60 mins Aptitude (moderate)
30 mins Technical (difficult)
Out of all eligible students for the test about 30 of them were screened out for GD.
We were called in a group of about 8-10 people. The topic which our group got was, "Will India remain way behind China?". All other topics were related to current affairs.
No one knows what the topic of GD is going to be. Hence, it will be a good idea to keep yourself abreast with Current Affairs.
Your favorite subjects will be asked first and then they start questioning what they want you to answer. So choose the subject wisely.
Also, since Caterpillar recruits for its heavy engine manufacturing division, be prepared for questions specifically in the field of IC engines ,Thermodynamics, Production process etc that are employed in engine manufacturing.