Choosing an engineering stream to study should not be based on what will be most lucrative, but which one will use your interests and aptitude the best. So go for combinations that will hold your interest in the long run than the immediate placement after the four-year course.
Engineering is a scientific field and job that involves taking our scientific understanding of the natural world and using it to invent, design, and build things to solve problems and achieve practical goals. This can include the development of roads, bridges, cars, planes, machines, tools, processes, and computers.
Industrial engineering is studying and developing methods to optimally utilize available resources using mathematical and engineering tools. Industrial engineering has deep tie-ins with sectors varying from manufacturing and healthcare systems to business administration.
Nuclear engineering works with the applications of the breakdown or combination of atomic nuclei or other sub-atomic processes. Today, nuclear engineering finds applications in medicine and radiation sciences, apart from the usual manning processes at a nuclear reactor or power plant.
Chemical engineering deals with the development of process and design to efficiently utilize energy and chemicals. Chemical engineers make valuable contribution in manufacturing, pharmaceuticals, healthcare, petrochemical and food industry.
Students interested in defence and space can always look at aerospace engineering which specializes in aerodynamic fluid flow, structural design and other vital aspects of aerospace engineering.