the broadest engineering discipline is mechanical engineering.. kahit saan pwede:
1. construction:
-piping system (fire sprinkler)
-plumbing
-centralized aircon system
2. manufacturing:
-machines for fabrications
-Car manufacturing
-engines
3. petroleum,oil and gas industries
-piping system
4. HVAC(heating,ventilating & airconditioning)
5. Refrigeration
6. power plant operation
7. automotives
etc...
http://en.wikipedia.org/wiki/Mechanical_engineering
Mechanical engineering
overlaps with aerospace engineering, civil engineering, electrical engineering, petroleum engineering, and chemical engineering to varying amounts.
http://www.dlsu.edu.ph/academics/colleges/coe/me/default.asp
Mechanical engineers touch almost every aspect of technology.
http://www.njit.edu/features/faculty/kountouras.php
Q: Can you describe mechanical engineering?
A:
Mechanical engineering is by far the most broad-based branch of engineering
Q: What are the main industries in which mechanical engineers work?
A :
Mechanical engineers work in the widest range of industries, more so than any other kind of engineer. They work in the aircraft and aerospace industries, the automotive industry, as well as in the fields of marine systems, heating ventilation and air conditioning, robotics, biomechanics, power generation and general manufacturing. New emerging industries such as nanotechnology and particle technology are major employers of mechanical engineers.
http://www.me.vt.edu/
Of the many engineering disciplines, mechanical engineering is the broadest, encompassing a wide variety of engineering fields and many specialties. Although it is commonly assumed that mechanical engineers are automotive engineers, in fact, mechanical engineers are employed in an enormous range of technical areas including: acoustics, air-conditioning, automatic controls, computer-aided design, energy management, fluid dynamics, tribology, robotics, biomechanics, and turbomachinery, just to name a few.
http://www.kettering.edu/me/
Mechanical Engineering is the broadest and most diverse of the engineering disciplines. Since the days of the Industrial Revolution, the Mechanical branch has been at the center of the engineering profession . . . and its important role shows no signs of diminishing.
i'm a licensed mechanical engineer for 7yrs now working in the construction industry(piping system)