A. Silting
B. Low discharge
C. Greasy and oily matters
D. All the above
Related Mcqs:
- Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?
A. Centrifugal pump
B. Pneumatic ejector
C. Reciprocating pump
D. None of these - Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
A. pt = 3H3p/2 Z5
B. pt = 2H3p/3 Z5
C. pt = 3H3p/2Z5
D. pt = 2 3p/3Z5 - 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 - For sewers, inverted siphon is provided for___________________?
A. One pipe
B. Two pipes
C. Three pipes
D. Four pipes - The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?
A. 20 m
B. 30 m
C. 45 m
D. 75 m - The laying of sewers is done with____________________?
A. Magnetic compass
B. Theodolite
C. Level
D. Clinometer - The minimum recommended diameter of sewers, is_________________?
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm - In sewers designed with self cleansing velocity________________?
A. The bottom is silted
B. The bottom is scoured
C. Both silting and scouring occur at the bottom
D. Neither silting nor scouring occurs at the bottom - 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 gas which may cause explosion in sewers, is_________________?
A. Carbondioxide
B. Methane
C. Ammonia
D. Carbon monoxide
