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

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
None of these
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied
And its corresponding conversion into dry steam at desired boiler pressure
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
Conversion into steam at atmospheric condition

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To determine the thermal efficiency of the boiler when working at a definite pressure
All of these
To prepare heat balance sheet for the boiler
To determine the generating capacity of the boiler

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