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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) Sketch a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers, labelling the component parts. (6)

(b) Describe the system. (8)

(c) State what oxygen content you would expect in the flue gases if good combustion is achieved. (2)

Q3. Outline the measures to prevent fires caused by spillage of fuel, lubricating and hydraulic oil, involving EACH of the following:

(a) Pipes, filters, valves and cocks; (2)

(b) Oil units; (2)

(c) Overflow arrangements; (2)

(d) Sounding arrangements: (2)

(e) Thermometer fittings; (2)

(f) Pumps and fittings; (2)

(g) Electric cables; (2)

(h) Exhaust turnings. (2)

Q4. (a) Describe with aid of a line diagram the layout and components of a hydraulic system suitable for the operation of deck machinery; (8)

(b) Explain how the hydraulic system pressure is controlled assuming the use of a variable  Delivery pump. (4)

c) State which design of hydraulic motor is used in the system described in (b) (4)

Q1. With reference to control system state what is meant by

a) Two step action. (6)

b) Proportional control. (5)

c) Offset. (5)

Q6. Explain why each of the following features is considered desirable for air compressors:

(a) A single-throw crank for a multi-stage compressor; (4)

(b) Minimum clearance volume· (4)

(c) Multi tubular inter-stage cooler; (4)

(d) Generous size of suction filter.  (4)

Q7. (a) Describe each of following: (8)

(i) Work hardening

(ii) Nitriding

(iii) Cold working

(iv) Normalising

(b) With reference to the component parts of shipboard machinery and equipment, state with reason, One example of where EACH of (a), (i) (ii), (iii) and (iv) may be used. (8)

Q8. (a) Sketch a steering gear arrangement capable of I00 percent redundancy. (8)

(b) Describe the operation of the arrangement in (a) when the working pump oil manifold develops a serious leak. (8)

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