RRB ALP CBT 2 Mechanic Diesel Trade Syllabus 2026, Complete Topic Wise Syllabus & Exam Pattern
🗓️ Last Updated: 16 Jun 2026 | 👁️ Views: 23
RRB ALP CBT 2 Mechanic Diesel Trade Syllabus 2026, Complete Topic Wise Syllabus & Exam Pattern
Candidates appearing for RRB Assistant Loco Pilot (ALP) CBT 2 Part B under Mechanic Diesel Trade should prepare according to the latest ITI Diesel Mechanic syllabus. The examination mainly covers diesel engines, fuel systems, lubrication systems, cooling systems, transmission systems and vehicle maintenance. Check the complete syllabus and exam pattern below.
RRB ALP CBT 2 Mechanic Diesel Exam Pattern 2026
| Exam Component | Details / Criteria |
|---|---|
| Exam Name | RRB Assistant Loco Pilot (ALP) Recruitment 2026 |
| Exam Stage | CBT 2 - Part B (Technical Trade Test) |
| Concerned Trade | Mechanic Diesel Trade (ITI Standard) |
| Total Number of Questions | 75 Questions |
| Maximum Marks | 75 Marks |
| Time Duration | 60 Minutes (1 Hour) |
| Type of Questions | Objective Type Multiple Choice Questions (MCQs) |
| Qualifying Percentage | 35% Marks (Compulsory for All Categories) |
| Required Passing Marks | 26.25 Marks out of 75 |
| Negative Marking | 1/3 Mark deducted for every wrong answer |
RRB ALP CBT 2 Mechanic Diesel Trade Syllabus 2026
1. Workshop Safety
- Industrial Safety Regulations & Hazard Identification
- Personal Protective Equipment (PPE) Selection & Uses
- Fire Safety (Classes of Fires & Correct Extinguishers)
- First Aid Practices & Emergency Response Steps
- Workshop General Rules & 5S Cleanliness Concept
2. Engineering Drawing
- Lines, Lettering, and Standard Symbols
- Orthographic Projection (First Angle & Third Angle)
- Machine Components Drawings & Blueprints
- Dimensioning Systems & Sectional Views
- Limits, Tolerances, and Fits Systems
3. Measuring Instruments
- Linear Measurements: Steel Rule, Try Square, Outside/Inside Calipers
- Precision Instruments: Vernier Caliper, Outside/Inside Micrometers
- Dial Test Indicator (DTI) & Bore Gauges
- Feeler Gauge, Wire Gauge, and Pitch Gauges
- Least Count Calculations and Zero Error Corrections
4. Diesel Engine Fundamentals
- Two Stroke and Four Stroke Engine Working Principles
- Comparison of Diesel (CI) Engines vs Petrol (SI) Engines
- Engine Components: Cylinder Block, Piston, Connecting Rod, Crankshaft, Valves
- Engine Nomenclature: Bore, Stroke, Swept Volume, Clearance Volume
- Compression Ratio and Thermal Efficiency Concepts
5. Fuel System
- Fuel Feed Pumps and Fuel Injection Pumps (FIP)
- Types of Fuel Injectors & Nozzle Testing
- Fuel Filters (Primary and Secondary) & Water Separators
- Common Rail Direct Injection (CRDI) Basics
- Air Bleeding Procedures from Fuel Circuit
6. Lubrication System
- Types of Engine Lubrication Systems (Splash, Pressure Systems)
- Properties of Lubricating Oils & SAE Viscosity Ratings
- Oil Pumps (Gear Type, Rotor Type) & Relief Valves
- Oil Filters and Oil Coolers
- Engine Lubrication Circuit & Pressure Troubleshooting
7. Cooling System
- Air Cooling and Water/Liquid Cooling Systems
- Radiator Construction, Cap Operation, and Recovery Tank
- Water Pump, Fan Belt Tension, and Cooling Fan
- Thermostat Valve Functioning & Temperature Ranges
- Antifreeze Solutions and Coolant Mixtures
8. Transmission System
- Clutch Types (Single Plate, Multi-Plate) & Operating Mechanisms
- Manual Gear Box Types & Gear Ratio Concepts
- Propeller Shaft, Universal Joints, and Slip Joints
- Differential Assembly & Rear Axle Working
- Final Drive Operation
9. Electrical System
- Lead Acid Battery Construction, Rating, and Hydrometer Testing
- Starter Motor Circuit & Solenoid Switch Operation
- Alternator Mechanism and Voltage Regulators
- Vehicle Lighting Circuits & Dashboard Indicators
- Basic Auto-Wiring, Fuses, and Relays
10. Chassis and Vehicle Systems
- Braking Systems (Hydraulic, Air Brakes, ABS Basics)
- Suspension Systems (Leaf Springs, Coil Springs, Shock Absorbers)
- Steering Mechanisms and Wheel Alignment Basics
- Tyres Construction, Wear Patterns, and Wheel Balancing
11. Engine Maintenance & Troubleshooting
- Preventive, Scheduled, and Breakdown Maintenance Routines
- Common Engine Faults: Black/White Smoke, Low Oil Pressure, Overheating
- Engine Troubleshooting Guides & Diagnostic Tools
- Engine Overhauling Basics & Gasket Replacement
12. Engineering Materials
- Ferrous Metals (Cast Iron, Carbon Steels, Alloy Steels)
- Non-Ferrous Metals & Engine Bearing Alloys
- Heat Treatment Processes (Annealing, Hardening, Case Hardening)
- Mechanical Properties of Automobile Materials
Preparation Tips for Mechanic Diesel Trade
- Focus on IC Engine Core: Prioritize deep concepts of 4-Stroke cycles, Valve Timing Diagrams, and Compression Ratios.
- Master Fuel Systems: Study FIP calibration, Injector nozzle spray patterns, and CRDI components as they carry heavy weight.
- Understand Electrical Testing: Learn battery specific gravity limits and troubleshooting of Starter Motors/Alternators.
- Solve Technical PYQs: Regularly solve previous year RRB ALP Mechanic Diesel trade question papers to match the level of MCQs.
RRB ALP CBT 2 Mechanic Diesel Trade FAQ
Q1. How many questions are asked in RRB ALP CBT 2 Mechanic Diesel Trade?
A. A total of 75 objective-type multiple-choice questions (MCQs) are asked in Part B.
Q2. Is Part B qualifying in nature?
A. Yes, Part B (Trade Test) is qualifying in nature. Its score won't affect the merit list, but passing it is compulsory.
Q3. What are the minimum qualifying marks for Mechanic Diesel Trade?
A. Candidates across all categories must secure at least 35% marks, which means scoring minimum 26.25 marks out of 75.
Q4. Is there negative marking in CBT 2 Mechanic Diesel paper?
A. Yes, a negative marking penalty of 1/3rd mark applies for every incorrect response.
Q5. What are the most important topics in Mechanic Diesel?
A. Diesel Engine Components, Fuel Injection Pumps, Cooling & Lubrication Circuits, Alternators, and Brake Systems.