Production engineering is a combination of manufacturing technology with management science. A production engineer typically has a wide knowledge of engineering practices and is aware of the management challenges related to production. The goal is to accomplish the production process in the smoothest, most-judicious and most-economic way.
Automotive engineering, along with aerospace engineering and marine engineering, is a branch of vehicle engineering, incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the design, manufacture and operation of motorcycles, automobiles, buses and trucks and their respective engineering sub systems.
More generally, air conditioning can refer to any form of technological cooling, heating, ventilation. Air-conditioning engineers broadly divide air-conditioning applications into what they call comfort and process applications.
Marine engineering or ocean engineering broadly refers to the engineering of boats, ships, oil rigs and any other marine vessel or structure. Specifically, marine engineering is the discipline of applying engineering sciences, mostly mechanical and electrical engineering, to the development, design, operation and maintenance of watercraft propulsion and on-board systems submarines etc.