Steam Boilers, Engines, Nozzles and Turbines
Carbonization of coal is the process of

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

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Steam Boilers, Engines, Nozzles and Turbines
In natural circulation type boiler,

Water is converted into steam in one. Pass without any recirculation
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Feed pump is employed to supplement natural circulation in water wall type furnace

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To guide motion of the piston rod and to prevent it from bending
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
None of these
To transfer motion from the piston to the cross-head

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

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

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