It's not a one question it's many depends upon your experience and field you have worked.
Cad Designer Interview Questions
415 cad designer interview questions shared by candidates
What is the triple point of water?
Ask to solve part of machine design problem which require deep knowledge of mechanism component sizing using stress calculations.
What is your biggest weakness?
How come that I want a salary 4 times higher than my actual one? (it was a bit over the average in that country anyway)
Why are you the right candidate?
Do you have competency in surfacing
did you ever see one of your projects fail? elaborate on what happened and why.
Why I left my last job.
Where do you see yourself in five years?
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