Coding-Decoding
View Questions of Coding-Decoding
Reasoning - Coding-Decoding
What is Coding-Decoding?
This topic involves converting words or letters into a coded form and decoding them using logical rules. It's used to test your ability to spot letter/number patterns and substitutions.
Types of Coding
1. Letter Coding: Each letter is replaced based on its position or rule (e.g., shift by +1). 2. Number Coding: Words are represented by numbers based on position or sum of values. 3. Substitution Coding: One word or character is replaced by another as per instructions. 4. Symbol Coding: Assigning codes using symbols for letters/numbers.
Example Questions
- If CAT is coded as DBU, how is DOG coded?
Answer: EPH (Each letter +1) - If TEA = 25, how is BAT coded?
Answer: 23 (B=2, A=1, T=20 → 2+1+20=23) - In a code, BLUE is GREEN, GREEN is RED, RED is YELLOW. What is the color of blood?
Answer: YELLOW (Blood is RED, but RED=YELLOW in code)
Exam Tips
- Convert letters to number positions (A=1 to Z=26).
- Check for consistent rules like +1, −1, reverse, position swap, etc.
- Practice with both direct and reverse coding.
- Analyze code patterns in full word, not just initials.
Common Mistakes
- Assuming random codes without validating the logic.
- Forgetting to apply the same rule uniformly to all letters.
- Ignoring position-based shifts or mirror logic (e.g., A↔Z, B↔Y).
Quick Revision Checklist
- Memorize letter positions and common shifts.
- Practice sum-based number codings.
- Solve 20+ problems involving both encoding and decoding.
- Apply reverse logic if code looks backwards.
Summary: Coding-Decoding tests your ability to detect patterns in transformations. Mastery requires familiarity with letter positions, shift logic, and substitution techniques.
Topics
- Analogy
- Number Series
- Classification
- Series Completion
- Coding-Decoding
- Input Output
- Inequality
- Blood Relation
- Puzzle Test
- Sequential Output Tracing
- Direction Sense Test
- Linear Seating Arrangement
- Circular Seating Arrangement
- Logical Venn Diagrams
- Alphabet Test
- Number, Ranking and Time Sequence Test
- Mathematical Operations
- Logical Sequence of Words
- Arithmetical Reasoning
- Inserting The Missing Character
- Data Sufficiency
- Decision Making
- Assertion and Reason
- Situation Reaction Test
- Letter and Symbol Series
- Verification of Truth of the Statement
- Logic
- Statement - Arguments
- Statement - Assumptions
- Statement - Courses of Action
- Syllogisms
- Statement - Conclusions
- Deriving Conclusions From Passages
- Theme Detection
- Question - Statements
- Miscellaneous Logical Puzzles
- Mirror and Water Images
- Paper Folding and Cutting
- Completion of Incomplete Pattern
Other Subjects
- Prestressed Concrete
- Fluid Mechanics
- Geotechnical Engineering
- Ground Improvement Techniques
- Groundwater Engineering
- Highway Engineering
- Hydraulics and Hydraulic Machines
- Hydrology
- Irrigation Engineering
- Open Channel Flow
- Pavement Design
- Estimation, Costing and Valuation
- Railway Engineering
- Soil Mechanics
- Strength of Materials
- Structural Analysis
- Surveying
- Traffic Engineering
- Transportation Engineering
- Wastewater Treatment
- Water Supply and Sanitation
- Contracts and Specifications
- Reasoning
- Engineering Mathematics
- Air Pollution and Control
- Bridge Engineering
- Building Materials and Construction
- Concrete Technology
- Construction Equipment
- Construction Planning and Management
- Quantitative Aptitude
- Dam Engineering
- Design of RCC Structures
- Design of Steel Structures
- Drainage Engineering
- Earthquake Engineering
- Engineering Geology
- Engineering Graphics
- Engineering Mechanics
- Environmental Engineering
- General Awareness / General Knowledge (GK)