How do I answer the salary question in interviews?

In the spring I'll be graduating with a mechanical engineering degree and 20 months of relevant work experience through internships. I have an interview coming up for an entry level position in the nuclear field in Canada, I'd really like to land this position.

Here's my problem, I hate the salary question during interviews. I'm never quite sure of the correct answer purely because I'm still getting used to the fact that I have an option other than minimum wage. Does anyone have any advice on how to tackle this? Or possibly any other engineers who are willing to share what they earned entering the field? I tried looking it up and the average seems to fall between 50-60k, but they don't seem like reliable sources.

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official