Civil Engineering MCQs

Page No. 28

In case of Imhoff tanks_____________________?


aThe shape is rectangular

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bDetention period is 2 hours

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cThe velocity of flow is restricted to 0.30 m/minute

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dAll the above

✓


View Answer All the above

The maximum depth of sedimentation tanks, is kept__________________?


a3 m

✓


b3.5 m

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c 4 m

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d4.5 m

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View Answer 3 m

A sewer running partially full and hurried with back filled, fails in compression due to_________________?


aWeight of the pipe

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bWeight of the back fill

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cSuperimposed traffic loads

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dAll the above

✓


View Answer All the above

Kjeldahl nitrogen is a mixture of___________________?


aAmmonia and nitrogen

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bNitrogen and organic nitrogen

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cOrganic nitrogen and ammonia

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dAll the above

✓


View Answer All the above

Nitrogen cycle of sewage, is____________________?


aLiberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen

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b Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates

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c Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia

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dFormation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

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The minimum diameter of a sewer is kept __________________?


a10 cm

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b 15 cm

✓


c20 cm

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d25 cm

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View Answer 15 cm

Pick up the correct statement from the following _________________?


aThe materials separated by screens, is called screenings

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bThe screenings are disposed off either by burning or by burial or by dumping

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c The process of burning the screenings, is known as compositing

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dAll the above

✓


View Answer All the above

An inverted siphon is designed generally for____________________?


aOne pipe

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bTwo pipes

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cThree pipes

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dFour pipes

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View Answer Three pipes

Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?


a Less than 0.01 mm

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bLess than 0.05 mm

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cLess than 0.1 mm

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dGreater than 0.1 mm

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View Answer Greater than 0.1 mm

In sewers designed with self cleansing velocity________________?


aThe bottom is silted

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bThe bottom is scoured

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cBoth silting and scouring occur at the bottom

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d Neither silting nor scouring occurs at the bottom

✓



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