Steam Boilers, Engines, Nozzles and Turbines
The aim of a compound steam engine is

To reduce the temperature range in each cylinder
To reduce the length of stroke
To reduce the ratio of expansion in each cylinder
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To exhaust the gases of combustion from the combustion chamber
To discharge the gases of combustion to the atmosphere through the chimney
All of the listed here
To provide an adequate supply of air for the fuel combustion

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

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

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