The most important things when it comes to visual breaks in the text are on one hand the POV and on the other giving the reader a natural pause in the reading.
So, to answer your question: You can have more than one scene per chapter and you can have chapters as long or as short as you want.
Chapters aren't really that important in reading. Other aspects are way more important, but here are some thoughts:
The natural pause in the reading may be something you want, or maybe you want to be a stern taskmaster when it comes to the reader... it's of course always going to be judged in their eyes anyway. Providing a chapter break where a reader can put the book down (especially if it's a chapter ending with some kind of hook) can make it more likely they will pick it back up later.
With respect to the POV, if you have more than one POV it's important to mark when the text changes POV (unless you're doing head-hopping, then you usually cannot use visual markers in the text).
For instance, having a distinctive scene or chapter in one POV and then using a break when the POV changes are a good idea.
But if you have only one POV, nothing prevents you from creating a one-chapter never-ending flow of text with no breaks or divisions at all. Even more so when the text isn't a full novel.
If you look at Veronica Roth's "Divergent" you'll see she's very conservative with these kinds of breaks and sometimes it's even jarring.
Of course, being jarring to the reader is never a good idea (unless it's intentional).
You may need to use something in between your scenes. I call them "transports" and it could be a sentence or a paragraph moving us from one scene to the next.
While these can be helpful to create a natural flow, I also suggest always trying to remove them (replace them with a blank line, "***" or similar) and see if it works anyway. "Transports" should only be used when they are really needed...