Nothing wrong with asking questions unless they're such that it shows you have made little or no attempt to work out the answer for yourself first.
Use whatever resources are available to you to do a bit of research on issues yourself before bugging someone else. They will notice and appreciate it.
Question A (annoying) "I couldn't login, do you think it's because I didn't capatilise the first letter in my password, I thought case didn't matter? Please help me!"
Question B (reasonable) "I'm having an issue getting my SQL statement to work correctly. I have tried this, this and this, and spent half an hour on google trying to find a solution but I'm stumped. When you have a bit of time can you give me an assist please."
Question C (best question) "I need to do X, could you show me where I can find out how to do that?" (assuming that you're not talking to the person who was tasked to make the documentation which doesn't yet exist)
Also a lot of peoples attitudes can also hinge on how you take their answers as well. So:
Question D (possibly make people reluctant to find time although it may seem reasonable) I'm having an issue getting my SQL statement to work correctly. I have tried this, this and this, and spent half an hour on google trying to find a solution but I'm stumped. When you have a bit of time can you give me an assist please." (During and after which I want to engage in a long winded and non productive conversation on irrelevancies like I did last time)