Linde Project Engineer interview questions

I attended a pool drive . The interview has 4 steps , technical Test , Gd , Technical interview and Hr interview . I cleared three steps but unfortunately can't clear the HR interview. Somehow they didnot like me . I still cannot forget that failure.

This is for Project Engineer in Electronic Engineering Services. Interview is usually conducted with Project Manager(s) (Hiring), and the Business Manager. The Business Manager is technically very strong, particularly in the field of thermodynamics and fluid dynamics. The project managers expertise are more on execution/ implementation of projects. Could be quite a long drawn out process, 1-1/2 hour is typical. Fresh or recent graduates preferred.