Why companies ask such a question: 'what is ur expected salary' without taking into consideration the job description Is this a confusing situation ?

Dear Mohamed,

  1st of all i'd like to thank you to invite me for answering this question, you are right if the job description is not specified this question will be useless, as i have to know what will be my responsibilties first inordr to give me the chance to ask for the equivilant salary ven it will be from my own of view.

in addition and if we go with the right way and procedures and assuming that the interviewer is well prepared , it will be mandatory to ask you such a question after offering you the Job description and he   will really have to know if your expectations will match the salary range for the job he want to fill or not and these will require an already existing salary structure which is the scheme of the company salaries.