You would have to work under the supervision of an engineer. However, the officer at the Consulate requested that my previous sponsor authorize me to change my status to that of F-1 student. It seems strange as I have nothing to do with my old sponsor, and my new sponsor is willing to authorize anything. I was given a form allowing me to reenter the consulate at any time and not pay a fee. A consulate has the authority to ask any questions they deem relevant.
Some consulates are more difficult to deal with than others.
My current status is L-1A and I am seeking a green card. I work in California but my company's head office is in Michigan. My I-140 was applied for in the Nebraska Service Center in October 1999. When I called up customer service last week, I was informed that my file has been transferred to California Service Center on June 23, 2000. No reason was specified.