Chemical Process Analysis Concept Inventory – Project 3
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Answer
Key
The purpose of this multiple-choice inventory is to help you assess your understanding of basic concepts in chemical
process analysis. Please do the following:
1.
You are to complete the “Project P3 Concept Inventory, Part A” survey in Team 360 by yourself,
using the questions below. Write your selected options (like A or C) for each question on some scrap paper.
2.
After all members in your team have completed this survey, your team is to meet, compare answers,
resolve any differences, and be ready to state “why” for each answer.
3.
Member Club is to complete the “Project P3 Concept Inventory, Part B” survey in Team 360 using
the consensus answers of your team.
4.
Your team is to consult with the instructor and address the “why’s” for your team’s answers.
∟ What principle did you use to figure out the answer?
Please return this paper copy of the concept inventory to the instructor before you leave class today.
Questions 11 and 12 refer to the diagram below. The flow rate of stream  is greater than the flow rate
of stream , and the composition of streams  and  are identical.
Q11. What are the directions of flow between points  and , and between points  and  ?
a)  to  and  to .
b)  to  and  to .
c)  to  and  to .
d)  to  and  to .
material balance
e) Insufficient information is supplied to answer the question.
Q12. Which one of the following statements is correct?
a) The composition of stream  is the same as stream .
b) Stream  is between 45 % and 80 % methanol.
c) The composition of stream  is the same as stream .
d) The flow rate of stream  is between 17 and 29 kg/min.
e) Stream  is between 45 % and 80 % methanol.
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lever rule material balance
Chemical Process Analysis Concept Inventory – Project 3
DO NOT WRITE ON THIS PAPER COPY!
Answer
Key
Q18. Consider the process shown below.
A stream consisting of three components, A, B and C, enters a separator. The composition of the
stream is 20 % A, 30 % B and 50 % C. The separator produces three streams of differing
compositions, and of differing flow rates. The composition of one of the streams leaving the
separator is 56 % A, 28 % B and 16 % C. The composition of another of the three streams is 58 %
A, 10 % B and 32 % C. Which of the compositions listed below is a possible composition of the
third product stream?
a)
2 % A, 35 % B and 63 % C.
reverse lever rule
b) 10 % A, 25 % B and 65 % C.
c) 22 % A, 25 % B and 53 % C.
d) 28 % A, 12 % B and 60 % C.
e) 30 % A, 45 % B and 25 % C.
Q19. Carbon monoxide at a temperature of 88ºC enters a pipe network at a flow rate of 32 kg/min. The
carbon monoxide flows 150 m along a length of pipe before being mixed with a stream of
hydrogen. The hydrogen entered the pipe network at a temperature of 65ºC with a flow rate of 4
kg/min a distance 80 m from the mixer. Within the pipe network the temperature and pressure of
the gases varies significantly. What is the flow rate of the mixed gas stream at a point 200 m from
the mixer?
a) Less than 36 kg/min.
b) 36 kg/min.
mass balance
c) Greater than 36 kg/min.
d) Impossible to say as it depends on the relative diameters of the pipes.
e) Impossible to say as it depends on the nature of the gas.
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Chemical Process Analysis Concept Inventory – Project 3
DO NOT WRITE ON THIS PAPER COPY!
Answer
Key
Q05. You use your breath to blow up an ordinary party balloon at home. Which of the pressures listed
below is closest to the absolute pressure inside the balloon?
a) 100 kPa.
absolute pressure and the magnitude of the pascal unit
b) 1000 kPa.
c) 10000 kPa.
d) 100000 kPa.
e) 1000000 kPa.
Q10. What is 100ºC expressed in ºF?
a) 38ºF.
b) 100ºF.
c) 180ºF.
d) 212ºF.
e) 180ºF or 212ºF.
180ΔºF
180 Fº
difference between temperature and delta temperature
Please return this paper copy of the concept inventory to the
instructor before you leave class today.
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