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GATE ME 2022: Thermodynamics
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Question 1
A system expands from state ‘1’ (P1, V1, T1) to the state ‘2’ (P2, V2, T2) in a reversible non-flow process as defined below
A- A constant-pressure process followed by a constant-volume process
B- A constant-volume process followed by a constant-pressure process
Work done ratio of the above two processes is _________, if
A- A constant-pressure process followed by a constant-volume process
B- A constant-volume process followed by a constant-pressure process
Work done ratio of the above two processes is _________, if
Question 2
For a liquid, at a temperature of 8 0C the vapor pressure is 2.7 kPa. Its enthalpy of vaporization is constant and equals 42700 kJ/kmol. At a vapor pressure of 13.5 kPa, the temperature of the vapor (in 0C) will be____.
Take gas constant R=8.314 kJ/kmol-K
Question 3
A rigid container has air initially at 1.5 bar, 27
brought to a final temperature of 127
by heat transfer from a thermal reservoir at 227
. The irreversibility (in kJ/kg) is ______. (atmospheric temperature = 27
, atmospheric pressure = 1 bar, cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK)
brought to a final temperature of 127 by heat transfer from a thermal reservoir at 227. The irreversibility (in kJ/kg) is ______. (atmospheric temperature = 27, atmospheric pressure = 1 bar, cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK)Question 4
What is the maximum work that can be obtained, if one kg of water at 90 °C is cooled to ambient temperature of 27 °C (Specific heat of water = 4.18 kJ/kg-K).
Question 5
Outside atmospheric air at 35oC is cooled by an air-conditioner upto 15oC with a mass flow rate of 1 kg/s. what will be the amount of power needed to operate this air-conditioner(Assume air-conditioner to be a reversible refrigerator)?
Question 6
A lump of steel of mass 50 kg is at a temperature of 2270C. What will be the maximum possible work (in kJ) that can be obtained from it, when the ambient temperature is 270C? Given specific heat of steel =0.5 kJ/kgK.
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