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Assertion (A): A degrees of freedom analysis should precede any attempt to solve a flowsheet.
Reason (R): It shows whether the problem is solvable and which unit to start from.

  • 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

Both are true and the reason gives both benefits. Counting degrees of freedom before solving reveals whether the problem is determinate at all, which saves attempting the impossible, and unit by unit it identifies which unit has zero degrees of freedom and can therefore be solved first - giving a starting point and an order for the rest of the flowsheet.

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