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
Related Mcqs:
- 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 - Which of the following sewers is preferred for combined system of sewage ?
A. circular sewer
B. egg shaped sewer
C. rectangular sewer
D. none of the above - The minimum and maximum diameters of sewers shall preferably be_________________?
A. 15 cm and 100 cm
B. 15 cm and 300 cm
C. 30 cm and 450 cm
D. 60 cm and 300cm - Laying of sewers is usually done with the help of________________?
A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table - Corrosion in concrete sewers is caused by______________?
A. septic conditions
B. dissolved oxygen
C. chlorine
D. nitrogen - The main disadvantage of cement concrete sewers is________________?
A. less strength
B. difficulty in construction
C. difficulty in transportation due to heavy weight
D. less life - A sewer that receives the discharge of a number of house sewers is called________________?
A. house sewer
B. lateral sewer
C. intercepting sewer
D. submain sewer - Which of the following retards the self purification of stream ?
A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above - 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 - Settling velocity increases with_______________?
A. specific gravity of solid particles
B. size of particles
C. depth of tank
D. temperature of liquid
