Discussion
Assertion (A): A venturi scrubber has the highest running cost of the common devices.
Reason (R): Fine particle collection in a wet device is obtained only by expending contacting power.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. The contacting power principle holds that fine particle collection in a wet device is bought with the power expended in contacting gas and liquid, and in a venturi that power appears as a pressure drop of 5 to 20 kPa. The fan bill that follows - hundreds of kilowatts on a large unit - is what makes the venturi the most expensive of the common devices to run.
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