Engineering

First of all, you have not mentioned the post name. However, BEL Apprentice Exam Pattern:
1- Name of the Subject: Numerical Ability
No. Of Questions: 25
Maximum Marks: 25
Duration: 120 Minutes
2- Name of the Subject: Logical Ability
No. Of Questions: 25
Maximum Marks: 25
Duration: 120 Minutes
3- Name of the Subject: English
No. Of Questions: 25
Maximum Marks: 25
Duration: 120 Minutes
4- Name of the Subject: General Knowledge
No. Of Questions: 25
Maximum Marks: 25
Duration: 120 Minutes
5- Name of the Subject: Relevant Trade
No. Of Questions: 20
Maximum Marks: 20
Duration: 120 Minutes
For more details, you may visit the Shiksha BEL exam page. (https://www.shiksha.com/exams/bel-exam). I hope this will help you.

Firstly, let's talk about agriculture, Agriculture is the art and Science of cultivating the soil, growing crops and raising livestock. It includes the preparation of plant and animal products for people to use and their distribution to markets. Now let's talk about food Biotechnology, Food biotechnology is an umbrella term covering a vast variety of processes for using living organisms-such as plants, animals, microbes, or any part of these organisms-to develop new or improved food products. Now about the food technology, Food technology is the application of food Science to the selection, preservation, processing, packaging, distribution, and use of safe food. So, form these details we can surely tell that food technology is more relatable than food Biotechnology to agricultural domains, because in the case of both the agriculture and food technology, it includes the preparation of plant and animal products for people to use and their distribution to markets. But in food Biotechnology we can create recombinant plants which is not the feature of agriculture or food technology.

The BEL syllabus includes English Logical Reasoning, General Knowledge, and Technical subjects.
1- Logical Reasoning: Cause and Effect, Clocks, Coding-Decoding, Critical path, Reasoning Analogies, Artificial Language, Blood Relations, Calendars, Mirror and Water Images, Odd One Out, Alphanumeric series, Cubes and cuboids, Data Sufficiency, Decision Making, Deductive Reasoning/Statement Analysis, Dices, Directions, Embedded Images, Figure Matrix, Input-Output.
2- English Syllabus: Reading Comprehension, Cloze Test, Article Rules, Direct Indirect Speech Rules, Sentence Rearrangement Para jumbles, Rules For Tenses, Rules For Prepositions, List of Prepositions, Rules, and List of Conjunctions, Letter Writing Format, Precis Writing, List of Homophones/Homonyms, List of Synonyms and Antonyms, Idioms And Phrases, Spotting the Error, Adjective Degree Of Comparison Rules, Sentence Correction Questions, Adjective Degree Of Comparison Rules, Active And Passive Voice Rules, List of One-Word Substitutions, Sentence Correction Questions.
3- General Knowledge: Culture, Religion, Animal, Flag, History, Anthem, Awards, Authors, Abbreviations, Discoveries, Diseases and Nutrition, Song, Flower, Important National Facts, Heritage and Arts, Dance, Currencies, Bird.

The BEL deputy engineer Entrance Exam is an objective type test having MCQs on the following:
1- General Aptitude
2- Comprehension/ Passage based questions
3- Data Interpretation
4- Logical Reasoning
4- General Knowledge questions
5- Technical Questions from subjects :
Engineering Mathematics: Linear Algebra Probability Calculus, Statistics Differential Equations Numerical Methods, and Transform Theory. Electronics and Communication Engineering: VLSI Design, Electronic Devices and Circuits, Bharat Digital Signal Processing, Digital Electronics, Electrical Technology, Control Engineering, Digital Communication, Principles of Communication, Industrial Instrumentation, Microcontrollers and Applications, Optical Communication, Embedded Systems Design, Power Electronics, Electromagnetic Fields, Network Analysis, Signals and Systems, Advanced Antenna Theory, Digital Image Processing, Electronic Measurement & Instruments, Analog Circuits, and Radars. The number of questions may vary but generally, the General aptitude has around 30 questions and technical questions are usually straightforward. The main focus for ECE is on Digital electronics, especially the logic family. Also in Electro Magnetic Theory most of the questions are from Antenna and Waveguide Theory.

A list of the best electrical branch books for the BEL examinations is listed below;
General Knowledge;
1- Manorama Year Book by Mammen Mathew
2- Lucent General Knowledge by Dr. Binay Karna
3- General Knowledge by Manohar Pandey
General Aptitude;
1- A Modern Approach to Logical Reasoning by R S Aggrawal
2- Analytical Reasoning by MK Pandey
3- A New Approach to Reasoning by B. S Sijwali.
Electrical Engineering;
1- Objective Electrical Technology by VK Mehta & Rohit Mehta
2- Question Bank for Electrical Engineering by J. B Gupta
3- A Handbook of Electrical Engineering by Arihant Publications
4- Electric Circuits and Networks by KS Suresh Kumar
5- A Text of Electrical Technology by BL Theraja and AK Theraja
6- Linear Circuits Analysis by DeCarlo Lin
7- Microcomputers and Microprocessors: Programming, Interfacing, and Troubleshooting by John E. Uffenbeck. I hope this will help you.

There are many exams after the 12th class for the engineering field some of them are;
1- Joint Entrance Examination JEE Main and JEE Advanced
2- Karnataka Common Entrance Test (KCET)
3- BITSAT (Birla Institute of Technology & Science Admission Test)
4- VITEEE (Vellore Institute of Technology Engineering Entrance Exam)
5- NATA (National Aptitude Test in Architecture)
6- MHT CET (Maharashtra Common Entrance Test)
7- WBJEE (West Bengal Joint Entrance Examination)
8- Andhra Pradesh EAPCET (Andhra Pradesh Engineering, Agriculture and Pharmacy Common Entrance Test)
9- COMEDK (Consortium of Medical, Engineering, and Dental Colleges of Karnataka)
10- KEAM (Kerala Engineering Architecture Medical Examination)
11- KCET (Karnataka Common Entrance Test)
12- UPSEE (Uttar Pradesh State Entrance Exam)
13- OJEE (Odisha Joint Entrance Examination)
14- IPU CET (Guru Gobind Singh Indraprastha University Common Entrance Test)
15- CUSAT CAT (Cochin University of Science & Technology Common Admission Test)
16- AUEET (Andhra University Engineering Entrance Test)
17- KIITEE (Kalinga Institute of Industrial Technology Entrance Examination)
18- IMUCET (Indian Maritime University Common Engineering Test)
19- SRMJEEE-UG (SRM Joint Engineering Entrance Exam Undergraduate)
20- ICFAI Tech (ICFAI Tech School Admission Test)
National Level Engineering Entrance Exams:
1- Indian Maritime University Common Entrance Test
2- Indian Navy B.Tech Entry Scheme
3- Indian Navy Sailors Recruitment
4- Indian Army Technical Entry Scheme (TES)
5- National Defence Academy and Naval Academy Examination (I)
I hope this will help you.