Steam Boilers, Engines, Nozzles and Turbines
Besides mean effective pressure, the data required to determine the indicated power of an engine include

Piston diameter, specific fuel consumption and Calorific value of fuel
Specific fuel consumption, speed of rotation and torque
Piston diameter, length of stroke and calorific value of fuel
Piston diameter, length of stroke and speed of rotation

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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 determine the generating capacity of the boiler
To prepare heat balance sheet for the boiler

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