Hi Sribash,
Mechanical engineering is a professional programme which helps students to understand the working mechanisms of heavy tools and machineries. The course covers technical areas like distribution of electricity through generators, transformers, transmission lines, lighting and wiring in buildings.
Automotive Engineering is a sub-branch of vehicle engineering. It can also be considered as a sub-branch of mechanical engineering that has split from the main branch focusing on the automotive field of study.
Automobile engineering focuses on the cars. It specifically deals with the designing of cars, operations in production of cars, designing of engines and fuel management. Thus, automobile engineering can be considered as a sub branch of automotive engineering.
There are various job opportunities in all three stream, because all are interconnected with ecah other.
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