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GATE ME 2022: Thermodynamics
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Question 1
The air in a room given dimensions are 3m ×4 m × 5 m at 90 kPa and temp. 24 °C. Determine the density of the gas if the constant of air is R = 0.287 kJ/kg-K.
Question 2
The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called __________.
Question 3
A piston-cylinder device initially contains 0.4 m3 of air (to be treated as an ideal gas) at 100 kPa and 80oC. The air is now isothermally and reversibly compressed to 0.1 m3. The work done during this process (in kJ) is
(Take the sign convention such that work done on the system is negative)
(Take the sign convention such that work done on the system is negative)
Question 4
Consider a 15 kW electric heating system over which air flows at a rate of 150 m3/min. If the entry temperature of air is 17 °C and 200 J/sec heat is lost before air enters the house after heating, then the temperature of air at the entry of house is ____ °C.
[Assume pressure to remain constant at 100 kPa]
[Assume pressure to remain constant at 100 kPa]
Question 5
According to second law of thermodynamics, the entropy change of the system for any process can be
Question 6
3kg of water at 80°C is mixed adiabatically with 5 kg of water at 24°C. Calculate the final temperature of the mixture and entropy generated during the mixing process. (in k and J/k)
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Jul 4ESE & GATE ME
