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

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

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Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Supplied mounted on a single base
Packaged boiler does not exist
Purchased from several parties and packed together at site
Supplied by same manufacturer loose and assembled at site

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

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

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