How can I prepare myself for an interview for a Project Manager job? And what kind of questions should I expect to be asked?

I would suggest below mentioned suggestions,

1. Review your resume and focus more on such expertise which are discussed less.

2. Prepare comprehensive response of three most common questions,

     Tell us about you or why we hire you?

     Tell us about the most important/challenging project of your career?

     What do you spend the most time doing each day?

3. They will also ask questions related to your industry or area of expertise.

4. Your answer must be structured and should contain three important factors

Introduction

Main body of you answer

Conclusion

There might be some other killer questions like

What Methods Will You Use to Deliver the Results?

In your opinion what one skill does a Project Manager need for success?

How you manage your project team?

How do you managed key stakeholders?

Have you improved project management processes at your current firm?

Thanks,