CATEGORY I - CIVIL ENGINEERING

Group A Services / Posts:

1. Indian Railway Service of Engineers.
2. Indian Railway Stores Services (Civil Engineering Posts).
3. Central Engineering Service.
4. Indian Defence Service of Engineers (Civil Engineering Posts).
5. Indian Ordance Factories Services.
6. Central Water Engineering Gr. 'A' Service (Civil Engineering Posts).
7. Central Engineering Service (Roads) Group-A. (Civil Engineering Posts)
8. Assistant Executive Engineer (Civil Engineering Post) (in Border Roads Engineering Service Gr. 'A').

CATEGORY II - MECHANICAL ENGINEERING

Group A Services / Posts:

1. Indian Railway Service of Mechanical Engineers.
2. Indian Railway Stores Service (Mechanical Engineering Posts).
3. Central Water Engineering Gr. 'A' Service (Mechanical Engineering Posts).
4. Central Power Engineering Service (Mechanical Engineering Posts).
5. Indian Ordnance Factories Service.
6. Indian Naval Armament Service (Mechanical Engineering Posts).
7. Assistant Executive Engineer Group 'A' (Mech. Engineering Posts) in the corps of EME, Ministry of Defence.
8. Assistant Naval Stores Officer, Grade-I (Mechanical Engineering Posts) in Indian Navy.
9. Central Electrical & Mechanical Engineering Service (Mechanical Engineering Posts).
10. Assistant Executive Engineer (Electrical and Mechanical) [Mechanical Engineering post] in Border Roads Engineering Service Group 'A').
11. Indian Supply Service, Group 'A' (Mechanical Engineering Posts).
12. Indian Defence Service of Engineers (Mechanical Engineering Posts).
13. Central Engineering Service (Roads) Group 'A' [Mechanical Engineering posts].

CATEGORY III - ELECTRICAL ENGINEERING

Group A Services / Posts:

1. Indian Railway Service of Electrical Engineers.
2. Indian Railway Stores Service (Electrical Engineering Posts).
3. Central Electrical and Mechanical Engineering Service (Electrical Engineering Posts).
4. Indian Naval Armament Service (Electrical Engineering Posts).
5. Indian Ordnance Factories Service.
6. Central Power Engineering Service (Electrical Engineering Posts).
7. Indian Defence Service of Engineers (Electrical Engineering Posts).
8. Assistant Naval Stores Officer, Grade-I (Electrical Engineering Posts) in Indian Navy.
9. Indian Supply Service Group 'A' (Electrical Engineering Posts).
10. Assistant Executive Engineer Group 'A' [Electrical Engineering post] in the corps of EME, Ministry of Defence.

CATEGORY IV - ELECTRONICS & TELECOMMUNICATION ENGINEERING

Group A & B Services / Posts:

1. Indian Railway Service of Signal Engineers.
2. Indian Railway Stores Service (Telecommunication / Electronics Engineering Posts).
3. Indian Naval Armament Service (Electronics Engineering Posts).
4. Assistant Executive Engineer Group 'A' (Electronics & Telecommunication Engineering Posts) in the Corps of E.M.E., Ministry of Defence.
5. Central Power Engineering Service, Group 'A' [Electronics and Tele Communication Engineering Service].
6. Engineer (GCS-Group-'A') in Wireless Planning and Co-ordination Wing / Monitoring Organisation. (M/o Communications & I.T., D/o Telecommunications).
7. Assistant Naval Stores Officer Grade - I (Electronics & Telecom Engineering Posts) in Indian Navy.
8. Indian Supply Service, Group 'A' (Electronics & Telecommunication Engineering Posts).
9. Indian Inspection Service Group 'A' [Electronics and Telecommunication Engineering Posts].
10. Indian Telecommunication Service Group 'A'.
11. Junior Telecom officer [General Central Service Group 'B' Gazetted Non-Ministerial].