in a combined sewerage system is________________?
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A. Parabolic

B. Rectangular

C. Circular

D. New egged

4918. Pick up the correct statement from the following?
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A. The sewers may be carried up and down the hills and valleys

B. The water supply pipes carry pure water free from solid particles

C. The sewer pipes are generally laid along level hills

D. The water supply pipes get clogged if flow velocity is less than self cleansing velocity

4919. Oxidation process results in the formation of___________________?
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A. Carbon dioxide

B. Nitrates

C. All the above

D. Sulphates

4920. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
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A. Sulphuric acid

B. Nitric acid

C. Hydrochloric acid

D. Citric acid

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