Which of the following ideal gas processes has the highest polytropic index? 

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  1. Isentropic process 
  2. Isochoric process 
  3. Isothermal process 
  4. Isobaric process 

Answer (Detailed Solution Below)

Option 2 : Isochoric process 
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Detailed Solution

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Explanation:

Polytropic Process is represented by:

PVn = C

where P is pressure, V is volume, and n is the polytropic index.

Equation value of n  Type of process Type of curve
P = C n = 0

Constant Pressure Process

(Isobaric Process)

Straight horizontal line
PV = C n = 1 Constant Temperature Process (Isothermal process) Rectangular Hyperbolic Curve
PVγ = C n = γ Adiabatic Process Polynomial Curve
PV = C n = ∞

Constant Volume Process

(Isochoric process)

Straight vertical line.

 

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