For the written test there were 10 Aptitude questions related to logical reasoning, relationship, coding-decoding, and basic mathematics like SI, CI, P&C, Speed distance time etc. And 10 Technical questions related to Thermodynamics, IC engine (mostly) and Material science/technology. After that on clearing written round there was an interview round with HR head, Quality head and Production head. All the questions will be based on your resume and what you tell them in your self introduction.