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

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

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

None of these
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

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