Phone interview with 2 intern wranglers. They ask about mechanical aptitude, education, and personality traits. It was low pressure, how ever they do ask a few technical questions just to see how you think. Getting the right answer isn't the most important, your thinking process is. "What kind of things outside of school do you participate in that demonstrate your interests in mechanical engineering" is a very common question.

First I had to fill out a questionnaire with questions about be experience. Then they scheduled a Skype interview which turned out to be a phone interview, apparently because of miscommunication with HR. This was the last stage.