1.Air undergoes an isochoric process from 309 K to 747 K. What is the change in entropy in J/kg-K? Given: R=287 J/kg-K,

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1.Air undergoes an isochoric process from 309 K to 747 K. Whatis the change in entropy in J/kg-K? Given: R=287 J/kg-K, cv=714J/kg-K, cp=1001 J/kg-K.
2. Changes in entropy are the result of (check all thatapply):
A.Heat transfer
b.Work
c.Irrerversibilities
d.Reversibilities
e.Isentropic processes
3. A system undergoes an irreversible heat additionprocess. Is the change in entropy:
A.Greater than zero
B .Less than zero