Civil Engineering - Water Supply Engineering
Exercise :: Water Supply Engineering - Section 4
31. |
Gravity conduits |
A. |
carry water under gravity | B. |
follow the hydraulic gradient line | C. |
are carried on trestles in valleys and depressions | D. |
are carried through tunnels in deep cuttings | E. |
All the above. |
Answer: Option E
Explanation:
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32. |
Carbonates in water produce |
A. |
temporary hardness | B. |
permanent hardness | C. |
acidity | D. |
alkanity. |
Answer: Option A
Explanation:
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33. |
Hardness of water is caused by |
A. |
presence of soap lather | B. |
presence of chlorides and sulphates of sodium and potassium | C. |
presence of bicarbonates, sulphates or chlorides of calcium and magnesium | D. |
turbidity. |
Answer: Option C
Explanation:
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34. |
A slow sand filter is cleaned if its filter head is higher than |
A. |
10 cm to 20 cm | B. |
20 cm to 40 cm | C. |
40 cm to 70 cm | D. |
70 cm to 120 cm | E. |
120 cm to 150 cm. |
Answer: Option D
Explanation:
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35. |
A strainer type well sunk through three pervious layers intervened by three impervious aquicludes, draws water from |
A. |
top most pervious layer | B. |
central pervious layer | C. |
lowest pervious layer | D. |
all the pervious layers. |
Answer: Option D
Explanation:
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