Repeated questions asked in MEO class IV exams

Oral question bank for class IV examination.

Function 4B:

Fridge compressor

1. What is meant by 1 ton of refrigerant?
2. Why is fridge compressor belt driven?
3. Is there a difference between lube oil pressure readings of fridge compressor when compared to air compressor?
4. How can you read the lube oil pressure of fridge compressor?
5. When pressure guage is also availed with temperature reading? What is use of this?
6. How is temperature of cold room maintained?
7. What is the role of Thermostatic expansion valve?

Boiler

1. Why boiler water treatment is required?
2. What is the allowed chloride content of boiler water?
3. Why is boiler water circulating pump required for exhaust gas boiler (EGB).
4. How does bourbon pressure guage work?
5. How do you blow through a boiler guage glass?
6. How do you tighten a guage glass after assembly?
7. What is the setting of boiler safety valve?
8. What is normally allowed chloride content in water tube boiler?
9. How do you blow down a boiler and inspect boiler after it?
10. Why do you pre purge boiler before starting the boiler?
11. What type of boiler burner was used in your last ship?
12. What is the voltage used in the ignitor of boiler burner?
13. How will you know exhaust gas boiler (EGB) is leaking?
14. How will you stop a exhaust gas boiler from leaking?
15. What is purpose of soot blowing?
16. When do you start circulating pump?
17. What is the temperature of steam when steam is in boiler?
18. What is meant by superheated steam?
19. How is boiler safety valve set?
20. What is the setting of boiler safety valve?
21. What is meant by accumulation pressure test?
22. What is the safety mechanism in case the guage glass breaks?
23. Which part of ship boiler has higher safety setting (EGB) or (auxillary boiler)?

Air compressors

1. Why bursting disc is provided in air compressor?
2. Where will you find bursting disc in air compressor?
3. If bursting disc ruptures what will be your action?
4. What are safeties fitted on air compressors?
5. If the interstage relief valve is lifting what could be the reasons?
6. Why is multi stage compressor used on board?
7. How will you test the working of compressor safety valve?