I'll second RoseCross here.
In addition, I think your mindset matters a lot when asking repeated questions - well, I guess it always matters, but especially so when doing something dubious, like asking repeated questions or doing something to "test" the deck.
If you're repeating the question because you didn't like the answer, didn't believe it, or want to put the deck to test, the answers will probably become more unclear and/or negative.
I've seen this happen a few times, and when it does, it feels as if the deck has a will of its own and is deliberately f***ing with you - and taking great delight in doing so. For example, my husband once kept a deck of normal playing cards next to him, and dared ask a Tarot deck whether the next card he'd pull would be big or small. The Tarot deck's answer was, "Fortune!"
![:smt003](./images/smilies/003.gif)
To top it off, the card he pulled was 7, so it was nether big nor small.
However, if you're repeating the question simply because you're confused about the matter or you're new to Tarot and aren't sure if you interpreted the card(s) right, I don't think it'll have any negative effects. In that case, I suppose the following cards actually might help you clear up the matter.
In any case, I wouldn't recommend asking the same question over and over. If you need clarification on some issue and aren't sure about the card(s) you've pulled, try asking the deck for clarification or ask some follow-up questions that would bring some new insight on the matter. (Sometimes, when I'm really confused, I simply ask my deck, "Why did you give me this card?") If you're asking about a situation that really worries you and actually
does change each day, I don't think it's wrong to consult the deck everyday, asking something like, "how are things developing today" or something similar.