DieselShip's Online Content Library

Q2. (i) Discuss the use of non-metals onboard ships & name some of the common nonmetals used (4)

(ii) What are their areas of application on ships? (4)

(iii) Name the advantages & also the limitations in using non-ferrous materials (8)

Q8.a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions. (8)

b) State the purpose of, and describe the operation of (8)

i) hydraulic shock/buffer valves.

ii) Oil replenishing tank.

iii) Hunting gear.

Q5. Explain how each of the following, conditions contribute to the satisfactory

performance of oil centrifuges (16)

(a) correct bowl speed

(b) cleanliness of bowl

(c) low rate of feed to bowl

(d) Contaminated oil allowed to stand for an appreciable time prior to centrifuging.

Q4) Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve (16)

Q5) With regard to a reciprocating refrigerator compressor.

(a) Sketch the mechanical shaft seal showing its component parts and how it is lubricated (8)

(b) Describe the sealing arrangement stating the materials used for the component parts (4)

(c) State the effect on the environment of the release of refrigerants into the atmosphere (4)

Q6) (a) Sketch an auxiliary boiler ‘blow down’ valve. Explain how it differs from its shipside counterpart (10)

(b) Describe the sequence of ‘blow down’ procedure (6)

Q7) Submit a report to the Chief Engineer stating how the freshwater generator output on board you ship was increased to near optimal values. The report should specifically mention the adjustments, corrections and improvements executed (16)

Q6. i) Sketch and describe a fuel system diagram for a 2 stroke Marine diesel engine from storage / service tank to fuel injectors.  Show the various components and fittings which are provided in the circuit. What is the purpose of mixing columns & autodeaerating valve? (16)

Q9. a) Bunkering as a shipboard operation has its own significance. List out the important inspects of a bunkering operation including the preparation and precaution to be taken to ensure a safe operation. (8)

b) What does the Bunker specification include and how does it affect the engines adversely? Name at least three such ingredients that you expect in a Heavy Fuel Oil bunker and the effects on the engine operation. (8)

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)

Q7. State the causes and remedial actions to be taken in case of the following occurring on an air compressor:

(a) Water mixed in the crankcase oil (4)

(b) LP safety valve blowing (4)

(c) Bursting disc rupture (4)

(d) Problems caused by detective piston rings (4)

Q3. (a) Sketch a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers, labelling the component parts (8)

(b) Describe the system (8)

Q4. A distinguishing feature of an eductor, when compared to other pumps, is the (16)

(a) Discharge end being smaller than the suction end

(b) Small size of impeller

(c) Lack of moving parts

(d) Ease at which the wearing rings may be changed

Briefly justify your answer.

Q4. a) Whils't on ‘seawatch’ you observe that the Oil Mist detector (OMD) in the engine room has triggered an alarm, and in feeling the crankcase doors on the bottom platform, you find that the unit in question feels warmer than the rest. What pre-emptive action will you take as Watch-keeper to bring the situation under control. (10)

b) Draw a simple line diagram of an ‘OMD’ and explain it’s working. (6)

Q1. With reference to control system state what is meant by

a) Two step action. (6)

b) Proportional control. (5)

c) Offset. (5)

Q3. Why Engineering Materials are tested prior manufacturing of their components.

i) Describe the various destructive and non-destructive tests carried out on materials for shipboard used. (6)

ii) Explain the purpose of each test and where the same applied. (10)

Q8. (a) Explain 'short cycling' in the context of refrigeration and air conditioning systems onboard ship. State its causes and how it can be avoided. (6)
(b) State the symptoms of 'overcharging' and 'undercharging' in refrigeration system. What are its effects and state remedial measures (5)
(c) What are the visible indicators of oil in refrigeration system. What would be its effects? State remedial measures (5)

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)