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.Management Sciences
Category: Waste Water Engineering
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
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A. Kinchling
B. Lloyd Davis
C. Frubling
D. All the above
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________?
A. 0.68 m
B. 0.88 m
C. 1.36 m
D. 1.76 m
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
A. 0.30 m/sec
B. 0.35 m/sec
C. 0.40 m/sec
D. 0.45 m/sec
Facultative bacteria survive in_____________________?
A. The presence of oxygen
B. The absence of oxygen
C. Both cases A. and B.
D. Neither A. nor B.
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?
A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 2 hours
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?
A. 50 mg/l
B. 100 mg/l
C. 150 mg/l
D. 250 mg/l
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of these
For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
A. H2SO4
B. HNO3
C. HCl
D. None of these
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?
A. Initial demand
B. First stage demand
C. Carbonaceous demand
D. All of these
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