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

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

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Steam Boilers, Engines, Nozzles and Turbines
Locomotive boiler is a

Single tube, vertical, externally fired and stationary boiler
Single tube, horizontal, internally fired and stationary boiler
Multi-tubular, horizontal, externally fired and stationary boiler
Multi-tubular, horizontal, internally fired and mobile boiler

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

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