Basic concepts of Thermal Engineering | Gate Mechanical Notes

1. The pressure of the gas in terms of its mean kinetic energy per unit volume E is equal to 2E/3 and Kinetic Energy is always proportional to temperature.
2. The super heated vapor acts as perfect gas and obeys all gas laws
3. Absolute zero pressure will occur when there is no molecular momentum
4. No liquid can exists at absolute zero pressure and absolute pressure can be attained at 0 Kelvin
5. Behavior of gas can be fully determined by four gas laws
6. For air ratio of specific heats is 1.4
7.  Mono-atomic gas has highest ratio of specific heat = 1.66As per Joule’s law internal energy is function of temperature.
8. The same volume of all gases would represents their molecular weights
9. Gases have two value of specific heat. One is at constant pressure and one is at constant volume
10. The molecular weights of all the perfect gases occupy the same
11. volume under same conditions of pressure and temperature.
12. Work done in free expansion process is always zero
13. Work done for rigid container having gas, is zero
14. Heat and work are not properties of system
15. Absolute value of internal energy cannot be found but only change in internal energy can be found
16. On weight basis air contains 23 parts of oxygen
17.   Heat and work are path functions
18.   N.T.P means Normal Temperature Pressure
19. Change in the enthalpy is the heat supplied during constant pressure
20. Change in the internal energy is the heat supplied during constant volume
21. For isothermal process, process index is unity
22. The basis for measuring thermodynamic property of temperature is given by zeroth law of thermodynamics
23. First law of thermodynamic gives concepts of internal energy
24. Second law of thermodynamic gives concepts of entropy
25. Third law of thermodynamic deals with concept of zero entropy at absolute zero temperature of 0 Kelvin.
26. Throttling is the process during which cooling is produced
27.  1 calorie = 4.186 Joule
28.  Integration of pdv is non flow work
29. On volume basis air contains 21 parts of oxygen
30. Molecular weight of gas x characteristics gas constant = value of universal gas constant
31. For a perfect gas, internal energy and enthalpy are functions of temperature only.

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