Steam Boilers, Engines, Nozzles and Turbines
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

Two times the height of chimney
One-half the height of chimney
Equal to the height of chimney
Four times the height of chimney

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Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

By direct mixing
From a metal wall from one medium to another
Heat is transferred by bleeding some gas from furnace
From heating an intermediate material and then heating the air from this material

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

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

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