Question

What are the total degrees of freedom if the number of species are 5, total streams are 2, stream temperature 2, stream pressure 2 and heat released 1?

(a) 1

(b) 5

(c) 6

(d) 12

I have been asked this question at a job interview.

Enquiry is from Degrees of Freedom Analysis topic in chapter Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

Answer 1

Right choice is (d) 12

Best explanation: Degrees of freedom = 5 + 2 + 2 + 2 + 1 = 12.