A Best Way To Crack Gorenment Job Exams

Civil Engineering Objective Questions { Environmental Engineering }

71.  Stone ware pipes are
A. highly resistant to sulphide corrosion
B. highly impervious
C. hydraulically efficient because of their smooth interior surface
D. specially suited to pressure pipes

72. The sewer which resists sulphide corrosion, is
A. Brick sewer
B. Cast iron sewer
C. R.C.C. sewer
D. Lead sewer

73.  For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
A. 100 cm
B. 120 cm
C. 140 cm
D. 160 cm

74. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
A. 1 in 100 upward
B. 1 in 500 upward
C. 1 in 100 downward
D. 1 in 503 upward.

75.  In case of sewer lines
A. water test is carried out to check water tightness of the joints
B. test for straightness is carried out with the help of a lamp and mirror
C. obstruction test is carried out with the help of smooth ball of diameter 13 mm
D. all the above.

76.  A manhole is generally provided at each
A. bend
B. junction
C. change of gradient
D. all the above.

77.  The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be
A. 0.9 cm
B. 1.2 m
C. 1.5 m
D. > 1.5 m.

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