I know that they do it all the time in movies, but in your novels, you can't make stuff up. If you need to know how something works, do your homework! Don't make it up as you go along, because someone will know if you get it wrong.
Okay, I will take it back a little bit. If you make something up that your readers can call you on... don't do. I do have a funny story though about a writer who made up a sort of lock that did something unheard of. He was amused to see that lock show up in another novel a few years later.