DieselShip's Online Content Library

Q1) (a) With a line diagram, explain the working of the Quick Closing Valve? (8)

(b) Why do you need the Quick Closing Valves on the fuel and lube oil lines? (3)

(c) Explain how to reset the valve after a trial. How is the periodic test carried out and what are the areas of concern that need special attention. (5)

Q6. (a) Describe the constructional features of plate type freshwater generator and its operational procedures for fresh water generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q3) (a) With a diagram of the lubricating oil line, explain the working of an automatic backflushing filter placed on the lubricating oil line of the main engine. (10)

(b) List the main difference between such filter and a centrifugal separator. (6)

Q4) (a) Describe TWO methods of tracing a superficial crack in a casting used as an engine component. (8)

(b) Explain how propagation of a crack in a machinery component can be arrested. (8)

Q5. (a) How is the tensile strength of a metal determined? What other information is obtained when a tensile test is made? (8)

(b) Name the non-destructive tests used during the manufacture and service of a diesel engine components and associated equipments. Give an example of where each test is used. (8)

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

(a) Gear pump (5)

(b) Priming pump of Emergency fire pump (5)

(c) PID controller (6)

Q7) With reference to main air reservoirs:

(a) Explain with line sketch the manner in which mountings are attached to the shell (6)

(b) Explain why regular internal inspection is advisable (4)

(c) What are the areas that need particular attention during the inspection and survey of a main air reservoir. (6)

Q8) With regard to the carriage of crude oil and its associated products:

(a) Sketch an explosimeter suitable for testing pump rooms or tanks, and give a brief description of the operation of this explosimeter (10)

(b) What periodic maintenance or checks are carried out on the P-V Breaker fitted on a tanker ship? (6)

Q9) Explain the following:

(a) Control air dryer - working principle with diagram, of any one type of dryer of your choice (8)

(b) Any two types of Ballast water treatment system (8)

Q7.  i) Using a line diagram, show the arrangement of ‘emergency bilge suction’ for a general cargo ship. (8)

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

iii) State requirements with respect to the diameter of bilge injection valve and main sea suction valve on 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) Describe the effects of taking fresh water from the shore as feedwater for auxiliary boilers. (5)

(b) Describe the measures taken to reduce these effects. (5)

(c) What is the purpose of deaerator in the boiler feed water system? How is the deaeration achieved? (6)

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)

Q2.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)