Civil Engineering - GATE Exam Questions

26. 

A saturated clay stratum draining both at the top and bottom undergoes 50 percent consolidation in 16 years under an applied load. If an additional drainage layer were present at the middle of the clay stratum, 50 percent consolidation would occur in

A. 2 years
B. 4 years
C. 8 years
D. 16 years

Answer: Option B

Explanation:

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27. 

Water flows at a rate of 10 m3/s in a rectangular channel 3 m wide. The critical depth of flow is

A. 1.13 m
B. 2 m
C. 1.45 m
D. 1.04 m

Answer: Option D

Explanation:

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28. 

Coagulation-flocculation with alum is performed :

A. immediately before chlorination
B. immediately after chlorination
C. after rapid sand filtration
D. before rapid sand filtration

Answer: Option D

Explanation:

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29. 

Blue baby disease (methaemoglobinemia) in children is caused by the presence of excess

A. Chorides
B. Nitrates
C. Fluoride
D. Lead

Answer: Option B

Explanation:

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30. 

Breakpoint chlorination of water involves addition of chlorine in an amount sufficient to:

A. react with any ammonia and readily oxidisable organic matter
B. kill Giardia cysts
C. react with inorganic matter
D. reduce bacterial growth in filters

Answer: Option A

Explanation:

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