Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

All of these
When heat is being absorbed, temperature of hot source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered
When beat is being rejected, temperature of cold source and working substance should be same

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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

Carbonisation
Cracking
Fractional distillation
Full distillation

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Engineering Thermodynamics
Coke is produced

From the finely ground coal by moulding under pressure with or without a binding material
When coal is first dried and then crushed to a fine powder by pulverizing machine
By heating wood with a limited supply of air to a temperature not less than 280°C
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

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