They can also design HVAC equipment. These people can also work in research & development related to machines or equipment. Operations & supply chain is also a profitable field for Mechanical Engineers. To be straight, there is a lot of competition & chasing in the field, but this chasing can give fruitful results in the later stages.
Nowadays, Mechanical Engineers are also working in Telecommunication & Networking field, Computer Science field, Electronics & Electrical Engineering fields. Being a Mechanical Engineer, it is extremely necessary to have a vast knowledge for different engineering fields. After completion of Mechanical Engineering, one can opt for M.Tech or MS in Mechanical Engineering from a reputed college. MBA in supply chain management or operations management is also a very good option that helps students to grow in logistics & offshore engineering fields.