Q.1.

For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

Q.2.

For design of sewers, percentage of sewage discharge is assumed

Q.3.

If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Q.4.

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

Q.5.

Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated.

Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.

Q.6.

For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

Q.7.

The detention time (t) of a settling tank, may be defined as the time required for

Q.8.

In sewage, the solids in mg per litre is

Q.9.

If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is

Q.10.

The water carried sewerage system removes

Q.11.

The moisture content of a sludge is reduced fromtoin a sludge digestion tank. The percentage decrease in the volume of sludge, is

Q.12.

Traps

Q.13.

In case of sewer lines

Q.14.

The design period of sewage treatment works in normally

Q.15.

Water content of sewage is about

Q.16.

Stoneware sewers are available in size

Q.17.

Inter-distance between ventilation columns in a sewer line is kept

Q.18.

For estimating the peak run off the rational formula Q = 0.KpA was evolved by

Q.19.

The sewerage system originates from

Q.20.

The porosity of sediments in sewer pipes, is usually taken as

Q.21.

Imhoff cone is used to measure

Q.22.

The sludge does not contain waste water from

Q.23.

Pick up the correct statement from the following :

Q.24.

For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

Q.25.

The factor responsible for purification of sewage in river is

Q.26.

Pick up the correct statement from the following :

Q.27.

The factor responsible for purification of sewage in river is

Q.28.
Aerobic bacterias
Q.29.
The pH value of sewage is determined with the help of
Q.30.
The effluent of a septic tank is
Q.31.
A manhole is generally provided at each
Q.32.
The asbestos cement sewers are
Q.33.
The sludge does not contain waste water from
Q.34.
In a trickling filter
Q.35.
The sewage treatment in septic tanks is due to
Q.36.
Flocculated particles do not change their
Q.37.
Removal of oil and grease from sewage, is known
Q.38.
Drop manholes are the manholes
Q.39.
Dried sewage after treatment is used as
Q.40.
Which one of the following statements regarding septic tanks is wrong?
Q.41.
The temperature affects the
Q.42.
Which one of the following gases is most significant as air pollutant?
Q.43.
The minimum diameter of sewer to be adopted is
Q.44.
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is
Q.45.
Oxidation process results in the formation of
Q.46.
Are available in size Stoneware sewers
Q.47.
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
Q.48.
In very first stage of decomposition of the organic matter in sewage
Q.49.
A rainfall may be classified as acidic if its pH value is less or equal to
Q.50.
The recommended detention period for grit chambers is