Steam Boilers, Engines, Nozzles and Turbines
The function of a flywheel is

To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To prevent fluctuation of speed
To keep the engine speed uniform at all load conditions
To convert reciprocating motion of the piston into rotary motion

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

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

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

When the cross-section of the nozzle decreases 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
When the cross-section of the nozzle increases continuously from entrance to exit

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