ENVIRONMENTAL ENGINEERING IN CE QUIZ

Scale formation in boiler is controlled by

Preheating of feed water

Keeping the pH value of feed water just below 7

Eliminating H₂S in feed water

Reduction in hardness, silica & alumina in feed water

TRUE ANSWER : ?
YOUR ANSWER : ?

Inhalation of silica dust by human being causes

Asphyxiation

Both B & C

Shortness of breath

Tuberculosis

TRUE ANSWER : ?
YOUR ANSWER : ?

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

0.1

25

1000

100

TRUE ANSWER : ?
YOUR ANSWER : ?

Main pollutants released from iron & steel industry is

CO, CO₂ & SO₂

CO₂, H₂S & NO₂

H₂S, NO & SO₃

SO₃, NO₂ & CO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Lagging of noisy duct

None of these

Accoustical absorbent

Mufflers (silencers)

TRUE ANSWER : ?
YOUR ANSWER : ?

Removal of __________ is accomplished by aeration of water.

Dissolved gases

Dissolved solids

Suspended solids

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Lagoons used for purification of polluted water

All of these

Use micro-organisms/bacteria in presence of dissolved oxygen

Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds

Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre

TRUE ANSWER : ?
YOUR ANSWER : ?

'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.

Lime

Uranium ore

Coal

Iron ore

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation

Fermentation

Reduction

Dehydration

TRUE ANSWER : ?
YOUR ANSWER : ?

Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes

Anaemia

Blood poisoning

All of these

Nervous system disorder

TRUE ANSWER : ?
YOUR ANSWER : ?