The specific internal energy of a compressed liquid at any pressure and temperat

Question

The specific internal energy of a compressed liquid at any pressure and temperature can be approximated by specific internal energy of saturated liquid at the same temperature Select one True False Specific enthalpy (h) of a compressed liquid at a given temperature and pressure can be approximated by the specific enthalpy of saturated liquid (h) at the same temperature Select one True False A fluid in a rigid container is heated from state 1 to state 2 with a isochoric process. The heat transfer to the system is: Select one: CP(V2-Vi) A fluid in a piston-cylinder closed system expands from state 1 to state 2 with a quasi-equilibrium isobaric process. The heat transfer to the system is: Select one: O a. H2-H1 O c. U2- U d.P(V2-V)

Explanation / Answer

1.True , because compressed liquid at liquid state.

2. True ,same as first question.

3.a) U2-U1 , Q=(U2-U1)+W, W= P(v2-v1) , in isochoric process v2=v1 => W=0 so Q = U2-U1

4.a) H2-H1 , H= U+PV

5.d) work done by the system , Q=(U2-U1)+W, in isothermal process U2=U1

6.d) None of the above , W = (P2V2-P1V1)/(1-n)

7 d) 0.5(p2+p1).(V2-V1) , Pavg.(V2-V1)

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