what is defination of engine?

Answer 1

An "engine" is usually an internal combustion engine, like a gasoline or diesel engine. It has pistons that reciprocate in cylinders due to the combustion process occurring in the cylinders. The reciprocating pistons turn a crankshaft. Since this question is posted in the Boats & Boating section, one would assume that the engine you are asking about will be used to turn a propeller. The propeller may be connected directly to the shaft of the engine or may be turned through a set of gears. In other applications the shaft may be connected to a motor, and used to turn the motor to generate electricity.

There are also steam engines. The old steam engines were also reciprocating types, but the combustion took place in a seperate piece of machinery - the boiler - where water was heated to steam and used to drive the steam engine. Most modern steam plants now use turbines.

The difference between an engine and a motor is that the engine is (pretty much) self powered - containing its own fuel, while a motor is turned by an outside source.
In everyday non-technical usage "motor" and "engine" are nearly interchangeable.

Dictionary.com defines a motor as "a comparatively small and powerful engine, esp. an internal-combustion engine in an automobile, motorboat, or the like."

Answer 2

The definition of an engine is a machine that changes chemical energy in fuel to mechanical energy. The exploding fuel pushes down the piston in the cylinder and that energy is transferred to the wheels through the camshaft.

Answer 3

According to the navigation rules of the road any vessel that is propelled by mechanical means in power drive. Taking that engine is any mechanical device that propels a vessel in the water.

Answer 4

well internal combustion engine?? thats like a crankshaft driven by pistons powered by the combustion of something