# Thermoexam2018

NAZARBAYEV UNIVERSITYSchool of EngineeringExamination for Internal StudentsAcademic Session 2017/18ENGINEERING THERMODYNAMICSDate: 25th April, 2018Time: 09:00 amTime Allowed – 3 hoursAttempt FIVE questions from sixAll questions carry 20 marks, you can obtain a maximum of 100marks in this examination.The use of calculators approved by the School of Engineering ispermitted. Approved thermodynamic tables, charts and keyequations are provided.DO NOT WRITE ON THIS EXAMINATION QUESTIONPAPER. THIS PAPER WILL BE COLLECTED AFTER THEEXAMINATION HAS ENDED.ENG. THERMODYNAMICS, Semester 2, 2017/20181. (a) State the Kelvin-Plank statement of the Second Law of Thermodynamics.Illustrate the statement with a simple diagram.( 3 marks)(b) Illustrate with a simple diagram a system undergoing a power cycle while communicating thermally with two thermal reservoirs, one hot, one cold. Definethe thermal efficiency.( 3 marks)(c) During December, at a location in Kazakhstan winds at -30o C can be observed.Several meters below ground the temperature remains at 13o C, however. Aninventer claims to have devised a power cycle exploiting this situation that hasa thermal efficiency of 14%. Evaluate this claim.( 6 marks)(d) A refrigeration cycle operating between two reservoirs receives energy QC froma cold reservoir at TC = 280 K and rejects energy QH to a hot reservoir atTH = 320 K. For each of the following cases determine whether the cycleoperates reversibly, oper … Purchase document to see full attachment

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