1451. Generally the detention period for grit chambers is kept as_______________?
A. 1 minute
B. 5 minutes
C. 2-4 hours
D. 12 hours
✅ The correct answer is option A.
Civil Engineering
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1452. The type of sewer which is suitable for both combined and separate system is_____________?
A. circular sewer
B. egg shaped sewer
C. horse-shoe type sewer
D. semi-elliptical sewer
✅ The correct answer is option B.
1453. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?
A. 1
B. 100
C. infinite
D. zero
✅ The correct answer is option B.
1454. The most commonly used sewer under culverts is_______________?
A. circular brick sewer
B. circular cast iron sewer
C. semi-elliptical sewer
D. horse-shoe type sewer
✅ The correct answer is option A.
1455. The maximum discharge of a tube-well is about_________________?
A. 5 litres/sec
B. 50 litres/sec
C. 500 litres/sec
D. 1000 litres/see
✅ The correct answer is option B.
1456. The type of valve, which is provided on the suction pipe in a tube-well, is____________?
A. air relief valve
B. reflux valve
C. pressure relief valve
D. sluice valve
✅ The correct answer is option B.
1457. Dissolved oxygen in streams is______________?
A. maximum at noon
B. minimum at noon
C. maximum at midnight
D. same throughout the day
✅ The correct answer is option A.
1458. Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ?
A. circle method
B. equivalent pipe method
C. Hardy cross method
D. electrical analysis method
✅ The correct answer is option B.
1459. The process of lagooning is primarily a means of________________?
A. reducing the excessive flow in sewers
B. disposing of sludge
C. increasing the capacity of storage re-servoirs
D. increasing flow of sewage through imhoff tanks
✅ The correct answer is option B.
1460. Sludge volume index is defined as the ratio of_______________?
A. percentage of sludge by volume to percentage of suspended solids by weight
B. percentage of sludge by volume to percentage of total solids by weight
C. percentage of suspended solids by weight to percentage of sludge by volume
D. percentage of total solids by weight to percentage of sludge by volume
✅ The correct answer is option A.