DieselShip's Online Content Library

Q1) (a) Using a line diagram, show the arrangement of ‘emergency bilge suction’ for a general cargo ship (8)

(b) State the purpose of ‘bilge injection valve’ and to which pump or pumps it is connected. Give reasons. (4)

(c) State requirements with respect to the dimensions of the bilge injection valve and the main sea suction valve on the sea chest. (4)

Q2) (a) What are the advantages and disadvantages of the single-coil type and the straight-tube type of inter-cooler for air compressor? (10)

(b) Why are the tubes and coils generally made of copper? (6)

Q3) (a) With the aid of a sketch describe the working of a shell and tube type freshwater generator. (10)

(b) What are the probable causes of fluctuating and unsteady vacuum in such an evaporator and what would be the consequence of such an unsteady vacuum? (6)

Q4) (a) Make a detailed sketch of a Ship's domestic refrigeration system. (8)

(b) Give a full description of such a Refrigeration System, explaining the purpose of the relevant control and safety devices. (8)

Q5) (a) In the context of auxiliary boiler. Explain what do you understand by the term ‘foaming’. List the measures you would consider to prevent it? Is it different from ‘priming’ in the auxiliary boiler context? (6)

(b) Explain any one of the following with a sketch. (6)

(i) Composite boiler

(ii) Exhaust gas economiser

(c) What is the significance of ‘de-aeration’ of the boiler water? How is it achieved and what are the effects if ignored? (4)

Q6) Write short notes to explain the following fittings/devices used in engine room, and their applications: (16)

(a) Low sea suction

(b) Fretting corrosion

(c) Caustic embrittlement

(d) Air starting motor

Q7) (a) Sketch a four-ram steering gear arrangement capable of 100% redundancy. (8)

(b) Describe the operation of the arrangement sketched in (a). (8)

Q8) a) Sketch a line diagram showing a typical “Inert Gas System used for inerting the cargo tanks of oil tankers, labelling the components parts. (6)

b) Describe the system. (8)

c) State what oxygen content you would expect in the flue gases if good combustion achieved (2)

Q9) (a) Sketch a nozzle/flapper device used for the generation of a pneumatic signal, labelling the component parts (10)

(b) Describe the operation of the device in (a) above (6)