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Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

CHEMICAL ENGINEERING, Environmental Engineering /
Question: Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
[A].

85

[B].

105

[C].

125

[D].

145

Answer: Option B

Explanation:

No answer description available for this question.

Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels. Read More »

CHEMICAL ENGINEERING, Environmental Engineering

The biological decomposition of organic substances in wastes controlled conditions is called

CHEMICAL ENGINEERING, Environmental Engineering /
Question: The biological decomposition of organic substances in wastes controlled conditions is called
[A].

incineration

[B].

biological oxidation

[C].

composting

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

The biological decomposition of organic substances in wastes controlled conditions is called Read More »

CHEMICAL ENGINEERING, Environmental Engineering

Fine grit present in sewage is removed in the __________ during sewage treatment.

CHEMICAL ENGINEERING, Environmental Engineering /
Question: Fine grit present in sewage is removed in the __________ during sewage treatment.
[A].

grit chamber

[B].

detritus tank

[C].

trickling filter

[D].

skimming tank.

Answer: Option B

Explanation:

No answer description available for this question.

Fine grit present in sewage is removed in the __________ during sewage treatment. Read More »

CHEMICAL ENGINEERING, Environmental Engineering

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

CHEMICAL ENGINEERING, Environmental Engineering /
Question: In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
[A].

1 to 2

[B].

4 to 5

[C].

9 to 10

[D].

15 to 20

Answer: Option B

Explanation:

No answer description available for this question.

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

CHEMICAL ENGINEERING, Environmental Engineering

A shallow pond in which the sewage is retained and biologically treated is called

CHEMICAL ENGINEERING, Environmental Engineering /
Question: A shallow pond in which the sewage is retained and biologically treated is called
[A].

oxidation

[B].

Imhoff tank

[C].

lagoon

[D].

skimming tank

Answer: Option A

Explanation:

No answer description available for this question.

A shallow pond in which the sewage is retained and biologically treated is called Read More »

CHEMICAL ENGINEERING, Environmental Engineering

During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

CHEMICAL ENGINEERING, Environmental Engineering /
Question: During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
[A].

filtration

[B].

digestion

[C].

sedimentation

[D].

both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank. Read More »

CHEMICAL ENGINEERING, Environmental Engineering

__________ substances present in sewage are removed in grit chamber during sewage treatment.

CHEMICAL ENGINEERING, Environmental Engineering /
Question: __________ substances present in sewage are removed in grit chamber during sewage treatment.
[A].

Organic

[B].

Fatty

[C].

Inorganic

[D].

Dissolved

Answer: Option C

Explanation:

No answer description available for this question.

__________ substances present in sewage are removed in grit chamber during sewage treatment. Read More »

CHEMICAL ENGINEERING, Environmental Engineering