Mechanical engineering is one of the broadest engineering disciplines, Mechanical engineers can do research, design, develop, build, and test mechanical and thermal sensors and devices, including tools, engines, and machines.

As you asking here I am telling few jobs name which you can do after graduation in Mechanical engineering:

Aerospace industry – researches, designs, manufactures, operates and maintains aircraft

Automotive industry – designs, manufactures, distributes and markets motor vehicles

Chemical industry – covers oil companies, chemicals manufacturers and the businesses that support them (eg to build new plants or develop new process technologies)

Construction industry – designs and builds infrastructure, buildings and buildings services (eg heating and ventilation)

Defence industry – provides equipment, support and services for the armed forces and national security

Electronics industry – designs and manufactures components and complete equipment for sectors from automotive to medicine and the military

Fast moving consumer goods industry – manufactures products such as household cleaning items, personal hygiene goods and convenience foods

Marine industry – develops and helps operate vessels

Materials and metals industry – activities include developing new materials and manufacturing components or end products

Pharmaceuticals industry – develops and manufactures drugs

Rail industry – designs, constructs, manages and maintains rail system

components from trains and tracks to electrical power systems and train control systems

Utilities industry – helps supply power, water, waste management and telecoms.