The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?

Related Mcqs:

1. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?

   A. check valve
   B. sluice valve
   C. safety valve
   D. scour valve

2. The type of valve, which is provided on the suction pipe in a tube-well, is____________?

   A. air relief valve
   B. reflux valve
   C. pressure relief valve
   D. sluice valve

3. The velocity of flow of water in a sedimentation tank is about__________________?

   A. 5 to 10 cm/sec.
   B. 15 to 30 cm/sec.
   C. 15 to 30 cm/minute
   D. 15 to 30 cm/hour

4. Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are true but R is not the correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

5. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

   A. total alkalinity
   B. total hardness
   C. total hardness – total alkalinity
   D. non carbonate hardness

6. The velocity of flow does not depend on_______________?

   A. grade of sewer
   B. length of sewer
   C. hydraulic mean depth of sewer
   D. roughness of sewer

7. The type of sewer which is suitable for both combined and separate system is_____________?

   A. circular sewer
   B. egg shaped sewer
   C. horse-shoe type sewer
   D. semi-elliptical sewer

8. The depression of water table in a well due to pumping will be maximum_______________?

   A. at a distance R from the well
   B. close to the well
   C. at a distance R/2 from the well
   D. none of the above
   where R is the radius of influence

9. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?

   A. 0.2 to 0.4
   B. 0.4 to 1.0
   C. 2 to 4
   D. 5 to 7

10. On standard silica scale, the turbidity in drinking water should be limited to_______________?

    A. 10 ppm
    B. 20 ppm
    C. 30 ppm
    D. 50 ppm