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Chemical Engineering Thermodynamics - Engineering

Q1:

In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.

A adiabatic

B reversible

C isothermal

D none of these

ANS:C - isothermal

In a polytropic process described by the equation 𝑃𝑉𝑛=constantPVn=constant, if 𝑛=1n=1, it means a/an isothermal process. For a polytropic process, the value of 𝑛n determines the type of process:

  • If 𝑛=1n=1, the process is an isothermal process. In an isothermal process, the temperature of the system remains constant, which means that the product 𝑃𝑉PV remains constant.
  • If 𝑛>1n>1, the process is adiabatic and involves compression or expansion of a gas without heat exchange with the surroundings.
  • If 𝑛<1n<1, the process is isentropic, indicating an expansion or compression process where the entropy remains constant.
Since 𝑛=1n=1 represents the condition for an isothermal process, the correct answer is isothermal.