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Q9. (a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

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)

Q5. (a) State why the presence of oil in boiler water is considered serious. (4)

(b) Suggest likely sources of oil contamination. (4)

(c) Describe how the source is traced. (4)

(d) Describe how the whole steam plant is restored to oil free conditions. (4)

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)

Q2. (a) What are the causes of an uptake fire? (6)

(b) State the conditions under which light soot fire, intensifies to a high temperature fire in boiler uptake. What temperatures are produced in each case. (6)

(c) How boiler uptake fire is controlled? Why the use of soot blowers is prohibited? (8)

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

Q4. Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (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)

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)

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)

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)

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)