Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

Ratio of the heat liberated in the furnace to the heat actually used in producing steam
None of these
Ratio of the mass of steam produced to the mass of total water supplied in a given time
Ratio of heat actually used in producing steam to the heat liberated in the furnace

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work
To exhaust steam from the cylinder at proper moment

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