Steam Boilers, Engines, Nozzles and Turbines
In fire 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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Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal power developed in each cylinder for uniform turning moment
Equal temperature drop in each cylinder for economy of steam
All of these
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

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