I understand it can be very confusing. But in hindi we have something called कारक, you can read more about it here http://hindi.swiftutors.com/hindi-kaarak.html
But I am afraid it is all in Hindi.
Anyway, coming back to your question. Imagine the sentence having 4 parts. "kya" "tum" "raj ko" "jaante ho"
Now you can put these 4 parts in any random order and essentially the meaning would remain the same. Let's translate these parts one by one Kya - question indicator Tum - you (the one doing it) Raj ko - to Raj (now you don't need to translate को but remember it indicates that the action is affecting Raj but he is not doing it) Jaante ho - know (notice it is not passive because even in passive voice, as per your translation Raj would be the one doing the action of knowing, which we saw earlier that he is merely the recipient of the action and not the doer. The doer is you)
I know I may have confused you further. But I hope it gave a little clarity