Internal Combustion Engines
The two reference fuels used for cetane rating are

Cetane and normal heptane
Cetane and tetra ethyl lead
Cetane and iso-octane
Cetane and alpha-methyl naphthalene

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Internal Combustion Engines
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Increase maximum pressure and decrease maximum temperature
Decrease maximum pressure and increase maximum temperature
Increase maximum pressure and maximum temperature
Reduce maximum pressure and maximum temperature

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