291. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?
A. 10 cm
B. 12 cm
C. 15 cm
D. 18 cm
✅ The correct answer is option C.
Civil Engineering Mcqs MCQs
292. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?
A. head of water (h)
B. h2
C. V/T
D. h2
✅ The correct answer is option C.
293. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?
A. 2.30 m
B. 2.40 m
C. 2.45 m
D. 2.50 m
✅ The correct answer is option C.
294. Dilution method of disposing of sewage, is not preferred to_______________?
A. When sewage is fresh
B. When diluting water has high dissolved oxygen content
C. When diluting water is used for water supply near the point of sewage disposed
D. When the diluting water is having flow currents
✅ The correct answer is option C.
295. If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
A. Q = [(4 + )/(18 + )] q
B. Q = [(18 + P)/(4 + )] q
C. Q = [(18 + )/(4 + )] q
D. Q = [(5 + )/((15 + )] q
✅ The correct answer is option C.
296. For design of sewers, percentage of sewage discharge is assumed_____________________?
A. 65 to 70%
B. 70 to 75%
C. 75 to 80%
D. 85%
✅ The correct answer is option C.
297. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
A. 0°C
B. 15°C
C. 20°C
D. 25°C
✅ The correct answer is option C.
298. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day
✅ The correct answer is option C.
299. To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
A. 45 %
B. 50 %
C. 55 %
D. 60 %
✅ The correct answer is option C.
300. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
A. Cast iron sewers
B. Cement concrete sewers
C. Glazed bricks sewers
D. Stone ware sewers
✅ The correct answer is option C.