Page 96 - DJJ20063- Thermodynamics 1
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DJJ20063- Thermodynamics 1
Activity 3A
TEST YOUR UNDERSTANDING BEFORE YOU CONTINUE WITH THE NEXT INPUT…!
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3.1 In the cylinder of a large engine, 1.0 kg of carbon dioxide at 527 C and 20 bar
expands isothermally to a pressure of 1.4 bar. What is the final volume of the gas?
Take R = 189 Nm/kgK for carbon dioxide.
3.2 1 kg of nitrogen (molecular weight 28) is compressed reversibly and isothermally
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from 1.01 bar, 20 C to 4.2 bar. Calculate the work done and the heat flow during
the process. Assume nitrogen to be a perfect gas.
3.3 Air at 1.02 bar, 22 C, initially occupying a cylinder volume of 0.015 m , is
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compressed reversibly and adiabatically by a piston to a pressure of 6.8 bar.
Calculate the final temperature, the final volume, and the work done on the mass
of air in the cylinder.
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