Answered: Air is compressed in a piston-cylinder…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Air is compressed in a piston-cylinder assembly. Initially, the pressure and temperature of the air are 150 kPa and 47 oC, and in the final state, the pressure is 900 kPa and the temperature is 207 oC.

During this process, the entropy change of the air;

a) using the property values in the weather table

b) calculate using average specific heats. (cp mean=1.0354 kJ/ kgK)

Rules • All units should be written in all question solutions,

• Unit conversions should be displayed,

• When determining the phase: it should be written which table was used, why that table was chosen, and how the phase was decided according to the values obtained from the tables.

• The reason for each acceptance made in the solution should be written.

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