The velocity of flow of water in a sedimentation tank is about__________________?

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.

Question: Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
[A].

with greater number of blades.

[B].

of increased diameter.

[C].

both (a) & (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
[A].

1

[B].

3

[C].

7

[D].

20

Answer: Option D

Explanation:

No answer description available for this question.