quiz_03_solution

quiz_03_solution - EML 5104 Classical Thermodynamics,...

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Unformatted text preview: EML 5104 Classical Thermodynamics, Spring 2010 Quiz 3, 29 Jan 2010 Name (Print): ___________________________________ UF ­ID: ___________________________________ Please sign the honor pledge: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." _________________________________ Signature Q1: Which expression is not a correct statement of the 2nd Law of TD for a cycle (1P) a) b) c) d) −Q2 Q1 ≥ ( −Q2 Q1 )rev N i =1 N i ∑Q ∑Q i =1 Ti + Wrev T0 ≤ 0 Ti ≤ 0 i Q2: Which of the following statements is correct? A Carnot Cycle consists of … (1P) a) two isothermal and two isentropic processes b) four reversible processes c) two isothermal and two adiabatic processes d) All of the above Q3: Draw a P V and a T S diagram. In both diagrams, sketch the processes that constitute a Carnot cycle. Explain each process (4P) See Bejan p 47, Fig. 2.2 Q4: Which of the following processes is also always isentropic (1P) a) polytropic process b) isothermal and reversible process c) adiabatic and reversible process d) none of the above. Q5: Mark the definition of thermodynamic temperature (1 P) a) T=T0 ( ­Q/Q0)irr b) T=T0 ( ­Q/W) c) T=T0 ( ­Q/Q0)rev d) T=T0 ( ­W/Q0)rev δ Q T ≤ 0 ∫ Turn page! EML 5104 Classical Thermodynamics, Spring 2010 Q6: Insert the missing term into this open system statement of the 2nd Law (2.5P) N Q dS 0 ≤ Sgen = − ∑ i + ∑ ms − ∑ ms + dt i = 1 Ti out in Q7: Draw a U ­V diagram and draw an adiabatic and reversible line. Indicate, which part of the U ­V space is accessible adiabatically from any point on the adiabatic and reversible line and which not. Draw one reversible and one irreversible process (3P). Q8: Sketch Joule’s calorimeter experiment, use the heat engine convention, indicate and explain work and heat transfer (3P) Q9: Give a mathematical expression for the differential change of entropy dS, explain each variable (2.5P) dS = Q10: In an isolated system (1P) a) Total energy decreases and entropy decreases b) Total energy increases and entropy increases c) Total energy is constant and entropy approaches a maximum d) None of the above Points: _______/ 20 P δ Qrev T Turn page! ...
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