Steam Boilers, Engines, Nozzles and Turbines
The heat loss in a boiler takes place in the form of

All of these
Moisture present in fuel and steam formed by combustion of hydrogen in fuel
Heat carried away by flue gases
Heat carried away by ash

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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

The expansion (or compression) of the steam is hyperbolic
There is no pressure drop due to condensation
All of these
Steam is admitted at boiler pressure and exhausted at condenser pressure

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

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

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