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

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
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
Water is converted into steam in one pass without any recirculation
Feed pump is employed to supplement natural circulation in water wall type furnace

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Steam Boilers, Engines, Nozzles and Turbines
Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that

former is fire tube type and latter is water tube type boiler
former contains one fire tube and latter contains two fire tubes
None of these
former is water tube type and latter is fire tube type

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

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

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