Q.1.
A manhole is classified as shallow if its depth is between
Q.2.
The clarigesters are
Q.3.
The rainfall at any place may be determined by
Q.4.
Nitrogen cycle of sewage, is
Q.5.
Hydraulically equivalent, the relationship which holds good, is
Q.6.
For design of sewers, percentage of sewage discharge is assumed
Q.7.
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
Q.8.
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
Q.9.
The drainage area of a town ishectares. Itsarea is hard pavement ( K = 0.85), thearea is unpaved streets (K = 0.and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas asminutes and using the formula Ps = 900/(t +the maximum run off is
Q.10.
The sewer which transports the sewage to the point of treatment, is called
Q.11.
The standard B.O.D. of water is taken for
Q.12.
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
Q.13.
The quantity of liquid waste which flows in sewers during the period of rainfall, is known
Q.14.
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
Q.15.
Maximum permissible velocity 1.5 m/sec, is adopted in drains
Q.16.
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
Q.17.
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by
Q.18.
The value of Chezy’s constant C = 157.6/(1.+ K/ ) is used in
Q.19.
In trickling filter, B.O.D. is reduced to
Q.20.
Drop manholes at the junctions of sewer lines, are provided if
Q.21.
It is customary to design a sewer for D.W.F. on the basis of
Q.22.
Dry weather flow is:
Q.23.
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
Q.24.
The porosity of sediments in sewer pipes, is usually taken as
Q.25.
In a grit chamber of a sewage treatment plant,
Q.26.
A sewer pipe contains 1 mm sand particles of specific gravity 2.and 5 mm organic particles of specific gravity 1.the minimum velocity required for removing the sewerage, is
Q.27.
The spacing of man holes along a straight portion of a sewer ism, the diameter of the sewer may be