ENVIRONMENTAL ENGINEERING IN CE QUIZ

Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Chlorination

Sedimentation

Biological oxidation

Skimming off

TRUE ANSWER : ?
YOUR ANSWER : ?

Deaeration of high pressure boiler feed water is done to reduce

Its silica content

Caustic embrittlement

Its dissolved oxygen content

Foaming from boilers

TRUE ANSWER : ?
YOUR ANSWER : ?

Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

Oxidation of unburnt hydrocarbon fuel in the second compartment

Conversion of CO into CO₂ in the second compartment

Conversion of NOx into N₂ and NH₃ in the first compartment

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

(ii) and (iv)

(ii) and (iii)

(i) and (ii)

(i) and (iv)

TRUE ANSWER : ?
YOUR ANSWER : ?

In large thermal power stations very fine particulates present in flue gas are removed by

Dust catcher

Bag filter

Wet scrubber

Electrostatic precipitators

TRUE ANSWER : ?
YOUR ANSWER : ?

TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1

25

100

1000

TRUE ANSWER : ?
YOUR ANSWER : ?

High noise levels produced during operation of fans and compressors can be reduced by using

Mufflers (silencers)

Lagging of noisy duct

None of these

Accoustical absorbent

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a secondary air pollutant?

Ozone

All of these

Photochemical smog

Sulphur dioxide

TRUE ANSWER : ?
YOUR ANSWER : ?

Peroxyacyl nitrate (PAN), a pollutant is found in the

Flue gas of coal based power plant

Automobile exhaust

Exhaust of nitric acid plant

Exhaust of sulphuric acid plant

TRUE ANSWER : ?
YOUR ANSWER : ?

Photochemical smog is formed from automobile exhaust

Appears only on sunny days

By reaction of hydrocarbon & nitric oxide in presence of sunlight

Is harmful for crops and trees also besides causing eye irritation & asthma

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?