Main Topics covered under ONGC or Oil and Natural Gas Corporation Limited Graduate Trainee (Electrical Engineering) written test are:

• General Awareness
• Electrical Engineering
• Reading Comprehension
• Verbal/ Non-verbal Reasoning
• Quantitative Aptitude
• Data Interpretation

Reference Books

Books for General Awareness
• Competition Success Review
• Manorama Year Book
• Prathiyogitha Darpan
• General Awareness & Current Affairs by Manohar Pandey

Books for Quantitative Aptitude
• Quicker maths by M.Tyra
• Quantitative aptitude by R S Agarwal

Books for Verbal/ Non-verbal Reasoning
• A Modern Approach to Verbal and Non Verbal Reasoning by R S Agarwal
• Critical Reasoning Preparation Guide by Manhattan

Books for Reading Comprehension
• Objective General English by Puri
• English Language by Lucent’s General English

Technical Section

Technical Section will contain questions from the following topics.
• Analog Electronic circuits
• Digital Electronic circuit
• Electric Circuit theory
• Thermal Power Engineering
• Electrical & Electronic measurement
• Electric Machine

Books for Analog Electronic circuits
• Microelectronic Circuits by Sedra & Smith
• Electronic devices & Circuits by Balbir Kumar & Shail B. Ja
• Integrated Electronics by Milman & Halkias
• Electronic principles by Malvino
• Electronic Devices -System & Application by Robert Diffenderfer

Books for Digital Electronic circuit
• Digital Principles & Application by Leach & Malvino
• Modern Digital Electronics by R.P. Jain
• Fundamental of Digital Circuits by A. Anand Kumar
• Fundamental of logic Design by Charles H. Roth

Books for Electric Circuit theory
• Network Analysis by M.E. Valkenburg
• Engineering Circuit Analysis by W.H. Hyat, J.E. Kemmerly
• Fundamental of Electric Circuits by Charles K. Alexander
• Introduction to Electric Circuits by Richard C. Dorf, James A. Svoboda

Books for Thermal Power Engineering
• Fundamental Mechanics of Fluids by Currie, LG
• Fundamentals of Heat and Mass Transfer by Incropera, P.P. and Dewitt
• Extended Surface Heat Transfer by Kraus, A.D., Aziz, A

Books for Electrical & Electronic measurement
• A course in Electrical and electronic Measurement and Instrumentation by Sawhney AK
• Electrical Measurements & Measuring instruments by Rajendra Prasad
• Modern Electronic instrumentation and measurement techniques by Albert D Halfride

Books for Electric Machine
• A Course in Electrical Engineering by Chester L. Dawes, S. B
• Design of Electrical Machinery by By William T. Ryan
• Electric Machine Design by Henry Metcalfe Hobar