Engineering Thermodynamics
Coke is produced

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

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Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

All of these
It provides concept of maximising work output between the two temperature limits
All the heat engines are based on Carnot cycle
It is used as the alternate standard of comparison of all heat engines

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