While mechanical engineers are always in demand. It is surprising that mechanical engineering scope transcends the borders and is helpful in other branches too. The scope of mechanical engineers is explained below industry-wise. Aerospace sector - Mechanical engineers are required to design, operate and maintain aircraft Electronics sector - They are required to design and manufacture components Marine sector - to build and maintain the vessels. For the same reason, mechanical engineers are in demand in the defense sector too The other sectors are chemical, construction, railway, and automotive.