500 Best Environmental Engineering- MCQ
Q93). In dry feeding type of coagulants, the dose of coagulant is controlled by
a).Scrapers
b).Worm wheel
c).Paddles
d).None of these
Correct Answer:
Worm wheel
Explanation:
Q94). The length of rectangular sedimentation tank should not be more than …………. The width of the tank
a).Twice
b).Three times
c).Four times
d).Six times
Correct Answer:
Four times
Explanation:
Q95). Which of the following is not a coagulating agent?
a).Ferric sulphate
b).Ferric chloride
c).Aluminium sulphate
d).Copper sulphate
Correct Answer:
Copper sulphate
Explanation:
Q96). The alum when mixed with water as a coagulant,
a).Does not effect pH value of water
b).Decreases pH value of water
c).Increases pH value of water
d).None of these
Correct Answer:
Decreases pH value of water
Explanation:
Q97). The volume of a settling basin is large due to
a).Large volumes of floc added for coagulation
b).Large amount of water entrapped into it
c).Greater amount of suspended solids to be removed
d).None of the above
Correct Answer:
None of the above
Explanation:
Q98). The process of purifying water by passing it through a bed of fine granular material, is called
a).Screening
b).Filteration
c).Coagulation
d).Sedimentation
Correct Answer:
Filteration
Explanation:
Q99). The void spaces in the filtering material act like a
a).Drain
b).Inlet
c).Tiny settling basins
d).Outlet
Correct Answer:
Inlet
Explanation:
Q100). The organic impurities in water form a layer on the top of a filtering media. Such a layer is called
a).Permeable layer
b).Filtering layer
c).Dirty skin
d).None of these
Correct Answer:
Dirty skin
Explanation: