Water Supply Engineering Questions (W3)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.

1. The devices, which are installed for drawing water from different water sources, are called:

   
   

   1. Filters
   2. Intakes
   3. Outlets
   4. Inlets

   View Answer

   Answer: b



2. Pick up the incorrect statement.

   
   

   1. The intake point should, as far as possible, be located in deep waters
   2. The intake point should be located upstream of the point of sewage disposal
   3. The intake point on the meandering rivers, should preferably be located on the convex banks
   4. None of the above

   View Answer

   Answer: c
   The intake point on the meandering rivers, should preferably be located on the concave banks



3. Simple submerged intakes may be suitable to:

   
   

   1. large water supply projects on rivers
   2. small water supply projects on streams
   3. small water supply projects on lakes
   4. both (b) and (c)

   View Answer

   Answer: d
   Small submerged intakes are used for small water supply projects drawing water from streams or lakes having relatively little change in water surface elevation throughout the year.



4. Dry intake towers, when compared to wet intake towers, need:

   
   

   1. heavier and costly construction
   2. lighter and cheaper construction
   3. practically the same section

   View Answer

   Answer: a



5. Pick up the incorrect statement.

   
   

   1. dry intake towers are preferred to wet intake towers
   2. wet intake towers help in withdrawing water from different levels of a storage reservoir
   3. a medium sized river intake well can preferably be adopted, when the water is withdrawn from the upstream of a barrage
   4. none of the above

   View Answer

   Answer: b



6. Pressure pipes are exclusively used for carrying water supplies, because:

   
   

   1. such pipes are closed, and hence not exposed to pollution anywhere, enroute
   2. since the water runs under pressure in these pipes, pollution from outside surrounding cannot find entry, even if some joits are loose
   3. such pipes can go up and down the hills and valleys, thus requiring lesser length
   4. all of the above

   View Answer

   Answer: d



7. The velocity in water conduit is normally kept between:

   
   

   1. 0.5 and 1.0 m/s
   2. 0.8 and 1.2 m/s
   3. 0.9 and 1.5 m/s
   4. 1.0 and 1.5 m/s

   View Answer

   Answer: c



8. Which of the following formula is most appropriate to design pressure pipes?

   
   

   1. Darcy Weisbach formula
   2. Manning's formula
   3. Chezy's formula
   4. Dupit's formula

   View Answer

   Answer: a



9. In the design of water supply conduits, the larger value of the design velocity, if adopted will:

   
   

   1. reduce the cost of the pipe
   2. increase the cost of pumping
   3. both (a) and (b)
   4. none of the above

   View Answer

   Answer: c



10. The appropriate diameter of a water main for supplying $9 MLD$ of water with a velocity of $1.5 m/s$, is:

    
    

    1. 0.3 m
    2. 0.6 m
    3. 0.9 m
    4. 1.0 m

    View Answer

    Answer: a
    $9 MLD=9000 {m^3}/day = \frac{9000}{24 \times 3600}$
    $=0.104167 {m^3/sec}$
    $Volume = Area \times velocity$
    $0.104167 = \pi \times radius^2 \times 1.5$
    $radius = 0.15 m$
    $diameter = 0.3 m$

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