Steam Boilers, Engines, Nozzles and Turbines
The three "Ts" for good combustion are

Total air, true fuel, and turbulence
Temperature, time, and turbulence
Thorough mixing, total air and temperature
Total air, time, and temperature

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

Enriching carbon in the coal
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
Pulverizing coal in inert atmosphere

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Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

To measure pressure of steam inside the steam boiler
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
To indicate the water level inside the boiler to an observer
None of these

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