Environmental Engineering Mcqs

This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Environmental Engineering ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Environmental Engineering Mcqs comprehensively.

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1.
The chemical most commonly used to speed sedimentation of sewage is

Sulphuric acid

Copper sulphate

Lime

Sodium ermanganate

2.
The gas from sludge digestion tanks is mainly composed of

Nitrogen

Hydrogen sulphide

Methane

Carbon monoxide

3.
The quantity of chlorine in ppm required to satisfactorily chlorinate sewage is usually

125-150

95-120

60-90

0-25

5.
The ratio of oxygen available to the oxygen required for stabilization of sewage is called

Biochemical oxygen demand

Relative stability

Bacterial-stability factor

Oxygen-ion concentration

6.
In the design of grit chambers

Temperature is an important factor

The maximum velocity of flow is 1 ft/s

The detention period should be at least 30 min

There should be a 5 to 1 ration of length to depth

7.
The process of lagooning is primarily a means of

Increasing the capacity of storage reservoirs

Increasing flow of sewage through Imhoff tanks

Reducting the excessive flow in sewers

Disposing sludge

8.
The biochemical treatment of sewage effluents is essentially a process of

Reduction

Oxidation

Dehydration

Alkalinization

9.
In treating turbine water a popular coagulant is

Calcium sulphate

Chlorine

Ferric sulphate

Iodine

10.
Septic tanks are primarily used for

The aerobic decomposition of deposited sweage solids

Separation of deposited solids

Anaerobic decomposition of deposited solids

Separation of oil and grease scums.

12.
For protection of acquatic life in a fresh water stream sewage effluent should never lower the dissolved oxygen content lower than

15 ppm

10 ppm

5 ppm

20 ppm

13.
Ecological system or ecosystem refers to

A group of individuals of any one kind of organism

All of the population occupying a given area

The community and non-living environment working together

A portion of the earth where living objects can be found

14.
Chloramines are used in water treatment

For disinfection

For taste and colour control

As algicides

For weed control in reservoirs

15.
The most efficient equipment for removal of sub micron dust particles from blast furnace gas is

Venturi scrubber

Gravity settling chamber

Electrostatic precipitator

Cyclone separator

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