- POGONSKE mašine pretvaraju neku energiju (npr. kinetička energija vode, toplotna energija vodene pare ili gasa, električna i si.) u mehaničku energiju neophodnu za izvršenje korisnog rada.
- RADNE mašine izvršavaju neku korisnu funkciju i tako čovjeku olakšavaju rad (dizalice, pumpe, miješalice, strugovi, bušilice, transportne mašine, rudarske mašine...)
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- Power machines used for conversion of any kind of energy into mechanical energy are called engines. They include electric motors, turbines, and internal-combustion, piston, and steam engines. Electric generators are also a widely used type of power machine.
- Operating machines are subdivided into technological and transportation machines. In technological machines the “material” is the object on which operations are performed (the workpiece, which may be solid, liquid, or gaseous). The processing of material in these machines is a change in shape, properties, state, and position. In transportation machines the “material” is the object being moved; its “conversion” consists only of a change in position. Technological machines include metal working machines, rolling mills, looms, packing machines, typesetting machines, and printing presses. Transportation machines include motor vehicles, diesel locomotives, airplanes, helicopters, elevators, and conveyors.
http://encyclopedia2.thefreedictionary.com/Machine