Chemical Engineering

Solving Material and Energy Balances Using Process Simulators

Question 1
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What are the number of degrees of freedom if the number of variables and number of equations are 10 and 8 respectively?
2
8
10
18
Explanation:
Number of degrees of freedom = 10 – 8 = 2.
Question 2
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What are the number of degrees of freedom if the number of variables and number of equations are 15 and 10 respectively?
5
10
15
25
Explanation:
Number of degrees of freedom = 15 – 10 = 5.
Question 3
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Which of the following cannot be treated as a variable for degrees of freedom calculation?
Temperature
Pressure
Volume
Work
Explanation:
Since Volume is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.
Question 4
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What are the number of variables associated with a process stream, if the number of species in the stream are 2?
1
2
3
4
Explanation:
Nv = Nsp + 2 = 2 + 2 = 4.
Question 5
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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?
7
9
11
15
Explanation:
Number of degrees of freedom = 18 – 7 = 11.
Question 6
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What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?
5
10
15
20
Explanation:
Number of degrees of freedom = 15 – 5 = 10.
Question 7
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What are the number of degrees of freedom if the number of variables and number of equations are 21 and 9 respectively?
7
9
10
12
Explanation:
Number of degrees of freedom = 21 – 9 = 12.
Question 8
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Degrees of freedom calculation treat which kind of variables?
Intensive
Extensive
Both
None of the mentioned
Explanation:
Degrees of freedom calculation treat intensive variables.
Question 9
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Which of the following cannot be treated as a variable for degrees of freedom calculation?
Specific enthalpies
Heat
Extent of reaction
Entropy
Explanation:
Since entropy is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.
Question 10
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What are the number of compositions associated with a process stream, if the number of species in the stream are 2?
1
2
3
4
Explanation:
Number of compositions = Nsp – 1 = 2 – 1 = 1.