As you asked here I am telling Mechanical engineering deals with the design, development, installation, operation and maintenance of anything that has moving parts. After graduation in Mechanical engineering you will find relevant opportunities in a range of sectors, including:

Aerospace engineer
Automotive engineer
Contracting civil engineer
Control and instrumentation engineer
Maintenance engineer
Mechanical engineer

Jobs where your degree would be useful include:
Automobile and auto part manufacturers
Aerospace industry
Various Government sector undertakings
Aviation companies
Steel plants
Thermal plants and gas turbine manufacturers
Air conditioning and refrigeration industry
Shipping industry
Engineering consultancies
Armed forces
Corporate investment banker
Mining engineer
Patent attorney
Production manager
Technical sales engineer
Water engineer