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TEST YOURSELF ( Answers , p . 6 6 2 ) Consider the following set of equations: x 1 + 2 x 2 - x

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YOURSELF
(Answers, p.662)
Consider the following set of equations:
x1+2x2-x32=0
5x1-x23+4=0
(a) How many degrees of freedom does this system possess?
(b) Which choice of a design variable would lead to an easier procedure to solve for the state variables, x1 or x3?
2. A liquid stream containing species A,B,C, and D enters a vaporizer (flow rates n1,dots, n4kgs). Essentially all of the A,25% of the B, and none of the D is vaporized. The C is distributed between the liquid and vapor products according to a known equilibrium relationship. How many degrees of freedom does this process possess?
3. Consider the equations (i)5x-3y=7,(ii)10x-3y-6z=14, and (iii)y=2z.
(a) Try to solve this system of equations for x,y, and z, and explain why you can't do it.
(b) Prove that the set of equations has one degree of freedom, choose a design variable, specify a value for it, and determine the corresponding state variable values.
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