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

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

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Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Any one of the above
Actual mean effective pressure to the theoretical mean effective pressure
Area of the actual indicator diagram to the area of theoretical indicator diagram
Actual workdone per stroke to the theoretical workdone per stroke

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Water passes through the tubes which are surrounded by flames and hot gases
Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water
None of these

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