Is it advisable to apply to two or more different positions in the same company?

I would say it is ok as long as you are seriously interested and qualified for each job that you apply for. Just make sure that you are not randomly applying in hopes of getting out of a job that you dislike. This could signal that you are looking for a temporary solution, and less likely to stay, and an employer will be less likely to hire you. If a potential employer asks you about the number of applications, just be honest and say that your qualifications and interests are well-suited for each position, and that you would hate to let a potential opportunity pass you by.How else can you get those jobs if you don't apply for them?:)