Civil Engineering - Water Supply Engineering

31.
The maximum permissible colour for domestic supplies based on cobalt scale, is
5 ppm
10 ppm
15 ppm
20 ppm
25 ppm.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

32.
The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed
3
5
7
9
10
Answer: Option
Explanation:
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33.
The joint used for joining the plain ends of cast iron pipes, is
flanged joint
socket and spigot joint .
dresser coupling joint
flexible joint
expansion joint.
Answer: Option
Explanation:
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34.
The bacterias which may survive with or without free oxygen, are called
Aerobic bacterias
Anaerobic bacterias
Faculative bacteria's
None of these.
Answer: Option
Explanation:
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35.
Detention time for plain sedimentation tank usually ranges from
2 to 4 hours
4 to 8 hours
6 to 10 hours
8 to 12 hours
12 to 16 hours.
Answer: Option
Explanation:
No answer description is available. Let's discuss.