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jet fuelWrong, sorry, many small helicopters have piston engines and run on gasoline.
Yes, biofuel, like biodiesel, will run in diesel engines. Many ships have diesel engines run on fossil fuel diesel and they will easily run on biofuel.
Most small engines are designed to run on regular unleaded gasoline; the higher octane premium gasoline may eventually be harmful to the engine.
yes they are, they are the engines you see on a 747 or even a small Private jet
In very small amounts, yes. In large amounts the engine won't start or run.
Yes. Bigger engines waste more fuel because it take more fuel to make them run.
steam is used on things such as railway engines and standby generators.
There are electric bikes(which usually legally are considered bicycles) and there are bikes with combustion engines.(which usually are seen as either scooters/mopeds or motorcycles by the law.) For the combustion engines you can have either 2-stroke engines(which usually are fairly small) or 4-stroke engines. You can have one cylinder, or several. Then there are a few custom builds with turbine engines and the occasional drag/showbike with jet, or rocket engines. Most bikes run on gasoline, but there are Diesel bikes too.
OHV engines run with the camshaft built into the cylinder block, unlike SV engines (no longer used) where they run parallel to the cylinder block. More commonly used in the modern world are OHC (overhead camshaft) engines, which run in a similar manner to OHV engines, eliminate the need for pushrods. The function however? Is the same as any other engine; to spin an axle with high RPM/Torque depending on application.
No, gasoline engines require a volatile fuel mixture to run ; water is inert, so it does not burn.
Most small vehicles do not use diesel engines.