500 Best Irrigation Engineering MCQ
Q89). In the design of a sedimentation tank, the essential factor to be considered is
a).Period of detention
b).Sludge capacity
c).Velocity of flow
d).All of these
Correct Answer:
All of these
Explanation:
Q90). The velocity of flow in any sedimentation tank should not exceed
a).0.05 mm/s
b).0.5 mm/s
c).5 mm/s
d).50 mm/s
Correct Answer:
5 mm/s
Explanation:
Q91). The efficiency of rectangular sedimentation tank for a given discharge, can be increased by
a).Increasing the depth of tank
b).Decreasing the depth of tank
c).Increasing the surface area of tank
d).Decreasing the surface area of tank
Correct Answer:
Increasing the surface area of tank
Explanation:
Q92). The most common coagulant is
a).Magnesium sulphate
b).Alum
c).Chlorine
d).Bleaching powder
Correct Answer:
Alum
Explanation:
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: