Which one of the following is not true about dissociation? 

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JKSSB JE Mechanical 02 Nov 2021 Shift 1 Official Paper
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  1. reverse process of combustion
  2. The fuel and air completely combine chemically at high temperatures
  3. disintegration of combustion products at high temperature
  4. heat absorption process

Answer (Detailed Solution Below)

Option 2 : The fuel and air completely combine chemically at high temperatures
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Explanation:
Factors considered for Fuel-air Cycle Calculations The following factors are taken into consideration while making fuel-air cycle calculations:

1. The actual composition of cylinder gases (consisting of fuel, air, water vapour in the air and residual gas). During the operation of the engine, the fuel-air ratio changes due to which the relative amounts of CO2 water vapour etc. also change. 

2. Increase of specific heats of gases (except monoatomic gases) with temperature increase, subsequently the value of γ also changes. 

3. Since the fuel-air mixture does not completely combine chemically at high temperatures (above 1600 K), therefore, at equilibrium conditions gases like CO2 H2 and O2 may be present.

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