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Assertion (A): Multi-flue stacks are used where several units share one structure.

Reason (R): Each flue can then keep a high exit velocity even when its unit is at part load.

Select the correct answer from the options below.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Correct answer: Both A and R are true, and R is the correct explanation of A

A multi-flue stack lets each unit keep its own flue at full velocity while others are shut down or at part load - which is precisely the situation that would otherwise bring on stack tip downwash in a single large flue. Sharing one windshield is the structural convenience; keeping the velocity up is the reason it works well.

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