Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of brake power to the indicated power
Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

To measure pressure of steam inside the steam boiler
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
None of these
To indicate the water level inside the boiler to an observer

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Steam Boilers, Engines, Nozzles and Turbines
The ultimate analysis of fuel lists

Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

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