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Semester test 1 2016 memorandum
semester test 1 MTX311 2016 worked out solutions. The memorandum has solutions are 100% correct including alternative working methods. The solutions are done in a step by step matter
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Thermodynamics MTX 311Exam: June 2014
Examiner
Dr AS Lexmond (University of Pretoria)
Instructions
1 Time: 120 min.
2 Answer all the questions
3 Full marks: 100
4 Neatness saves you points, especially when only part of the question is correct.
5 Give the equations before you start filling in numbers; for the questions marked with an
*, also give a short but clear solution strategy
6 You are allowed to take fundamentals of thermodynamics (7th or 8th edition), non-ideal
gas hand-out, one page, A4, with your own notes (both sides) and all the material from
the click-up page “lectures”
7 For all questions: use a reference temperature and pressure of T0=25°C, P0=1 bar
Fig. 1 PFD of question 1A and 1B
1 We want to produce 0.35 kg/s of a 1:3 mixture (on weight basis) of steam and benzene at 400°C,
1bar. We produce this mixture by reducing the pressure of process streams of steam and benzene,
both at 400°C, 100 bar and mixing these process flows. (see fig. 1). Average Cp of benzene (25-
400°C): 2.1 kJ/kgK If you fail to calculate the gas constant of benzene, use the value of R=0.1 kJ/kgK
1A * Do we have to add or remove heat in this process (or is the process adiabatic?) If heat has to
added or removed, how much heat has to be added/removed per kg mixture?
1B * What is the volumetric flowrate (in m³/s) of the mixture?
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