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Q2. Make a diagrammatic sketch of an exhaust gas boiler. Describe its construction and explain how it is maintained in an efficient condition (16)

Q7. With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats (5)

(b) Why the drain must be clear (5)

(c) Why opening gear should be kept in good working order at all times (6)

Q7. i) Sketch and describe a composite boiler and explain its working principle. (12)

ii) What do you understand by the term 'Heat Recovery'? Briefly explain as to how it contributes to increasing plant efficiency? (4)

Q8) (a) Describe the effects of taking fresh water from the shore as feedwater for auxiliary boilers. (5)

(b) Describe the measures taken to reduce these effects. (5)

(c) What is the purpose of deaerator in the boiler feed water system? How is the deaeration achieved? (6)

Q6. a) With help of a diagrammatic sketch describe Feed water system for the boiler. (8)

b) What is the function of the cascade tank or Hot Well? (4)

c) Why the water in the Hot well is kept heated? What is the temperature of hot well normally maintained and how? (4)

Q5. (a) What is a composite boiler? Draw diagrammatic sketch of composite boiler and name each part. (8)

(b) What are the methods used to control the temperature in the steam drum? (6)

(c) What are the advantages of having composite boiler on the ship? (2)

Q5.a) Draw diagrammatic sketch of Boiler gauge glass. Name each part and function. (8)

b) What safeties are provided on gauge glass in case of rupturing of the glass? (4)

c) Describe procedure for blow down of gauge glass. (4)

Q8. (a) Why is oil in boiler water considered dangerous? Where does it usually come from and how can it be removed? (8)

(b) Briefly describe why boiler water needs to be tested periodically and state two of the tests. (8)

Q8. (a) Describe maintenance required on auxiliary boiler burner. (8)
(b) Describe safety features provided on fuel burning system of auxiliary boiler (8)

Q3. With regard to keeping gas side of boilers in good condition discuss EACH of the following:

a) The mechanism of combustion, stating the factors which are important to good combustion. (6)

b) Oil fuel treatments. (5)

c) Soot removal equipment. (5)

Q9. a) Describe maintenance to be carried out on safety valve of Auxiliary Boiler to keep them in good order.

b) Describe procedure for setting safety valve. (6)

Q1. With reference to the treatment of water for auxiliary boilers:

(a) State the major risks from

i) Hard water. (3)

ii) soft water. (3)

(b) Describe FIVE types of boiler water tests that are carried out on board stating the reason for EACH. (5)

(c) State why regular blow down and make up of the contents of a boiler is essential. (5)