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

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

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Steam Boilers, Engines, Nozzles and Turbines
A regenerative steam cycle renders

Decreased work output per unit mass of steam
Decreased work output per unit mass of steam as well as increased thermal efficiency
Increased work output per unit mass of steam
Increased thermal efficiency

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

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

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