Question

Which of the following techniques is not appropriate/used for air pollution control?

• A. Bag House Filter
• B. Cyclone Separator
• C. High Volume Sampler
• D. Electrostatic Precipitator

Hint:

Distinguish between "control" and "monitoring". Control devices (filters, precipitators, scrubbers) actively remove pollutants from an emission source. Monitoring devices (samplers, analyzers) measure the amount of pollutants present in the air.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The question asks to identify the device that is used for air pollution *monitoring* or *sampling*, rather than *control*.

Step 3: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{(A) Bag House Filter: This is an air pollution control device used to remove particulate matter from industrial gas streams by filtering the gas through large fabric bags.} \\ \bullet & \text{(B) Cyclone Separator: This is an air pollution control device that uses centrifugal force to separate particulate matter from an air stream.} \\ \bullet & \text{(C) High Volume Sampler: This is an instrument used for monitoring and measuring the concentration of particulate matter in the ambient air. It works by drawing a large known volume of air through a filter paper over a specific period. It is a sampling device, not a control device.} \\ \bullet & \text{(D) Electrostatic Precipitator (ESP): This is a highly efficient air pollution control device that removes fine particulate matter from a gas stream using the force of an induced electrostatic charge.} \\ \end{array}\]

Step 4: Final Answer:
A High Volume Sampler is used for sampling air pollution, not for controlling it.