Settling velocity increases with_______________?

Related Mcqs:

1. The settling velocity of a particle in a sedimentation tank increases if______________?

   A. particle size is decreased
   B. the surface area of tank is increased
   C. the depth of tank is decreased
   D. none of the above

2. The settling velocity of a particle in a sedimentation tank increases if_________________?

   A. particle size is decreased
   B. the surface area of tank is increased
   C. the depth of tank is decreased
   D. none of the above

3. The settling velocity of a particle in a sedimentation tank depends on__________________?

   A. depth of tank
   B. surface area of tank
   C. both depth and surface area of tank
   D. none of the above

4. The amount of coagulant needed for coagulation of water increases with_______________?

   1) increase in turbidity of water
   2) decrease in turbidity of water
   3) increase in temperature of water
   4) decrease in temperature of water
   The correct answer is?

   A. (1) and (2)
   B. (1)and (4)
   C. (2) and (3)
   D. (2) and (4)

5. The disinfection efficiency of chlorine increases by_______________?

   1) decreasing the time of contact
   2) decreasing the temperature of water
   3) increasing the temperature of water
   The correct answer is ?
   A. only (1)
   B. both (1) and (2)
   C. both (1) and (3)
   D. only (3)

6. 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

7. The self cleansing velocity for all sewers in India is usually_________________?

   A. less than 1.0 m/sec
   B. 1.0 m/sec to 1.2 m/sec
   C. 1.5 m/sec to 2.0 m/sec
   D. 3.0 m/sec to 3.5 m/sec

8. 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

9. The effect of increasing diameter of sewer on the self cleansing velocity is_____________?

   A. to decrease it
   B. to increase it
   C. fluctuating
   D. nil

10. 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