The Diesel Mechanics section in RRB ALP CBT-2 (Part B) plays a decisive role in final selection. Many candidates clear CBT-1 easily but fail to qualify CBT-2 only because of weak trade preparation.
The good news?
✔ Diesel Mechanics is a scoring subject if prepared systematically.
Even if you have:
Limited time
Weak basics
Long study gaps
You can still crack this section in 30 days with the right approach.
This blog gives you a complete roadmap—from syllabus understanding to daily planning, MCQ practice, revision methods, and exam-day strategy.
| Feature | Details |
|---|---|
| Section Name | Diesel Mechanic (Trade Test) |
| Exam Stage | CBT-2 |
| Total Questions | 75 |
| Total Marks | 75 |
| Time Duration | 60 Minutes |
| Nature | Qualifying (Mandatory) |
| Negative Marking | 1/3 mark deduction |
✔ Important: If you fail Part B, your Part A marks will not be considered.
Focus only on exam-oriented topics, not unnecessary theory.
| Unit | Topics Covered |
|---|---|
| IC Engines | Engine parts, working, cycles |
| Engine Types | 2-stroke & 4-stroke diesel engines |
| Fuel System | Fuel pump, injector, nozzle, governor |
| Cooling System | Radiator, thermostat, water pump |
| Lubrication System | Wet sump, dry sump, oil filters |
| Air System | Air cleaner, turbocharger |
| Engine Maintenance | Overhauling, tolerances |
| Troubleshooting | Faults, causes, remedies |
| Electrical System | Starter, alternator, battery |
| Heat Engines | Efficiency, losses, basics |
| Activity | Daily Time |
|---|---|
| Theory Study | 2–2.5 Hours |
| Diagrams & Notes | 1 Hour |
| MCQ Practice | 1–1.5 Hours |
| Revision | 30 Minutes |
| Total | 4.5–6 Hours |
Goal: Understand engine basics clearly.
| Day | Study Focus |
|---|---|
| Day 1 | Diesel engine components & functions |
| Day 2 | 2-stroke vs 4-stroke engines |
| Day 3 | Valve timing & engine cycles |
| Day 4 | Combustion process in diesel engine |
| Day 5 | Basic heat engine concepts |
| Day 6 | MCQs + diagram practice |
| Day 7 | Revision + mini test |
Goal: Master scoring systems.
| Day | Study Focus |
|---|---|
| Day 8 | Fuel injection system |
| Day 9 | Fuel pump & injector types |
| Day 10 | Cooling system |
| Day 11 | Lubrication system |
| Day 12 | Air intake & exhaust |
| Day 13 | MCQs + revision |
| Day 14 | Full sectional test |
Goal: Score from practical knowledge.
| Day | Study Focus |
|---|---|
| Day 15 | Engine overhauling |
| Day 16 | Wear, clearances, tolerances |
| Day 17 | Common engine faults |
| Day 18 | Diesel electrical system |
| Day 19 | Mixed MCQs |
| Day 20 | Mock test |
| Day 21 | Analysis & weak areas |
Goal: Accuracy + speed.
| Day | Study Focus |
|---|---|
| Day 22 | Full syllabus revision |
| Day 23 | Fuel system revision |
| Day 24 | Troubleshooting revision |
| Day 25 | Electrical + cooling |
| Day 26 | Full mock test |
| Day 27 | Error correction |
| Day 28 | Rapid revision |
| Day 29 | Light study |
| Day 30 | Final revision |
| Feature | Diesel Engine | Petrol Engine |
|---|---|---|
| Ignition | Self ignition | Spark plug |
| Compression Ratio | High | Low |
| Efficiency | High | Low |
| Fuel Consumption | Low | High |
| Fault | Cause | Remedy |
|---|---|---|
| Black smoke | Excess fuel | Injector adjustment |
| White smoke | Water in fuel | Drain fuel |
| Knocking | Early injection | Timing correction |
| Overheating | Cooling failure | Check radiator |
| Low oil pressure | Worn pump | Replace pump |
| Level | MCQs/Day |
|---|---|
| Beginner | 30–40 |
| Intermediate | 50–60 |
| Final Phase | 80–100 |
✔️ Focus on concept-based MCQs
✔️ Avoid blind guessing
Daily revision – Last 30 minutes
Weekly revision – Every 7th day
Final revision – Last 5 days
Diagrams
Fault-cause tables
Formula & efficiency relations
Frequently wrong MCQs
❌ Studying without MCQs
❌ Ignoring diagrams
❌ No mock test analysis
❌ Studying new topics at the end
❌ Overconfidence after CBT-1
| Time | Action |
|---|---|
| First 10 min | Easy questions |
| Next 30 min | Moderate questions |
| Last 20 min | Tough & review |
✔ Attempt only sure questions first.
Q1. Is Diesel Mechanics difficult?
No, it is logical and practical. With diagrams and MCQs, it becomes easy.
Q2. Is 30 days enough?
Yes, if you follow a strict daily plan and revise regularly.
Q3. Are numerical questions asked?
Very few. Mostly conceptual and fault-based MCQs.
Diesel Mechanics is not about memorizing books—it’s about understanding systems, practicing MCQs, and revising smartly.
If you stay consistent for 30 days:
✔ You will qualify Part B
✔ You will gain confidence
✔ You will move one step closer to ALP selection
Makeiteasy
“Download our app now to unlock a world of convenience and seamless access to our extensive range of features, including live and recorded classes, study material, Test series and thousand of practice questions—all at your fingertips!”
Leave a Comment