UPSC (Union public service commission) holds a common exam for the engineering categories. It includes Civil engineering, Mechanical engineering, Electrical engineering and Electronics and telecommunication engineering.
We can find all announcements by UPSC in Employment newspaper. In that they include all details like eligibility criteria, venue, exam date, syllabus, exam pattern, number of papers, total number of marks. For engineering category the UPSC exam structure is as below:
Paper I:
General Ability Test (It includes two parts Part A: General English, Part B: General Studies) and have 200 marks.
Paper II & III:
It includes the actual branch for which student have applied i.e., Civil Engineering/Mechanical Engineering/Electrical Engineering/Electronics & Telecommunication Engineering. This is an objective test and have 200 marks for each paper.