Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

High calorific value coal being burnt
Fouling of heat transfer surfaces
Raising of steam temperature
Higher effectiveness of 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 first decreases from entrance to throat and then increases from its throat to exit
When the cross-section of the nozzle increases continuously from entrance to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
None of these

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