ENVIRONMENTAL ENGINEERING QUIZ

Sewerage system is designed for

Maximum flow only

Maximum and minimum flow

Minimum flow only

Average flow only

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The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

9800

10100

9500

10920

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The chemical most commonly used to increase speed of sedimentation of sewage is

Lime

Copper sulphate

Sulphuric acid

Sodium permanganate

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A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called

House sewer

Lateral sewer

Sub-main sewer

Main sewer

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The velocity of flow of water in a sedimentation tank is about

5 to 10 cm/sec

15 to 30 cm/hour

15 to 30 cm/minute

15 to 30 cm/sec

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A sewer that receives the discharge of a number of house sewers is called

Lateral sewer

Intercepting sewer

Sub-main sewer

House sewer

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Laying of sewers is usually done with the help of

Sight rails and boning rods

A Theodolite

A compass

A plane table

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The rate of BOD exerted at any time is

Directly proportional to BOD satisfied

Directly proportional to BOD remaining

Inversely proportional to BOD remaining

Inversely proportional to BOD satisfied

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The suitable method for disinfection of swimming pool water is

Lime treatment

Ultra violet rays treatment

Chlorination

By using potassium permanganate

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The self cleansing velocity for all sewers in India is usually

Less than 1.0 m/sec

1.0 m/sec to 1.2 m/sec

3.0 m/sec to 3.5 m/sec

1.5 m/sec to 2.0 m/sec

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