DieselShip's Online Content Library

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. (a) State, with reasons, the control actions that may be suitable for EACH of the following processes:

(i) settling tank oil temperature; (2)

(ii) jacket water temperature; (2)

(iii) temperature of oil being purified. (2)

(b) Sketch a block diagram of ONE of the control circuits for ONE of the processes in part (a). (4)

Q3. With reference to podded thrusters for main propulsion:

(a) distinguish between podded and azimuthing thrusters; (4)

(b) explain the meaning of thruster and tractor propellers, stating ONE advantage of tractor units; (4)

(c) explain what is meant by tandem podded thrusters. (2)

Q4.  Describe in detail the operation, maintenance and monitoring of a bilge water processing unit to ensure compliance with the current MARPOL convention on the discharge of oily bilge water.(10)

Q5. (a) Describe the operation of a vacuum sewage system. (5)

(b) List the advantages of a vacuum sewage system when compared to a conventional flushing system. (4)

(c) State why untreated sewage should not be allowed to stagnate. (1)

Q6. (a) Describe, with the aid of a sketch, a constant speed, uni-directional, axial flow pump suitable for hydraulic applications. (6)

(b) Explain, with the aid of a sketch, how the axial flow pump can achieve higher pressures than its radial flow counterpart. (4)

Q7. With reference to ships air conditioning plants:

(a) State the temperatures and relative humidities at EACH of the points that are regarded as the boundaries of the comfort zone. (2)

(b) Explain how the temperatures and relative humidities could be maintained within the comfort zone when the ship is in EACH of the following locations:

(i) North West Europe in winter. (2)

(ii) Arabian Gulf in summer. (2)

(c) State with reasons FOUR locations within the accommodation that conditioned air must not be recirculated. (4)

Q8. With reference to fixed CO2 smothering systems for ships machinery spaces:

(a) State the safety procedure that the Chief Engineer Officer should adopt with respect

to maintenance being carried out on the system by contractors whilst the vessel is in port. (3)

(b) State the procedure prior to the safe release of CO2 into the machinery space in the event of a fire. (4)

(c) Describe the factors that should be considered prior to re-entry of the machinery spaces after the release of CO2 gas. (3)