Air Pollution-2

1. In-situ cross stack analysers work behind which of the following principles?

A Differential absorption spectroscopy

B Gas-filter correlation spectroscopy

C Differential absorption & Gas-filter correlation spectroscopy

D None of the mentioned

Answer: C

2. The permissible concentration of PM 10 in air is

A 60µg/m3

B 40µg/m3

C 50µg/m3

D 20µg/m3

Answer: A

3. Sampling should always be carried under conditions of

A Isokinetic

B Sub-Isokinetic

C Super-Isokinetic

D All of the above

Answer: A

4. The efficiency of collection by impingement is high for the particles whose diameter is  ----- or greater

A 0.001µ

B 1 µ

C 0.5 µ

D 0.01 µ

Answer: B

5. When velocity in probe is greater than velocity in stack _____ condition is achived

A Isokinetic

B Sub-Isokinetic

C Super-Isokinetic

D All the above

Answer:  C

6. Which of the following is objective of Sampling

A Formulating and testing air pollution models

B Scientific Investigations

C Specify sources

D All of the above

Answer: D

7. Which of the following is not a sampling device

A Absorber's

B Sedimentation

C Condensers

D Plastic containers

Answer: B

8.What is Air Quality Index

A It tells about sound pollution

B Measures SO2 concentration

C Measures ozone levels in your area

D Checks colour of air

Answer: C

9. What is the primary standard level for carbon monoxide for assuring air quality?

A 10ppm

B 90ppm

C 1ppm

D 9ppm

Answer:  D

10. Sample is said to be collected as Isokinetic Sampling when______

A Vp > Vs

B Vp = Vs

C Vp =<Vs

D All the above

Answer: B

11. Which of the following analyser is used for oxygen analysis?

A Electrocatalytic

B Polarographic

C Conductive

D Amperometry

Answer: A

12. In-situ in-stack analysers are used for measuring concentrations of which of the following gases

A Ammonia

B Sulphur dioxide

C Nitrogen monoxide

D All of the above

Answer: D

13. Stages of sampling includes:

A Statistical studies

B Continuous and Intermittent Sampling

C Size of Sample

D All of the above

Answer: D

14. Electroanalytical monitors rely on which of the following methods?

A Polarography and amperometric analysis

B Polarography and electrocatalysis

C Polarography, electrocatalysis and conductivity

D All of the above 

Answer: D

15. Potential difference of _________ is applied for Electrostatic Precipitator

A 5-10kv

B 12-30kV

C 100kv

D 1-15kv

Answer: B

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