paper and pencil problems

I need some paper and pencils problems to practice pneumatic conveyor design and/or troubleshooting. Do you know of any books or course material (freely available) where I can find that?

Currently all I have is two solved examples on dilute phase conveying.

I thought the courseware section of some university would be helpful, specifically the material for the course on "solids processing" for Chemical Engineering, but so far I haven't found anything like that. ■