My professor gave out a quick review for our midterm, and I want to make sure I\
ID: 1819141 • Letter: M
Question
My professor gave out a quick review for our midterm, and I want to make sure I've got the basic theory downAre the following statements true/false? why?
a) a process that violates the first law of thermodynamics also violates the second law of thermodynamics
b) entropy cannot cross the boundary of a control volume
c) specific entropy, s, is an extensive property
d) for n=1 the polytropic process is an adiabatic process
e) is there an entropy change during a Carnot cycle?
f) Entropy can be generated but cannot be destroyed in a thermodynamics process
g) It is possible for the entropy of an isolated system to decrease during a process
Explanation / Answer
a) a process that violates the first law of thermodynamics also violates the second law of thermodynamics - True; Because if energy is not conserved then entropy can't be adjudged.
b) entropy cannot cross the boundary of a control volume - True; Entropy is only valid for a particular control Volume whether it is surrounding or external.
c) specific entropy, s, is an extensive property - True; It is an extensive property, i.e. it depends upon the mass of the system. Specific entropy is the entropy per unit mass.
d) for n=1 the polytropic process is an adiabatic process - False; For n = 1 the temperature is constant; not necessarily dQ = 0
e) is there an entropy change during a Carnot cycle - Yes; Carnot cycle means process of constant temperature from A - B and constant entropy B-C. So for A-B there is entropy change.
f) Entropy can be generated but cannot be destroyed in a thermodynamics process - False; It can be destroyed too.
g) It is possible for the entropy of an isolated system to decrease during a process - Yes; Entropy Decreases in Isolated Systems with anInternal Wall undergoing Brownian Motion
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