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Q1. (a) Sketch a Stress/Strain curve for a mild steel test specimen. (2)

(b) With reference to the curve sketched in part (a), explain EACH of the following:

(i) modulus of elasticity; (2)            (ii) percentage elongation; (2)

(iii) ultimate tensile stress; (2)        (iv) yield stress. (2)

Q2. Explain EACH of the following metallurgical process

(a) Induction hardening (3)             (b) Nitriding (3)        (c) Case hardening (4)

Q3. (A) Explain EACH of the following control terms

(i) Proportional action (2)     (ii) Integral action (2)

(B) Describe, with the aid of a sketch, a control system that may be enhanced by the inclusion of a cascade control. (6)

Q3. With reference to vessels fitted with podded propulsion systems capable of being rotated through 360°:

(a) state the advantages claimed over conventional shafting and steering arrangements; (6)

(b) state, with reasons, the type of vessels that are most suited to this means of propulsion. (4)

Q5. Describe the principle of operation of a biological sewage treatment plant. (4)

(b) Explain how anaerobic conditions can occur within a sewage treatment plant, stating the hazards that may be encountered. (4)

(C) Explain the meaning and significance of the term biological oxygen demand (2)

Q6. With reference to ships air conditioning plant:

(a) Define the term comfort zone (2)

(b) State the objectives of maintaining the conditioned air within the comfort zone (3)

(c) State, with reasons, FIVE areas from which the conditioned air must not be recirculated. (5)

Q8. During bunkering operations, a section of deck bunker line starts leaking fuel oil from a pinhole at the mid-section of the pipe.

(a) As Chief Engineer Officer, state the immediate actions to be taken to avoid a potential pollution incident; (4)

(b) Explain how a permanent repair could be made, stating any precautions to be taken and any further inspections that would be required. (6)

Q8.  With reference to fixed machinery space firefighting system which use water in the form of fog or mist, explain EACH of the following.

(a) How the fire is contained and extinguished (4)

(b) The importance of particle size and flow rate (4)

(c) The routine testing to be carried (2)