The main disadvantage of cement concrete sewers is________________?

Question: COD of raw municipal sewage may be in the range of about __________ mg/litre.
[A].

1-2

[B].

5-10

[C].

90-120

[D].

1500-2500

Answer: Option C

Explanation:

No answer description available for this question.

Question: In water treatment plant, zeolite process is used to remove the __________ of water.
[A].

acidity

[B].

alkalinity

[C].

hardness

[D].

iron & zinc

Answer: Option C

Explanation:

No answer description available for this question.

Question: ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
[A].

industrial chimney exhaust.

[B].

automobiles exhaust.

[C].

photochemical reaction in polluted atmosphere.

[D].

burning of domestic fuel.

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.