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Monday, 2 April 2012

Important concepts in Thermal Engineering for GATE Mechanical (Part-2)

The present post (Part-2) contains the important basic concepts in Thermal Engineering in Mechanical Engineering. Note down each concepts which might help in GATE 2013 Mechanical.
  • N.T.P means Normal Temperature Pressure
  • Change in the enthalpy is the heat supplied during constant pressure
  • Change in the internal energy is the heat supplied during constant volume
  • For isothermal process, process index is unity
  • The basis for measuring thermodynamic property of temperature is given by zeroth law of thermodynamics
  • First law of thermodynamic gives concepts of internal energy
  • Second law of thermodynamic gives concepts of entropy
  • Third law of thermodynamic deals with concept of zero entropy at absolute zero temperature of 0 Kelvin.
  • Throttling is the process during which cooling is produced
  • 1 calorie = 4.186 Joule
  • Integration of pdv is non flow work
  • On volume basis air contains 21 parts of oxygen
  • Molecular weight of gas x characteristics gas constant = value of universal gas constant
  • For a perfect gas, internal energy and enthalpy are functions of temperature only

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