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

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

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Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a divergent nozzle

None of these
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle increases continuously from entrance to exit

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