DieselShip's Online Content Library

Q1. (a) State the factors in the storage of welding electrodes which will assist in producing good quality welds. (2)

(b) Explain the importance of edge preparation before welding. (2)

(c) Sketch TWO methods of plate edge preparation. (2)

(d) A hairline crack is detected in a pipe, as Chief Engineer Officer, state the factors to be taken into account in reaching a decision on the method of repair. (4)

Q2. (a) Sketch an outboard radial lip seal as fitted to an oil lubricated stem tube. (5)

(b) Explain the procedure for replacing the seal sketched in part (a) without removing the tail shaft. (5)

Q3. With reference to static oily water separators, explain EACH of the following:

(a) why the supply pump should be carefully selected and matched to the separator; (2)

(b) how the separator achieves effective separation; (4)

(c) how the physical properties of each of the fluids to be separated affects the rate and effectiveness of separation. (4)

Q4.With reference to ships' air conditioning systems:(a) state the effects of EACH of the following faults:

(i) corroded return air trunkings; (2)          (ii) blocked evaporator drains; (2)

(iii) defective capacity control. (2)

(b) state the main health hazard that may arise in the air conditioning plant, stating the conditions that need to arise and the measures that should be taken to prevent this occurring. (4)

Q5. Describe, with the aid of a sketch, the principle of operation of a capacitance electrode level measuring transmitter. (10)

Q6. With reference to fuel with high pour point:

(a) describe test that may be carried out;(4)

(b) state the measure to be taken to enable the ship to use the fuel.(6)

Q7. With reference to automatic sprinkler systems for fire fighting purposes:

(a) explain, with the aid of a Heat Release versus Time diagram, the difference between fire control and fire suppression; (6)

(b) state the limitations of using glass bulbs to activate sprinkler heads and suggest, with reasons, an alternative mechanism. (4)

Q8. (a) State THREE modes of heat transfer. (1)

(b)Describe how the design requirements of EACH of the following are met, detailing the materials used to promote or retard heat transfer:

(i)plate cooler in central cooling system;(3)          (ii)meat room in domestic provisions space;(3)  (iii)auxiliary steam system pipelines. (3)

Q9. (a)Sketch a circuit diagram of a self-excited a.c. generator.(5)

(b)Describe the operation of the circuit sketched in part (a).(5)

Q10.During a complete loss of electrical power, essential vital services can be maintained by means of an Uninterruptable Power Supply (UPS).

(a)Describe, with the aid of a block diagram, the operation of an a.c. input UPS arrangement. (7)

(b)List SIX essential services that the UPS may support.  (3)

Q5. With reference to the protection of electrical equipment in a distribution system:

(a) state the aims of the protective devices; (3)

(b) list the parameters that are monitored and acted upon by the protective devices; (4)

(c) state, with reasons, THREE causes of electrical fires. (3)

Q11. With reference to electrical equipment in potentially flammable atmosphere:

(a) Explain why conventional equipment is considered hazardous (2)

(b) Explain the concept of intrinsic safety (3)

(c) Describe, with the aid of a sketch, a safety barrier for an electrical power supply (5)

Q12.Describe the in-water survey to classification society requirements of the underwater structure of a very large carrier.        (10)

Q13. Describe, with the aid of sketches, how main propulsion efficiency can be improved by the addition of EACH of the following:

(a) ducted propeller (Kort nozzle) ;(5)

(b) vane or Grim wheel aft of the propeller. (5)

Q13. (a) With reference to bilge keels:

(i) describe how the design and method of attachment reduces the possibility of damage to the shell plate; (5)

(ii) state what testing must be carried out. (2)

(b) Explain why the bilge keels do not extend the full length of the vessel. (3)