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Thermodynamics ...

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  • Question 1
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    Which among the following is correct about irreversibility?

  • Question 2
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    The change in entropy for a polytropic process pvn is given by:

  • Question 3
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    In a reversible setup an engine takes heat from the source of 1000 K and 500 K amounting 50 kW and 30 kW respectively and it rejects 40 kW of heat to temperature T, The value of T is _______

  • Question 4
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    Available energy of a system is a function of

  • Question 5
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    In an adiabatic chamber, two blocks of the same mass and heat capacity comes in contact with each other. One is at a temperature of 500 K and the other one is at 1000 K. Find the value of entropy change if the system attains thermodynamic equilibrium. Take (mass = 2 kg, Cp = 1 kJ/kgK)

  • Question 6
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    Air is allowed to flow through a control volume such that its temperature changes from 500 K to 400 K and pressure varies from 5 atm to 1 atm Assuming entry and exit velocity as 10 m/s and 5 m/s. The change in available energy is_______ kJ/kg if the surrounding temperature is 27°C.

  • Question 7
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    Air with the flow rate of 1 kg/s is allowed to pass through a screw compressor with the inlet temperature as 300 K and an actual outlet temperature of 500 K with a pressure ratio = 4. Considering inlet velocity as 20 m/s and outlet velocity as 30 m/s and assuming no heat interaction with the surrounding, the value of irreversibility will be ______ kW

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