Civil Engineering - Water Supply Engineering

11. 

Pick up the correct statement from the following :

A. The internal pressure within a pipe, is caused due to water head and hammer pressure
B. The internal pressure in a pipe running full is equal to vertical ordinate between hydraulic gradient line and centre of the pipe
C. In pressure pipes with water at rest, the pressure is equal to water head
D. Sudden closure of a valve, causes the water hammer pressure
E. All the above.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

12. 

Surface water is obtained from

A. well
B. springs
C. artesian well
D. rain.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

13. 

Hardness of water is caused due to

A. calcium sulphate
B. magnesium sulphate
C. calcium nitrates
D. calcium bicarbonates
E. all the above.

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

14. 

Flow through period, in sedimentation tanks, is

A. equal to detention period
B. more than detention period
C. less than detention period
D. detention period divided by displacement efficiency
E. none of these.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

15. 

Normal values of overflow rate for plain sedimentation tank, is

A. 250 to 500 litres/hr/m2
B. 500 to 750 litres/hr/m2
C. 750 to 1000 litres/hr/m2
D. 1000 to 1250 litres/hr/m2.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.