Waste Water Engineering MCQs

Option A: 0.10 cumec

Option B: 0.12 cumec

Option C: 0.15 cumec

Option D: 0.20 cumec

Correct Answer: 0.15 cumec ✔

Option A: Both A and R are true and R is the correct explanation of A

Option B: Both A and R are true but R is not a correct explanation of A

Option C: A is true but R is false

Option D: A is false but R is true

Correct Answer: Both A and R are true and R is the correct explanation of A ✔

Option A: 26.88 cumecs

Option B: 27.88 cumecs

Option C: 28.88 cumecs

Option D: 29.88 cumecs

Correct Answer: 28.88 cumecs ✔

Option A: Size of the sewer

Option B: Shape of the sewer

Option C: Roughness of sewer surface

Option D: All the above

Correct Answer: All the above ✔

Option A: Hydrogen sulphide

Option B: Carbon dioxide

Option C: Methane

Option D: Oxygen

Correct Answer: Methane ✔

Option A: Alum

Option B: Ferric chloride

Option C: Ferric sulphate

Option D: Chlorinated copperas

Correct Answer: Alum ✔

Option A: Centrifugal pump

Option B: Pneumatic ejector

Option C: Reciprocating pump

Option D: None of these

Correct Answer: Centrifugal pump ✔

Option A: The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge

Option B: The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge

Option C: The minimum design velocity of sewer pipes is taken as 0.8 m/sec

Option D: All the above

Correct Answer: All the above ✔

Option A: 15 days

Option B: 30 days

Option C: 60 days

Option D: 90 days

Correct Answer: 90 days ✔

Option A: Less than 150

Option B: Between 150 to 200

Option C: Between 200 to 300

Option D: More than 500

Correct Answer: More than 500 ✔

Option A: The sewage when running full from inside, is called internal pressure

Option B: The internal pressure if any, causes tensile stress in the pipe material

Option C: Pressure sewers are designed to be safe in tension

Option D: All the above

Correct Answer: All the above ✔

Option A: Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

Option B: A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Width of the tank is normally kept about 6 m

Option B: Length of the tank is normally kept 4 to 5 times the width

Option C: Maximum horizontal flow velocity is limited to 0.3 m/minute

Option D: All the above

Correct Answer: All the above ✔

Option A: Water test

Option B: Smoke test

Option C: Straightness test

Option D: All the above

Correct Answer: Smoke test ✔

Option A: 15 cm c/c

Option B: 22.5 cm c/c

Option C: 30 cm c/c

Option D: 50 cm c/c

Correct Answer: 22.5 cm c/c ✔

Option A: Light in weight

Option B: Not structurally strong to bear large compressive stress

Option C: Susceptible to corrosion by sulphuric acid

Option D: All the above

Correct Answer: All the above ✔