Environmental Engineering in CE MCQs

Question 1

Green house effect is accentuated by

Accepted Answer

All of the above

Answer

Deforestation

Answer

Rapid industrialisation

Answer

Increased transportation activity

Question 2

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

Accepted Answer

400

Answer

20

Answer

100

Answer

200

Question 3

Inhalation of silica dust by human being causes

Accepted Answer

Both B & C

Answer

Asphyxiation

Answer

Shortness of breath

Answer

Tuberculosis

Question 4

Pick out the correct statement.

Accepted Answer

All of the above

Answer

Noise from ball mills can be dealt with by fibre glass lined enclosures

Answer

Noise from vibrating chutes can be reduced by lining the metallic chute with rubber

Answer

Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers

Question 5

Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?

Accepted Answer

Electrostatic precipitator

Answer

Packed scrubber

Answer

Gravity settling chamber

Answer

Hydrocyclone

Question 6

Tolerable limit of nitrogen oxides in air is __________ ppm.

Accepted Answer

5

Answer

0.1

Answer

1

Answer

25

Question 7

Pick out the wrong statement.

Accepted Answer

Cooling and freezing of water kills the bacteria present in it

Answer

Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water

Answer

With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing

Answer

Dissolved oxygen content in high pressure boiler feed water should be nil

Question 8

Inorganic impurities causing water pollution is

Accepted Answer

Salts of metals

Answer

Fats

Answer

Carbohydrates

Answer

Protein

Question 9

Tri-sodium phosphate is used in boiler water treatment to reduce

Accepted Answer

Caustic embrittlement

Answer

Turbidity

Answer

Suspended silica

Answer

Dissolved oxygen