Civil Engineering Waste Water Online Test, Civil Engineering Mock Test

The minimum recommended diameter of sewers, is

Aerobic bacterias

The rate of accumulation of sludge in septic tanks is recommended as

If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

Pick up the correct statement from the following :

The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.
Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

Pick up the correct statement from the following :

In olden days the type of section adopted in trunk and out fall sewers was

For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

In a fully mechanised composting plant, involves

Self-cleansing velocity is

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

An inverted siphon is designed generally for

A rainfall may be classified as acidic if its pH value is less or equal to

When drainage to sewage ratio is 20, the peak dry weather flow is

For treating the sewage of a large city, you will recommend

The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

The screens are fixed

In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

Pick up the in-correct statement from the following :

Clogging of sewers, is caused due to

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

The coagulant widely used for sewage treatment, is

House connections to the laterals is generally made by

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

Dilution method of disposing off sewage, is not preferred to