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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 4
26.
Pick out the correct statement.
Noise from ball mills can be dealt with by fibre glass lined enclosures.
Noise from vibrating chutes can be reduced by lining the metallic chute with rubber.
Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers.
all (a), (b) & (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
BOD of raw municipal sewage may be in the range of about __________ mg/litre.
1-2
5-10
150-300
2000-3000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
food industry.
municipal sewage treatment.
petroleum refinery.
iron & steel plant.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.
0.01
0.1
1
4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
dental cavities
scale formation
water-borne disease
corrosion
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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