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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. Discuss the advantages and disadvantages of electrical remote monitoring and control systems compared to pneumatic systems. (10)

Q3. With reference to main propulsion shaft systems:

(a) describe a method of hydraulic jacking to check bearing loads; (5)

(b) sketch the Bearing Load versus Shift Lift Dial Gauge Reading graph obtained by the method described in part (a), annotating the graph and how the characteristic of bearing load is obtained. (5)

Q4. With reference to plate type heat exchangers:

(a) sketch a cross sectional view showing the plate design pattern and the directions of hot and cold fluid flow; (4)

(b) state TWO reasons for the plate design patterns; (2)

(c) state, with reasons, FOUR advantages of a plate cooler compared to shell and tube type. (4)

Q5. with reference to centrifugal pumps;

(a) describe how EACH of the following improves pump performance:

??(i)raising the speed of rotation;??(2)

??(ii) multi-staging.??(2)

(b) explain the advantages of using centrifugal pumps instead of positive displacement pumps for lubricating oil circulating duties.??(6)

Q5. (a) State the regulations pertaining to the main and auxiliary steering gear with reference to EACH of the following:

(i) rudder angle and time of operation;(2)

(ii) electrical supply. (3)

(b) With reference to a hydraulic steering gear, explain EACH of the following:

(i) the factors that may contribute to the failure of a hydraulic pipe coupling; (2)

(ii) what is meant by the single failure concept. (3)

Q7. In a vapour compression refrigeration system, state how EACH of the following faults are indicated and how they are remedied:

(a) air in the refrigerant; (2)

(b) oil in the refrigerant; (2)

(c) Moisture in the refrigerant; (2)

(d) undercharge of the refrigerant; (2)

(e) overcharge of the refrigerant; (2)

Q7. As Chief Engineer Officer, prepare standing orders for working with gas cutting and gas welding equipment, including the storage of spare bottles. (10)