Environmental Engineering - Section 1 (5)

Directions to Solve

Environmental Engineering - Section 1

This is the branch of engineering and here in this section you
will find all the MCQs problems related to environmental engineering.

33.

Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

A.	5
B.	500
C.	1000
D.	2000

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

34.

Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

A.	hydrocarbons
B.	hydrogen flouride
C.	hydrogen sulphides
D.	nitrogen dioxide

Answer: Option B

Explanation:

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35.

Smoke is produced due to

A.	insufficient supply of combustion air and insufficient time for combustion.
B.	poor quality of fuel and improper mixing of fuel & combustion air.
C.	poor design & overloading of furnace.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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36.

Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

A.	Reynold stresses
B.	shear forces
C.	both (a) & (b)
D.	neither (a) nor (b)

Answer: Option C

Explanation:

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37.

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

A.	natural aeration of water stream.
B.	photosynthetic action of algae.
C.	both (a) & (b).
D.	neither (a) nor (b).

Answer: Option C

Explanation:

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38.

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

A.	blood poisoning.
B.	anaemia.
C.	nervous system disorder.
D.	all (a), (b) & (c).

Answer: Option D

Explanation:

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39.

H₂S present in gaseous stream can be removed by adsorption on

A.	silica gel
B.	active carbon
C.	bog iron
D.	limestone powder

Answer: Option C

Explanation:

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40.

During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

A.	Idle running
B.	Acceleration
C.	Cruising
D.	Deaccelaration

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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