Online Chemical Engineering Test - Environmental Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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Dust collection efficiency of a cyclone separator depends upon its

diameter.

inlet gas velocity.

overall height.

all (a), (b) & (c).

[#]

Scale formation in boiler is controlled by

preheating of feed water.

reduction in hardness, silica & alumina in feed water.

keeping the pH value of feed water just below 7.

eliminating H₂S in feed water.

[#]

The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by

biological oxygen pond.

aerated lagoons.

trickling filters.

gravity separator having oil skimming devices.

[#]

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

blood poisoning.

anaemia.

nervous system disorder.

all (a), (b) and (c).

[#]

Pick out the wrong statement.

Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions.

Inhalation of pollutant carbon monoxide results in death by asphyxiation.

Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles.

Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere.

[#]

Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

biological oxidation.

skimming off.

settling out using chemical reagents.

chlorination.

[#]

Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

120

150

180

[#]

Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.

moderately

highly

extremely

very extremely

[#]

Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

coal ash

potassium cyanide

ortho-xylene

none of these

[#]

10.

Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

thermosphere

stratosphere

troposphere

mesosphere

[#]

11.

The lowest layer of atmosphere is known as the

stratosphere

troposphere

ionosphere

none of these

[#]

12.

In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

1 to 2

4 to 5

9 to 10

15 to 20

[#]

13.

Arsenic pollutant is not generated in____industries.

tanneries

glass & ceramic

beverages

any of these.

[#]

14.

Pick out the wrong statement

Low ozone layer thickness in polar regions is due to cold climatic conditions

Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine.

Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.

Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing minamate disease.

[#]

15.

Algae growth in water is controlled by

deoxidation

chlorination

bleaching

aeration

[#]

16.

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

conversion of CO into CO₂ in the second compartment.

conversion of NO_x into N₂ and NH₃ in the first compartment.

oxidation of unburnt hydrocarbon fuel in the second compartment.

all (a), (b) and (c).

[#]

17.

The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

ionosphere

troposphere

stratosphere

none of these

[#]

18.

Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

mercury

lead

fluoride

arsenic

[#]

19.

The term Biological Oxygen Demand (BOD) is used in relation to

potable water

cooling water

distilled water

industrial effluents

[#]

20.

Pick out the wrong statement.

The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere.

Stratosphere is rich in ozone and is located just above the troposphere.

Troposphere is a turbulent dusty zone containing much of water vapor and clouds.

The earth's atmosphere is an envelope of gases extending upto a height of about 200 kms.

[#]

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