I applied to several positions in Caterpillar through online and talked to them during college career fair. I haven't heard anything from that after that, but I talked with the employee at an event held by one RSO in my campus. A week or two later they contact me, and invited me to an interview. Overall process were clear and nice.

First round of interview conducted in online mode. For electronic background students, questions were asked in electronics, electricals, instrumentation, c and cpp programming in technical and aptitude questions(quants,reasoning,verbal and non verbal).