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Civil Engineering Objective Questions { Environmental Engineering }

78.  A manhole is classified as shallow if its depth is between
A. 0.4 to 0.5 m
B. 0.5 to 0.7 m
C. 0.7 to 0.9 m
D. 0.9 to 1.20 m

79.  A drop manhole is provided if
A. a sewer drops from a height
B. a branch sewer joins the main sewer at higher level
C. a lamp is inserted to check obstruction
D. none of these.

80.  Pick up the correct statement from the following :
A. Inlets are provided on the road surface at the lowest point for draining rain water
B. Inlets are generally provided at an interval of 30 m to 60 m along straight roads
C. Inlets having vertical openings, are called curb inlets
D. All the above.

81. For sewers, inverted siphon is provided for
A. one pipe
B. two pipes
C. three pipes
D.four pipes.

82.  The most effective arrangement for diverting excess storm water into a natural drainage, is
A. leaping weir
B. overflow weir
C. siphon spill way
D. none of these.

83.  An inverted siphon is designed generally for
A. one pipe
B. two pipes
C. three pipes
D. four pipes.

84.  Clogging of sewers, is caused due to
A. silting
B. low discharge
C. greasy and oily matters
D. all the above.

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