Q9. Sketch and describe the refrigeration system of a container carrying bananas only. How does the controlled atmosphere of the container extend the green life and shelf life of bananas? How is the airflow system designed?
Q1. You have been appointed as the Second Engineer of an eight years old vessel, recently purchased by your shipping company. Write a report to the engineering superintendent covering the inspection of main propulsion machinery carried out by you, to ensure its trouble free operation.
Q4. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down;
B. State how the vanes described in (A) are secured and the method of sealing the edges;
C. State how, if necessary, the steering gear is locked for rudder maintenance.
Q2. Cast iron is most widely used metal after steel in Marine Engineering. Most cast irons consist of graphite in steel like matrix. Discuss the variation of properties that may arise with reference to pearlitic grey cast iron and spherical grey cast iron. Describe briefly the treatment necessary to produce these two types of Irons.
Q9. Reverse osmosis is one of the alternative method for shipboard production of drinking water.
(a) Describe using simple diagrams if necessary, the principle of reverse osmosis.
(b) (i) Sketch a line diagram showing a single pass system for producing fresh water from sea water
(ii) Describe such a system.
Q7. With reference to Gear pumps used for lubricating oil transfer.
(a) Sketch and describe a gear type pump indicating the flow of fluid.
(b) state the materials that gear type pump components may be manufactured from.
(c) specify THREE applications that are suitable for the employment of gear type pumps.
Q8. With reference to Air-conditioning system onboard your vessel:
(a) Sketch and describe high pressure cut-out in a refrigeration system.
(b) The refrigeration compressor has stopped due to operation of the h.p cut-out Explain.
(i) The possible cause.
(ii) How these causes would be found and possible remedies.
(c) What steps are taken if the compressor “short-cycle” on low pressure cut-out?
Q2. With reference to Flue gas Inert gas system:
A. Sketch a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers, labelling the component parts.
B. Describe the system.
C. State what oxygen content you would expect in the flue gases if good combustion is achieved.
Q7. With reference to auxiliary boiler safety valve:
A. Describe, with aid of a Sketch the safety valves for an auxiliary boiler;
B. Identify, with reasons, the part that require particularly close attention during overhaul;
C. Describe how the safety valves are reset after an overhaul.
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