This is a subjective question, hence you have to write your answer in the Text-Fleld given below. (a) Polluted air is to be treated through a fabric filter ( 1m in diameter and 10m in length) at an air flow rate of 29450 cubic foot per minute. The area of the filtration is 500 square metres. Estimate the superficial velocity of the gas and the number of bags required for effecting this filtration. [1+2=3] (b) Write few sentences on: (i) Source correction method and (ii) Tape sampler [1+1=2]