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

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

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To discharge the gases of combustion to the atmosphere through the chimney
All of the listed here
To provide an adequate supply of air for the fuel combustion
To exhaust the gases of combustion from the combustion chamber

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