MCQ 1 For the open drain (N = 0.025) shown in the below figure, the discharge is

(A) 28.88 cumecs (B) 27.88 cumecs (C) 29.88 cumecs (D) 26.88 cumecs

MCQ 2 Pick up the correct statement from the following:

(A) Maximum daily flow = 2 times the average daily flow (B) Maximum daily flow = average daily flow (C) Sewers are designed for minimum permissible velocity at minimum flow (D) All of the above

MCQ 14 The pressure exerted by

(A) The sewage when running full from inside, is called internal pressure (B) The internal pressure if any, causes tensile stress in the pipe material (C) Pressure sewers are designed to be safe in tension (D) All of the above

MCQ 3 For drainage pipes in buildings the test applied before putting them to use, is

(A) Water test (B) Smoke test (C) Straightness test (D) All of the above

MCQ 4 Acid regression stage of sludge digestion at a temperature 21?C extends over a period of

(A) 15 days (B) 30 days (C) 60 days (D) 90 days

MCQ 5 The coagulant which is generally not used for treating the sewage, is

(A) Alum (B) Ferric chloride (C) Ferric sulphate (D) Chlorinated copperas

MCQ 13 The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

(A) A heap (B) Plateau (C) Windrow (D) None of these

MCQ 15 If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

(A) Hydrogen sulphide (B) Carbon dioxide (C) Methane (D) Oxygen

MCQ 11 The gas which may cause explosion in sewers, is

(A) Carbondioxide (B) Methane (C) Ammonia (D) Carbon monoxide

MCQ 6 The sewer pipes

(A) Carry sewage as gravity conduits (B) Are designed for generating self-cleansing velocities at different discharge (C) Should resist the wear and tear caused due to abrasion (D) All of the above

MCQ 12 The Chezy's constant C in the formula V = C depends upon

(A) Size of the sewer (B) Shape of the sewer (C) Roughness of sewer surface (D) All of the above

MCQ 7 The discharge per unit plan area of a sedimentation tank, is generally called

(A) Over flow rate (B) Surface loading (C) Over flow velocity (D) All of the above

MCQ 10 Assertion (A): The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value. Which is the correct statement.

(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 a correct explanation of A (C) A is true but R is false (D) A is false but R is true

MCQ 8 The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

(A) 25,000 to 35,000 litres/sqm/day (B) 40,000 to 50,000 litres/sqm/day (C) 50,000 to 60,000 litres/sqm/day (D) 80,000 to 100,000 litres/sqm/day

MCQ 9 The sewer that unloads the sewage at the point of treatment is called

(A) Main sewer (B) Outfall sewer (C) Branch sewer (D) House sewer