In a sludge tank, the gas mainly produced, is_________________?
In a sludge tank, the gas mainly produced, is_________________?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide
Civil Engineering Mcqs
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A well oxidized sewage contains nitrogen mainly as___________________?
A well oxidized sewage contains nitrogen mainly as___________________?A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these -
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/l -
Self-cleansing velocity is__________________?
Self-cleansing velocity is__________________?A. Velocity at dry weather flow
B. Velocity of water at flushing
C. Velocity at which no accumulation remains in the drains
D. Velocity of water in a pressure filter -
15 cumecs, the depth d and width are related by For drains up to___________________?
15 cumecs, the depth d and width are related by For drains up to___________________?A. d = 0.2 B
B. d = 0.5 B
C. B = 0.2 d
D. B = 0.5 d -
The rate of accumulation of sludge in septic tanks is recommended as____________________?
The rate of accumulation of sludge in septic tanks is recommended as____________________?A. 30 litres/person/year
B. 25 litres/person/year
C. 30 litres/person/month
D. 25 litres/person/month -
In a trickling filter_________________?
In a trickling filter_________________?A. Filtration process is used
B. Biological action is used
C. Neither A. nor B.
D. Both A. and B. -
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours -
Hume steel pipes are__________________?
Hume steel pipes are__________________?A. Steel pipes
B. Steel shell coated from inside with cement mortar
C. Steel shell coated from outside with cement mortar
D. Both B. and C. -
The detention period for plain sedimentation water tanks, is usually____________________?
The detention period for plain sedimentation water tanks, is usually____________________?A. 4 to 8 hours
B. 8 to 16 hours
C. 16 to 24 hours
D. 24 to 36 hours