civil engineering MCQs – Page 243

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 Review each marked answer and report any item that may be outdated or unclear.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
4841. Most common method of prestressing used for factory production is________________?
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A. Lee-Macall system

B. Magnel-Blaton system

C. Freyssinet system

D. Long line method
4842. Prestress loss due to friction occurs________________?
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A. only in post-tensioned beams

B. only in pretensioned beams

C. in both post-tensioned and preten-sioned beams

D. none of the above

4843. In a spherical dome the hoop stress due to a concentrated load at crown is_______________?
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A. compressive everywhere

B. partly compressive and partly tensile

C. tensile everywhere

D. zero

4844. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?
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A. compressive and tensile

B. tensile and compressive

C. both compressive

D. both tensile

4845. Select the incorrect statement?
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A. Bleeding can be minimized by adding pozzuolana finer aggregate

B. Bleeding can be increased by addition of calcium chloride

C. none of the above

D. Lean mixes bleed more as compared to rich ones

4846. In counterfort type retaining walls_____________?
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A. e="color: #003f1a;">2. the heel slab is designed as a continuous slab
B. e="color: #003f1a;">4. the heel slab is designed as a cantilever

C. correct answer is?

D. e="color: #003f1a;">3. the vertical slab is designed as a cantilever
E. ="color: #003f1a;">1. the vertical slab is designed as a continuous slab
4847. In a counterfort retaining wall, the main reinforcement is provided on the_______________?
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A. e="color: #003f1a;">4. inclined face in back counterEort

B. correct answer is

C. e="color: #003f1a;">3. bottom face in back counterfort
D. e="color: #003f1a;">2. inclined face in front counterfort
E. ="color: #003f1a;">1. bottom face in front counterfort
4848. Pick up the correct statement from the following?
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A. All the above

B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river

C. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers

D. Solubility of oxygen in sewage is 95% of that of distilled water

4849. Dry weather flow is__________________?
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A. Average daily rate of flow

B. Water supply allowance per capita

C. Average monthly rate of flow

D. Average annual rate of flow

4850. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?
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A. None of these

B. Centrifugal pump

C. Pneumatic ejector

D. Reciprocating pump

4851. For drainage pipes in buildings the test applied before putting them to use, is__________________?
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A. Water test

B. Straightness test

C. Smoke test

D. All the above

4852. The pressure exerted by_____________?
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A. Pressure sewers are designed to be safe in tension

B. All the above

C. The internal pressure if any, causes tensile stress in the pipe material

D. The sewage when running full from inside, is called internal pressure

4853. Acid regression stage of sludge digestion at a temperature 21C extends over a period of______________?
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A. 30 days

B. 90 days

C. 60 days

D. 15 days

4854. Hydraulic mean radius is_______________?
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A. Mean of radii in a pipe line of varying cross -sections

B. Mean radius of sewer

C. Difference in heads between two points in circular pipes

D. Cross-sectional area/wetted perimeter
4855. The asbestos cement sewers are_________________?
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A. Susceptible to corrosion by sulphuric acid

B. Not structurally strong to bear large compressive stress

C. Light in weight

D. All the above
4856. For a continuous flow type of sedimentation tanks__________________?
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A. Length of the tank is normally kept 4 to 5 times the width

B. Width of the tank is normally kept about 6 m

C. Maximum horizontal flow velocity is limited to 0.3 m/minute

D. All the above
4857. For treating the sewage of a large city, you will recommend_________________?
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A. Sedimentation tanks with high rate trickling filters

B. A plant consisting of Imhoff tanks with low rate trickling filters

C. None of these

D. A sedimentation tank and an activated sludge treatment plant
4858. The sewer which received discharge from two or more main sewers, is known as_______________?
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A. A trunk sewer

B. A main sewer

C. An intercepting sewer

D. An outfall sewer

4859. The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________?
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A. 0.10 cumec

B. 0.12 cumec

C. 0.15 cumec

D. 0.20 cumec

4860. R.M.O. expenses include___________________?
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A. Running expenses

B. Maintenance expenses

C. All the above

D. Operation expenses