When it comes to RRB ALP CBT-2, aspirants have one common fear:
“Diesel Mechanics clear ho jayega ya nahi?”
Despite studying theory and solving MCQs, many candidates still carry doubts about:
Syllabus coverage
Number of questions
Difficulty level
Importance of previous year questions
Safe score to qualify
That’s exactly why FAQ-based content works best for this subject.
This blog answers all the most searched and practical questions related to Diesel Mechanics for RRB ALP CBT-2, in simple, clear, and exam-focused language.
Failing Part-B = complete disqualification, even if Part-A score is high.
Yes.
If you have selected Diesel Mechanic trade, then Part-B (Diesel Mechanics) is mandatory and qualifying.
Not clearing Diesel Mechanics = final rejection.
Exactly 75 questions, all from Diesel Mechanics trade syllabus.
| Section | Questions |
|---|---|
| Diesel Mechanics (Part-B) | 75 |
The difficulty level is generally:
Easy to Moderate
Concept-based
Mostly direct questions
Questions are not tricky; they test basic diesel engine understanding.
Yes. 100%.
The RRB ALP Diesel Mechanics syllabus is fully based on ITI Diesel Mechanic trade, including:
Engine systems
Fuel injection
Cooling & lubrication
Defects & maintenance
No extra diploma-level depth is required.
| Topic | Importance |
|---|---|
| Fuel Injection System | ⭐⭐⭐⭐⭐ |
| Engine Components | ⭐⭐⭐⭐ |
| Cooling & Lubrication | ⭐⭐⭐⭐ |
| Defects & Troubleshooting | ⭐⭐⭐⭐ |
| IC Engine Cycles | ⭐⭐⭐ |
These topics alone can fetch 35–40 marks.
Very few.
Mostly limited to:
Thermal efficiency
Basic power concept
Simple ratios
90% questions are theory + concept based.
Extremely important.
RRB:
Repeats same concepts
Slightly changes question language
Studying PYQs increases selection probability drastically.
Minimum recommendation:
| Type | Count |
|---|---|
| Topic-wise PYQs | 250–300 |
| Practice MCQs | 400–500 |
Quality matters more than quantity.
While cut-off is not officially declared for Part-B:
| Accuracy | Safe Attempts |
|---|---|
| 85–90% | 65–70 questions |
| Target Marks | 55–60 / 75 |
Aim for accuracy over blind attempts.
Yes.
| Condition | Marks |
|---|---|
| Correct Answer | +1 |
| Wrong Answer | −⅓ |
| Unattempted | 0 |
Avoid guessing blindly.
Yes, very frequently.
Common diagram-based areas:
Fuel injection system
Cooling system
Engine components
Turbocharger
Understanding diagrams is mandatory.
| Symptom | Cause |
|---|---|
| Black smoke | Excess fuel |
| White smoke | Water / cold engine |
| Blue smoke | Oil burning |
| Engine knocking | Improper combustion |
| Overheating | Cooling failure |
Very high scoring area.
Yes, if you:
Follow ITI syllabus
Study PYQs topic-wise
Practice MCQs regularly
✔ Coaching helps with speed, but self-study is enough.
Ideal preparation time:
| Stage | Time |
|---|---|
| Concept study | 2 hours |
| MCQ practice | 1–1.5 hours |
| Revision | 30 minutes |
⏱️ Total: 3.5–4 hours/day
❌ Ignoring Part-B thinking it’s qualifying only
❌ Skipping defect & troubleshooting topics
❌ Studying theory without MCQs
❌ Avoiding diagrams
❌ Not revising PYQs
✔ These mistakes lead to failure despite hard work.
| Question | Answer |
|---|---|
| Total Questions | 75 |
| Difficulty | Easy–Moderate |
| Most Important Topic | Fuel Injection |
| PYQs Useful? | Yes (Very High) |
| Numerical Questions | Very Few |
| Safe Score | 55–60 |
Diesel Mechanics is not difficult — it’s predictable.
✔ Syllabus is fixed
✔ Topics repeat
✔ Questions are direct
✔ PYQs give clear direction
✔ If you clear your doubts using these FAQs and prepare accordingly, RRB ALP CBT-2 becomes achievable.
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