Civil Engineering - Waste Water Engineering

1. 

The most dangerous pollutant in vehicular emissions is

A. CO
B. SO2
C. CO2
D. O3.

Answer: Option A

Explanation:

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2. 

If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

A. 50 mg/l
B. 100 mg/l
C. 150 mg/l
D. 200 mg/l
E. 250 mg/l.

Answer: Option E

Explanation:

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3. 

The clarigesters are

A. circular septic tanks
B. rectangular septic tanks
C. circular Imhoff double tanks with bottom hoppers
D. circular Imhoff double storey tanks without bottom hoppers.

Answer: Option D

Explanation:

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4. 

Rate of flow of sewage is generally assumed

A. more than the rate of water supply
B. equal to the rate of water supply
C. less than the rate of water supply
D. at 150 litres per capita.

Answer: Option C

Explanation:

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5. 

Maximum permissible velocity 1.5 m/sec, is adopted in drains

A. with beds of rocks and gravels
B. lined with stones
C. both (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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