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.Management Sciences
Category: Waste Water Engineering
For a continuous flow type of sedimentation tanks__________________?
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A. Width of the tank is normally kept about 6 m
B. Length of the tank is normally kept 4 to 5 times the width
C. Maximum horizontal flow velocity is limited to 0.3 m/minute
D. All the above
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?
A. 1.39 m
B. 1.49 m
C. 1.59 m
D. 1.69 m
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?
A. 100 mm dia.
B. 150 mm dia.
C. 225 mm dia.
D. All of these
In septic tanks, decomposition of organic bacteria, is done by_____________________?
A. Anaerobic bacteria
B. Aerobic bacteria
C. Both types of bacterias
D. None of these
The most widely used pump for lifting sewage is_________________?
A. Centrifugal pump
B. Reciprocating pump
C. Pneumatic ejector
D. Air pressure pump
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
A. Separate system
B. Combined system
C. Partially combined system
D. None of these
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
In SI units the power of sound is represented in __________________?
A. Kgs
B. Joules
C. Newtons
D. Watts
Inter-distance between ventilation columns in a sewer line is kept__________________?
A. 25 to 50 m
B. 50 m to 100 m
C. 100 m to 150 m
D. 150 m to 300 m
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