Steam Boilers, Engines, Nozzles and Turbines
Coke is produced by

Enriching carbon in the coal
Pulverizing coal in inert atmosphere
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Heating wood in a limited supply of air at temperatures below 300°C

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Steam Boilers, Engines, Nozzles and Turbines
The nozzle efficiency is the ratio of

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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