Steam Boilers, Engines, Nozzles and Turbines
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

Forced draught
Balanced draught
Natural draught
Induced draught

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Water passes through the tubes which are surrounded by flames and hot gases
None of these
Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water

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