302. Antisyphonage pipe is fitted
A. at the end of septic tanks
B. on manholes
C. with a W.C. trap
D. at the beginning of sewer line.
303. Chlorination of water is done for the removal of
A. bacterias
B. suspended solids
C. sediments
D. hardness.
304. The effluent of a septic tank is
A. fit for discharge into any open drain
B. foul and contains dissolved and suspended solids
C. as good as that from a complete treatment
D. none of these.
305. Dried sewage after treatinexit-is used as
A. fertilizer
B. building material
C. chemical for lowering B.O.D.
D. base material for paints.
306. In sewers the velocity of flow should not be
A. more than the self-cleansing velocity
B. less than the self-cleansing velocity
C. less than 10 m/sec
D. more than 20 in/sec.
307. Self-cleansing velocity is
A. velocity at dry weather flow
B. velocity of water at flushing
C. velocity at which no accumulation remains in the drains
D. velocity of water in a pressure filter,
308. Hydraulic mean radius is
A. mean radius of sewer
B. difference in heads between two points in circular pipes
C. mean of radii in a pipe line of varying cross-sections
D. cross-sectional area/wetted perimeter.
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