civil engineering MCQs – Page 247

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 Review each marked answer and report any item that may be outdated or unclear.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
4921. Antisyphonage pipe is fitted_______________?
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A. At the beginning of sewer line

B. On manholes

C. With a W.C. trap

D. At the end of septic tanks

4922. The ratio of depths at partial flo________________?
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A. 1

B. 1

C. (1

D. (1
4923. A rain sanitary sewer is constructed to carry_________________ ?
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A. Storm sewage

B. Surface water

C. Ground water

D. Sanitary sewage
4924. In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?
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A. Combined system

B. Separate system

C. Partially separate system

D. None of these

4925. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
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A. Is doubled

B. Is trebled

C. Is only provided

D. Is not enough

4926. The most efficient cross section of sewers in a separate sewerage system is__________________?
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A. Rectangular

B. New egged

C. Parabolic

D. Circular
4927. In the activated sludge process__________________?
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A. Sludge is activated by constant stirring

B. Aeration is continued till stability

C. Aeration is done with an admixture of previously aerated sludge

D. Water is removed by centrifugal action

4928. The self-cleansing velocity of water flowing through pipe lines, is___________________ ?
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A. 0.5 metre/sec

B. 1 metre/sec

C. 2 metres/sec

D. 0.25 metre/sec

4929. In normal conditions, the period for sludge digestion, is_______________?
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A. 10 days

B. 20 days

C. 60 days

D. 30 days
4930. A manhole is classified as shallow if its depth is between_________________?
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A. 0.4 to 0.5 m

B. 0.7 to 0.9 m

C. 0.9 to 1.20 m

D. 0.5 to 0.7 m

4931. In 1000 kg of sewage, the total solids approximate___________________?
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A. 5 kg to 7.5 kg

B. 0.5 to 1.0 kg

C. 1 kg to 2.0 kg

D. 7.5 kg to 10 kg

4932. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is____________________?
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A. [(100 P1)/(100 + P2)] V1

B. [(100 + P1)/(100 P2)] V1

C. [(100 P1)/(100 P2)] V1

D. [(100 + P2)/(100 P1)] V1

4933. Rate of flow of sewage is generally assumed__________________?
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A. Less than the rate of water supply

B. At 150 litres per capita

C. Equal to the rate of water supply

D. More than the rate of water supply

4934. Sewer manholes are generally provided at________________?
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A. The change of direction

B. The junctions of sewers

C. All of these

D. The change of gradient

4935. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?
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A. 75 m

B. 30 m

C. 45 m

D. 20 m

4936. Clogging of sewers, is caused due to_______________?
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A. Low discharge

B. Greasy and oily matters

C. All the above

D. Silting

4937. The laying of sewers is done with____________________?
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A. Magnetic compass

B. Clinometer

C. Level

D. Theodolite

4938. The ratio of design discharge to the surface area of a sedimentation tank is called____________________?
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A. Overflow velocity

B. Overflow rate

C. Surface loading

D. All of these
4939. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?
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A. 4 hours

B. 3 hours

C. 2 hours

D. 5 hours

4940. Inter-distance between ventilation columns in a sewer line is kept__________________?
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A. 50 m to 100 m

B. 100 m to 150 m

C. 25 to 50 m

D. 150 m to 300 m