WASTE WATER ENGINEERING QUIZ

The first stage of neutral process of sludge digestion, is

Acid fermentation

None of these

Acid regression

Alkaline fermentation

TRUE ANSWER : ?
YOUR ANSWER : ?

In 1000 kg of sewage, the total solids approximate

7.5 kg to 10 kg

0.5 to 1.0 kg

1 kg to 2.0 kg

5 kg to 7.5 kg

TRUE ANSWER : ?
YOUR ANSWER : ?

For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by

Kinchling

Lloyd Davis

Frubling

All listed here

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Aerobic bacterias

Oxidise organic matter in sewage

Consume organic matter as their food

All of these

Flourish in the presence of free oxygen

TRUE ANSWER : ?
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Dry water flow in a combined sewer, is

Industrial sewage

Domestic sewage

Inclusive of domestic and industrial sewage but excludes storm water

Storm water

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In the activated sludge process

Water is removed by centrifugal action

Aeration is done with an admixture of previously aerated sludge

Sludge is activated by constant stirring

Aeration is continued till stability

TRUE ANSWER : ?
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Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Unexpected large scale infiltration of stream water

Unexpected increase in the population

All of these

Under estimates of maximum and average flows

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

2

3

1.5

4

TRUE ANSWER : ?
YOUR ANSWER : ?

The gas which may cause explosion in sewers, is

Methane

Carbondioxide

Ammonia

Carbon monoxide

TRUE ANSWER : ?
YOUR ANSWER : ?

The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

50 cm

20 cm

25 cm

40 cm

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