Dear Alok,

The acronym for IES is Indian Engineering Services.

The acronym for PSU is Public Sector Undertakings.

Indian Engineering Services are the civil services that meet the technical and managerial functions of the Government of India.

IES officers are selected by the union government on the recommendations made by the Union Public Service Commission (UPSC). A combined four-stage competitive examination (comprising six tests), called the Engineering Services Examination (ESE) is conducted by the UPSC for recruitment to the Indian Engineering Services.

The eligibility criteria required for the iES examination are prescribed as below:-

* Completion of graduation in Engineering(B.Tech/B.E.) from any recognized college or university.

* Age limit:- 21-30 yrs.

* Completion of post-graduation in Wireless Communication, Electronics, Radio Physics, or Radio Engineering from any accredited university.

* Age relaxation:- 3 yrs for OBC and 5 yrs for SC/ST contenders.

* Nationality:- Indian.

PSU is related to government jobs conducted every year.

The list of all PSUs are prescribed as below:-

* DRDO.

* SAIL.

* GAIL.

* NTPC.

* BHEL.

* DEL.

* ONGC.

* OECL.

* BSNL.

* MTNL.

* SSC.

* CIL.

* IOCL.

* BEL.

* BEML.

* HPCL; etc..