Steam Boilers, Engines, Nozzles and Turbines
The aim of a compound steam engine is

To reduce the temperature range in each cylinder
To reduce the length of stroke
To reduce the ratio of expansion in each cylinder
All of these

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Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Fuel burns with less air
All the fuel burns instantaneously producing high energy release
Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Explosion in furnace

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

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

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