Water Supply Engineering Questions (W4)

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 internal pressure, to which a water supply pipe is subjected to, is:


    1. full hydrostatic pressure when water in the pipe is at rest
    2. pressure head and velocity head in the pipe, when flow at full velocity is taking place
    3. (a) + water hammer pressure
    4. (b) + water hammer pressure

    View Answer
    Answer: c
    The maximum internal pressure likely to come under worst circumstances is usually taken equal to the sum of full static pressure and the water hammer pressure.

  2. The hoop tension, needing steel reinforcement along the circumference of a water supply conduit, is caused by:


    1. internal pressure due to water in the pipe
    2. water hammer pressure
    3. pressure due to tafficload
    4. both (a) and (b)

    View Answer
    Answer: d

  3. Pick up the incorrect statement.


    1. water hammer pressure is caused by opening and closing of gates, valves, pumps, etc. situated along a water main
    2. water hammer pressure is caused only momentarily
    3. the greater the haste with which a gate valve is opened or closed on a water main, the greater will be the water hammer pressure developed
    4. none of the above

    View Answer
    Answer: d

  4. Water hammer pressures can be reduced by using:


    1. fast closing valves
    2. slow closing valves
    3. critically closing time valves
    4. none of the above

    View Answer
    Answer: b

  5. The water supply mains, normally need meticulous design, to withstand:


    1. compressive stresses
    2. tensile stresses
    3. flexural stresses
    4. all of the above

    View Answer
    Answer: b

  6. The maximum pressure, which a pipe can withstand without any leakage, during hydrostatic pressure test, is called the:


    1. working pressure
    2. test pressure
    3. design pressure
    4. hydrostatic pressure

    View Answer
    Answer: b

  7. The commonly used material for water mains, which is strong, non corrodable, very durable but heavy and brittle is:


    1. RCC
    2. Steel
    3. copper
    4. cast iron

    View Answer
    Answer: d

  8. As compared to the cast iron pipes, steel water pipes are:


    1. heavier
    2. stronger
    3. durable
    4. all of the above

    View Answer
    Answer: b

  9. Steel pipes are:


    1. easily affected by acidic and alkaline atmosphere effects
    2. unable to withstand high negative pressures
    3. liable to quick rusting
    4. all of the above

    View Answer
    Answer: d

  10. Cast iron pipes, which are cast in horizontal position by ordinary sand moulding process, are called:


    1. Pit cast pipes
    2. Delavaud pipes
    3. Sand spun pipes
    4. Mcwane pipes

    View Answer
    Answer: b






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