Is it necessary for Iraqi citizen apply for transit visa if they pass only 2 hours?

Well, if you transit just 2 hours, you actually don't need to apply anything in advance because you are qualified for 24 hours free transit. However, there were some foreigners who were refused too. Last time, I heard that a Pakistani was refused. According to him, he was required to apply a transit type in advance. Where will do the transit? Perhaps, I can help you try to find out the contact information. Then you can confirm this with the airport.