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GATE 2020: Thermodynamics Quiz 6
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Question 1
Which one of the following represents the condensation of a mixture of saturated liquid and saturated vapour on the enthalpy-entropy diagram?
Question 2
A pure substance at 8 MPa and 400 °C is having a specific internal energy of 2864 kJ/kg and a specific volume of 0.03432 
/kg. Its specific enthalpy (in kJ/kg) is ______.
/kg. Its specific enthalpy (in kJ/kg) is ______.Question 3
When an ideal gas with constant specific heats is throttled adiabatically, with negligible changes in kinetic and potential energies
where h, T and s represent respectively, enthalpy, temperature and entropy.
Question 4
A certain mass of a pure substance undergoes an irreversible process from state 1 to state 2, the path of the process being a straight line on the T-s diagram. Calculate the work interaction. Some of the properties at the initial and final states are: T1 = 330 K, T2 = 440 K, U1 = 170 kJ, U2 = 190 kJ, H1 = 220 kJ, H2 = 247 kJ and S1 = 0.23 kJ/K and S2 = 0.3 kJ/K, where T, U, H and S represent temperature, internal energy, enthalpy and entropy respectively.
Question 5
A mono-atomic ideal gas (γ = 1.67, molecular weight = 40) is compressed adiabatically from 0.1 MPa, 300 K to 0.2 MPa . The universal gas constant is 8.314 kJ-kmol-1K-1. The work of compression of the gas (in kJ kg-1) is ___________.
Question 6
Which combination of the following statements is correct?
P: A gas cools upon expansion only when its Joule–Thomson co–efficient is positive in the temperature range of expansion.
Q: For a system undergoing a process, its entropy remains constant only when the process is reversible.
R: The work done by a closed system in an adiabatic process is a point function.
S: A liquid expands upon freezing when the slope of its fusion curve on Pressure. Temperature diagram is negative.
P: A gas cools upon expansion only when its Joule–Thomson co–efficient is positive in the temperature range of expansion.
Q: For a system undergoing a process, its entropy remains constant only when the process is reversible.
R: The work done by a closed system in an adiabatic process is a point function.
S: A liquid expands upon freezing when the slope of its fusion curve on Pressure. Temperature diagram is negative.
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