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What are the number of degrees of freedom if the number of variables and number of equations are 18 and 7 respectively?

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in Basic Chemical Engineering by (74.6k points)
What are the number of degrees of freedom if the number of variables and number of equations are 18 and 7 respectively?

(a) 7

(b) 9

(c) 11

(d) 15

This question was posed to me during an interview.

The doubt is from Solving Material and Energy Balances Using Process Simulators topic in division Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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Best answer
Right option is (c) 11

The best I can explain: Number of degrees of freedom = 18 – 7 = 11.

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