The eligibility criteria for Rajasthan Public Service Commission (RPSC) Assistant Engineer (AEN) exam typically vary slightly depending on the engineering discipline. Here are the general eligibility criteria for AEN in Civil, Mechanical, and Electrical disciplines:

1. Nationality: The candidate must be a citizen of India.

2. Age Limit: The candidate must generally be between 21 to 40 years of age. However, age relaxations may apply for certain categories as per government norms.

3. Educational Qualification:

- For Civil Engineering: A Bachelor's degree in Civil Engineering from a recognized university or institution. The degree should be accredited by the All India Council for Technical Education (AICTE) or an equivalent authority.

- For Mechanical Engineering: A Bachelor's degree in Mechanical Engineering from a recognized university or institution. The degree should be accredited by the All India Council for Technical Education (AICTE) or an equivalent authority.

- For Electrical Engineering: A Bachelor's degree in Electrical Engineering from a recognized university or institution. The degree should be accredited by the All India Council for Technical Education (AICTE) or an equivalent authority.

4. Physical Fitness: Candidates may need to fulfill certain physical fitness criteria as specified by the RPSC.