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Q5. With regard to keeping the gas side of boilers in good condition,

Discuss EACH of the following.

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

2. Oil fuel treatment (5)

3. Soot removal equipment (5)

Q1. (a) With reference to auxiliary boiler safety valves: (10)

(i) Describe, with the aid of a sketch, the safety valve for an auxiliary boiler.

(ii) Identify, with reasons, the parts that particularly require close attention during

overhaul.

(b) Describe the duties of a watch keeper with respect to a running boiler. (6)

Q9. Make a diagrammatic sketch of an exhaust gas boiler. Describe its construction and explain how it is maintained in an efficient condition. (16)

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)

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) 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)

Q8. With reference to auxiliary boiler safety valves:

a) Describe how the valves are set to lift at the desired pressure under steam. (6)

b) Describe the precautions to be taken to ensure that the valve cannot be tampered with after setting is completed. (5)

c) Briefly discuss accumulation of pressure test. (5)