Civil Engineering - Water Supply Engineering

41. 

Pickup the incorrect statement from the following :

A. The invert of pressure conduit is independent of the grade of the hydraulic gradient line
B. The pressure conduits may be taken uphill upto a maximum height of 8.3 m
C. Aqueducts and tunnels sections are generally kept circular
D. None of these.

Answer: Option D

Explanation:

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42. 

Detention period of a settling tank is

A. average theoretical time required for water to flow through the tank
B. time required for flow of water to fill the tank fully
C. average time for which water is retained in tank
D. ratio of volume of basin of a sedimentation tank to the rate of flow
E. all the above.

Answer: Option E

Explanation:

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43. 

Pick up the incorrect statement from the following :

A. Water disinfected with ozone is free from any odour
B. Ozone removes bacterias as well as colour and odour
C. ozonised water becomes tasteless
D. None of these.

Answer: Option C

Explanation:

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44. 

The order of existence of three portions of water in a reservoir from the bottom to top is

A. useful storage + surcharge storage + dead storage
B. useful storage + dead storage + surcharge storage
C. dead storage + useful storage + surcharge storage
D. surcharge storage + useful storage + dead storage
E. none of these.

Answer: Option C

Explanation:

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45. 

The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is

A. 24 cm
B. 26 cm
C. 28 cm
D. 30 cm
E. 32 cm.

Answer: Option D

Explanation:

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