RRB ALP aspirants from the Diesel Mechanic trade, one thing is non-negotiable:
If you don’t clear Part-B (Diesel Mechanics), your selection ends—no matter how good your Part-A score is.
Yet many candidates start preparation without clearly understanding:
What exactly is the RRB ALP Diesel Mechanics syllabus?
Which topics carry maximum marks?
Which areas are most important and repeatedly asked?
This blog solves that problem completely.
In this detailed guide, you will get:
Official RRB ALP Diesel Mechanics syllabus explained
Topic-wise marks & question weightage
High-scoring and most important areas
Practical exam-oriented insights for CBT-2
Before diving into the syllabus, let’s clearly understand where Diesel Mechanics fits in the exam.
| Section | Subject | Questions | Marks | Duration |
|---|---|---|---|---|
| Part A | Maths, Reasoning, General Science | 100 | 100 | 90 min |
| Part B | Diesel Mechanics (Trade) | 75 | 75 | 60 min |
Important Rule:
Part-B is qualifying in nature, but failure = total disqualification, even if Part-A score is high.
The Diesel Mechanics syllabus for RRB ALP CBT-2 is based on ITI Diesel Mechanic trade standards, focusing on engine systems, working principles, and fault diagnosis.
The questions are:
Conceptual
Practical-oriented
Mostly direct and diagram-based
Below is the detailed syllabus breakup, exactly aligned with RRB expectations.
Introduction to IC Engines
Difference between Petrol & Diesel engines
Classification of diesel engines
Engine terminology (Bore, Stroke, TDC, BDC)
Expected Weightage: 6–8 Questions
Four-stroke diesel cycle
Two-stroke diesel engine
Comparison between 2-stroke & 4-stroke engines
Indicated power, brake power (basic concept)
Expected Weightage: 6–7 Questions
Fuel supply system layout
Inline & rotary injection pump
Injectors and spray pattern
CRDI (Common Rail Direct Injection)
Fuel filters and high-pressure pipes
Expected Weightage: 10–12 Questions
Highest scoring section
Air cleaner types
Intake manifold
Exhaust manifold
Importance of proper air-fuel ratio
Expected Weightage: 4–5 Questions
Purpose of engine cooling
Air cooling vs water cooling
Radiator, water pump, thermostat valve
Causes of engine overheating
Expected Weightage: 5–6 Questions
Purpose of lubrication
Types of lubrication systems
Oil pump, oil filter, oil sump
Effects of poor lubrication
Expected Weightage: 5–6 Questions
Principle of turbocharger
Exhaust gas turbocharging
Advantages of turbocharging
Intercooler basics
Expected Weightage: 3–4 Questions
Piston, piston rings, connecting rod
Crankshaft, camshaft
Valves and valve timing
Flywheel and bearings
Expected Weightage: 8–10 Questions
Heat engine definition
Thermal efficiency
Diesel cycle basics
Losses in IC engines
Expected Weightage: 6–8 Questions
Engine knocking
Black, white & blue smoke causes
Overheating problems
Low power output reasons
Preventive maintenance
Expected Weightage: 8–10 Questions
| Topic | Expected Questions |
|---|---|
| Diesel Engine Basics | 6–8 |
| IC Engine Cycles | 6–7 |
| Fuel Injection System | 10–12 |
| Air & Exhaust System | 4–5 |
| Cooling System | 5–6 |
| Lubrication System | 5–6 |
| Turbocharging | 3–4 |
| Engine Components | 8–10 |
| Heat Engine Basics | 6–8 |
| Maintenance & Defects | 8–10 |
| Total | 75 Questions |
If your time is limited, prioritize these first:
Fuel Injection System
Engine Components & Valve Mechanism
Cooling & Lubrication comparison
Diesel engine defects & smoke analysis
Turbocharger working principle
✔ These areas alone can fetch 35–40 marks.
✔ Follow topic-wise study, not random reading
✔ Focus on diagrams and flow paths
✔ Practice MCQs after every topic
✔ Revise weak areas weekly
✔ Avoid over-theory; think exam application
Yes. The RRB ALP Diesel Mechanics syllabus is fully based on ITI trade standards.
Exactly 75 questions in CBT-2 Part-B.
Yes, but failure leads to complete rejection, so it must be taken seriously.
Very limited—mostly basic efficiency or power concepts.
Understanding the RRB ALP Diesel Mechanics syllabus is the first step toward selection.
✔ The syllabus is predictable
✔ Weightage is clearly defined
✔ Questions are concept-based, not tricky
✔ If you prepare topic-wise with focus on high-weight areas, clearing CBT-2 becomes realistic and achievable.
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