Engineering Thermodynamics
According to First law of thermodynamics,

Work-done by a system is equal to the heat transferred by the system
Total internal energy of a system during a process remains constant
Total energy of a system remains constant
Internal energy, enthalpy and entropy during a process remain constant

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Engineering Thermodynamics
Producer gas is obtained by

Carbonization of bituminous coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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Engineering Thermodynamics
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

Full distillation
Carbonisation
Fractional distillation
Cracking

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