Civil Engineering - Water Supply Engineering

16. 

If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is

A.
B.
C.
D.

Answer: Option C

Explanation:

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17. 

The force which develops in a pressure conduit supported on trestles, is

A. tension
B. compression
C. temperature stress
D. flexural stress.

Answer: Option D

Explanation:

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18. 

After cleaning a slow sand filter, the filtered water is not used for

A. 6 hours to 12 hours
B. 12 hours to 18 hours
C. 18 hours to 24 hours
D. 24 hours to 36 hours
E. 48 hours.

Answer: Option D

Explanation:

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19. 

A pressure conduit laid under ground, may not be subjected to

A. internal pressure of water
B. pressure due to external load
C. longitudinal temperature stress
D. longitudinal stresses due to unbalanced pressure to bends
E. none of these.

Answer: Option C

Explanation:

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20. 

The period of cleaning of a slow sand filter, is usually

A. 5 to 10 days
B. two weeks to three weeks
C. one month to three months
D. three months to six months
E. one year.

Answer: Option C

Explanation:

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