ENVIRONMENTAL ENGINEERING IN CE QUIZ

Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400

20

200

100

TRUE ANSWER : ?
YOUR ANSWER : ?

BOD of raw municipal sewage may be in the range of about __________ mg/litre.

5-10

2000-3000

150-300

1-2

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)

Causes increase in sea level

Acts as a green house gas thereby raising earth's temperature

Inhances the green house effect

Causes asphyxia

TRUE ANSWER : ?
YOUR ANSWER : ?

Sulphur dioxide present in the industrial chimney exhaust gases causes

Respiratory & lung disease

Corrosion of building materials

All of these

Reduction in plant's productivity owing to acid rain

TRUE ANSWER : ?
YOUR ANSWER : ?

Siderosis is a disease caused by the inhalation of __________ dust.

Silica

Coal

Iron

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Solid content in most of the domestic sewage is about __________ percent.

5

10

0.001

0.1

TRUE ANSWER : ?
YOUR ANSWER : ?

Corrosion in boilers can be prevented by

All of these

Deaeration of feed water

Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

Enhancing pH of feed water by adding alkali

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most detrimental for water used in high pressure boiler?

Silica

Turbidity

Phenol

Dissolved oxygen

TRUE ANSWER : ?
YOUR ANSWER : ?

H₂S present in gaseous stream can be removed by adsorption on

Active carbon

Limestone powder

Bog iron

Silica gel

TRUE ANSWER : ?
YOUR ANSWER : ?

Radioactive substances present in the polluted water stream can be removed by

Adsorption in ion exchange materials

Biological oxygen treatment

None of these

Coagulation and filtration

TRUE ANSWER : ?
YOUR ANSWER : ?