A. 1
B. 2 to 3
C. 3 to 5
D. 5 to 10
Related Mcqs:
- Design period of 40 to 50 years is adopted for_________________?
A. Branch sewers
B. Main sewers
C. Trunk sewers
D. All the above - For design purposes, the normal rate of infiltration of ground water into the sewer, is___________________?
A. 500 litres/km/cm
B. 1000 litres/km/cm
C. 1500 litres/km/cm
D. 2000 litres/km/cm - The design period of sewage treatment works in normally_________________?
A. 5 – 10 years
B. 15 – 20 years
C. 30 – 40 years
D. 40 – 50 years - The ratio of design discharge to the surface area of a sedimentation tank is called____________________?
A. Surface loading
B. Overflow rate
C. Overflow velocity
D. All of these - You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
A. Full depth
B. Half full
C. Two third full
D. Three fourth full - For design of sewers, percentage of sewage discharge is assumed_____________________?
A. 65 to 70%
B. 70 to 75%
C. 75 to 80%
D. 85% - 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 - The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________?
A. 1.5
B. 2.0
C. 3.0
D. 4.0 - If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is___________________?
A. 1045 mm
B. 1065 mm
C. 1075 mm
D. 1095 mm - If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is___________________?
A. D
B. 1.25 D
C. 1.5 D
D. 1.75 D
