VERY IMPORTANT INTERVIEW QUESTION:- Q:-Difference between internal combustion engines and external combustion engines?

VERY IMPORTANT INTERVIEW QUESTION:-

Q:-Difference between internal combustion engines and external combustion engines? 

Answer:- In an *Internal Combustion Engine*, the Fuel is burnt in the cylinder or vessel eg. Diesel or Petrol engine used in Cars.
In an *External Combustion Engine*, the internal working fuel is not burnt. Here the fluid is being heated from an external source. The fuel is heated and expanded through the internal mechanism of the engine resulting in work. eg. Steam Turbine, Steam engine Trains.
* Internal engine has its energy ignited in the cylinder. like 99.9% of engines today.
* An external combustion example is a steam engine where the heating process is done in an boiler out side the engine.

So in fact we can define internal combustion engine develops its operating pressure by burning fuel directly in the engine. Gasoline engines, Wankel engines, diesels, gas turbines are all internal combustion. External combustion engines burn the fuel outside the engine and use it to heat an operating fluid which then is used to operate the engine. Steam locomotives, steam turbines, and Stirling engines are external combustion