Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe li

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

Correct Answer

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1. Octane number of n-heptane is assumed to be
Options
A. 100
B. 0
C. 70
D. ?

Discuss

Correct Answer: 0

2. __________ is the process of killing organism in water.
Options
A. Coagulation
B. Sterilisation
C. Disinfection
D. Sedimentation

Discuss

Correct Answer: Disinfection

3. Chemical formula of metaphosphoric acid is
Options
A. H₃PO₄
B. H₄P₂O₇
C. HPO₃
D. same as that of pyrophosphoric acid

Discuss

Correct Answer: HPO₃

4. __________ is produced by polymerisation of chloroprene.
Options
A. Thiokol (a polysulphide rubber)
B. Butyl rubber
C. Neoprene
D. Polyurathane rubber

Discuss

Correct Answer: Neoprene

5. Esterification reaction produces
Options
A. detergent
B. vanaspati
C. soap
D. mercaptans

Discuss

Correct Answer: soap

6. In distillation, overhead product contains
Options
A. only one component
B. two components
C. any number of components
D. only saturated liquid

Discuss

Correct Answer: any number of components

7. Economy of a multiple effect evaporator is not influenced much by the
Options
A. boiling point elevations
B. temperature of the feed
C. rate of heat transfer
D. ratio of the weight of the thin liquor to thick liquor

Discuss

Correct Answer: boiling point elevations

8. Pour point and freezing point is equal for
Options
A. petrol
B. diesel
C. water
D. crude petroleum

Discuss

Correct Answer: water

9. Maximum nitrogen percentage is in
Options
A. ammonium sulphate.
B. calcium ammonium nitrate.
C. urea.
D. liquid ammonia.

Discuss

Correct Answer: liquid ammonia.

10. Pressure drag does not depend upon the
Options
A. roughness of surface of the body.
B. pressure of main flow only.
C. length of the body in flow direction.
D. all (a), (b) and (c)

Discuss

Correct Answer: all (a), (b) and (c)

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Discussion

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.

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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.