ENVIRONMENTAL ENGINEERING QUIZ

The settling velocity of a particle in a sedimentation tank depends on

Surface area of tank

None of these

Both depth and surface area of tank

Depth of tank

TRUE ANSWER : ?
YOUR ANSWER : ?

The suitable layout of distribution system for a city with roads of rectangular pattern is

Grid iron system

Radial system

Ring system

Dead end system

TRUE ANSWER : ?
YOUR ANSWER : ?

Standard BOD is measured at

20°C - 5 day

30°C - 5 day

20°C - 1 day

25°C - 3 day

TRUE ANSWER : ?
YOUR ANSWER : ?

Corrosion in concrete sewers is caused by

Dissolved oxygen

Chlorine

Septic conditions

Nitrogen

TRUE ANSWER : ?
YOUR ANSWER : ?

The main disadvantage of oxidation pond is that

Large area is required for construction

Maintenance and operation cost are high

None of these

BOD removal is very low

TRUE ANSWER : ?
YOUR ANSWER : ?

The alum, when added as a coagulant in water

Does not affect pH value of water

Decreases pH value of water

Does not require alkalinity in water for flocculation

Increases pH value of water

TRUE ANSWER : ?
YOUR ANSWER : ?

Activated carbon is used for

Removing hardness

Removing odours

Removing corrosiveness

Disinfection

TRUE ANSWER : ?
YOUR ANSWER : ?

Sewerage system is designed for

Average flow only

Maximum flow only

Maximum and minimum flow

Minimum flow only

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate of filtration in slow sand filters in million litres per day per hectare is about

100 to 150

500 to 600

50 to 60

1400 to 1500

TRUE ANSWER : ?
YOUR ANSWER : ?

Alkalinity in water is expressed as milligrams per litre in terms of equivalent

Calcium hydroxide

Magnesium carbonate

Sodium carbonate

Calcium carbonate

TRUE ANSWER : ?
YOUR ANSWER : ?

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