solas
Scribe
Should every chapter have a cliff hanger at the end?
If your book is structured to follow a few semi-independent threads (as is popular these days - see ASOIAF, the First Law trilogy, and many more) then cliffhangers are better, since you actually get a break from each character's story. Then the cliffhanger has real effect, since you have a bit more reading to do until you find out what happens.
Chapter breaks should have some sort of resolution, like a task accomplished or a thing learned, or whatever. Cliffhangers are good, but in that structure, it's better to use them sparingly.