The following questions came from candidates right after they had finished their oral exam.
MAINTENANCE AND REPAIR AT OPERATIONAL LEVEL (MROL)
ENGINE COMPONENTS
| 1. | What is tappet clearance? How to take tappet clearance? |
| 2. | What will happen if tappet clearance is less or more? |
| 3. | Explain the procedure of removal of liner in main engine and auxiliary engine. |
| 4. | How to lock the liner at the time of taking out piston from the unit in auxiliary engine? |
| 5. | Explain the procedure of removal of piston in main engine and auxiliary engine. |
| 6. | Explain the procedure of removal of cylinder head of main engine. |
| 7. | How to check AE compression pressure? |
| 8. | How to identify inlet valve and exhaust valve of an AE ? |
| 9. | How inlet valve and exhaust valve lapping is done? |
| 10. | How shall you carry out auxiliary engine cylinder head pressure test? |
AIR COMPRESSOR
| 1. | Why we can’t use single stage air compressor and also explain P-V diagram of it? |
| 2. | Why we use multistage air compressor and what is the importance of it? Why cylinder diameter of compressor decreases after every stage? |
| 3. | What are different trips/ alarm present in air compressor? |
| 4. | What is the location of relief valve, bursting disc and fusible plug? |
| 5. | What is the purpose of unloader valve? |
| 6. | What would be the affect of suction valve having too much lift? |
| 7. | What is the use of intercooler and after cooler in compressor? |
| 8. | How to start air compressors manually on ships? |
| 9. | What is emergency air compressor? Its purpose and regulation? |
| 10. | How do you check compressor efficiency during running? |
| 11. | What are the safeties on air bottle? |
| 12. | What are the mountings on air bottle? |
| 13. | Explain air bottle entry procedure. |
| 14. | What action should be taken in case of corrosion / wasting observed on air bottle? |
| 15. | What would be the affect of suction valve of an air compressor having too much lift? |
| 16. | Air compressor efficiency drops. What may be the reasons? |
| 17. | What are different types of corrosion in air bottle and its effect? |
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