QUESTION BANK MARINE ENGINEERING PRACTICE PART-3

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830

Q With reference to air receivers and bottles explain with reasons:

a) Why regular systematic internal inspection is advisable?

b) Which internal areas of the large receivers should receive particularly close examination?

c) How bottles are inspected internally and what parts should be closely examined?

d) How the condition of the bottle or receiver that cannot be inspected internally is checked?

Q With reference to reciprocating air compressors explain the cause of the following faults & steps taken for their prevention:

a) Collapse of discharge valve springs.

b) Breakage of plate valves.

c) Overheating of the discharge air with an unrestricted air intake.

d) Inoperative piston rings.

Q Describe an air receiver and explain clearly the purpose of the mounting. State the defects which may develop and explain the precaution which should be taken to minimize the possibility of deterioration or damage of air receiver?

Q a) Discuss the possible problems associated with air compressors which operate automatically.

b) State the standing orders you, as a 2/E, would issue regarding the maintenance & safe & efficient operation of the air compressors.

c) Outline any problems common to the air receivers & machinery space/ship compressed air systems.

Q a) Explain how oil carries over occurs in starting air compressors?

b) State, how the problems of the oil carry over are minimized?

c) State 3 factors that contribute to the air start line explosions in diesel engines?

Q You have recently been appointed second engineer of a vessel and have experienced problems associated with the operation of the oily water separator. Write a letter explaining the nature of the problem and suggesting possible remedies. Assume a slop tank is available for retaining the bilges until the vessel reaches port.

Q You have been appointed as the Second Engineer of an old vessel which is in the drydock & recently been purchased by your shipping company. Describe in a letter to the superintendent, your inspection to assure that the conditions of assignment of the load line are satisfactory complied with.

Q Write a report to your Engineer Superintendent describing a breakdown of the main refrigerating plant for the cargo or ship provision giving reasons for the breakdown, the method of the repair & the action taken to prevent a recurrence.

Q During the past 4 months since you joined the ship as 2/E a number of the main engine exhaust valves have suffered tracking & corrosion at the seating faces. Write a report to the Superintendent Engineer covering the following points:

a) An explanation detailing how the problem becomes evident.’

b) Your action upon recognizing the extent & seriousness of the problem.

c) Your reasoned views regarding the possible causes of the problem.

d) Your suggestions to avoid future incidents.

Q Assume you are instructed to submit to the Superintendent Engineer a complete set of indicator cards together with relevant data. Give full account of your work in taking the cards and preparing them for submission. Tabulate the data you forward, both that extracted from the cards and otherwise obtained, giving typical figures taken from a large 2 stoke slow speed main propulsion unit.

Q Write a report to your company’s Superintendent Engineer outlining the breakdown of the diesel generator engine & suggest remedial measures to avert a recurrence of the similar trouble.

Q You have recently joined a vessel as Second Engineer Officer. For the past several voyages it has been the practice on board to dispense with the use of the exhaust gas boiler & leave it to run dry. As part of an overall economy drive the company has requested you to re-commission the boiler. Write a letter to the Superintendent Engineer stating how the boiler was brought on line & the safety valves adjusted.

Q a) The UMS monitoring and control system of your ship has recently started to give false alarms & incorrect data printouts. State, with the reasons, possible causes if the false alarms and reading are:

i. Localized to a particular area of the engine operation

ii. General to the engine room

b) State, with reasons, the action you, as 2/E, would take to assure continued safe operation of the vessel if the defects are general to the engine room

c) Explain the procedure you, as 2/E, would adopt in order to locate & rectify a general fault in the UMS system.

Q You have recently been appointed second engineer of a vessel and have experienced problems associated with the operation of the oily water separator. Write a letter explaining the nature of the problem and suggesting possible remedies. Assume a slop tank is available for retaining the bilges until the vessel reaches port.

Q You have been appointed as the Second Engineer of an old vessel which is in the drydock & recently been purchased by your shipping company. Describe in a letter to the superintendent, your inspection to assure that the conditions of assignment of the load line are satisfactory complied with.

Q Write a report to your Engineer Superintendent describing a breakdown of the main refrigerating plant for the cargo or ship provision giving reasons for the breakdown, the method of the repair & the action taken to prevent a recurrence.

Q During the past 4 months since you joined the ship as 2/E a number of the main engine exhaust valves have suffered tracking & corrosion at the seating faces. Write a report to the Superintendent Engineer covering the following points:

a) An explanation detailing how the problem becomes evident.’

b) Your action upon recognizing the extent & seriousness of the problem.

c) Your reasoned views regarding the possible causes of the problem.

d) Your suggestions to avoid future incidents.

Q Assume you are instructed to submit to the Superintendent Engineer a complete set of indicator cards together with relevant data. Give full account of your work in taking the cards and preparing them for submission. Tabulate the data you forward, both that extracted from the cards and otherwise obtained, giving typical figures taken from a large 2 stoke slow speed main propulsion unit.

Q Write a report to your company’s Superintendent Engineer outlining the breakdown of the diesel generator engine & suggest remedial measures to avert a recurrence of the similar trouble.

Q You have recently joined a vessel as Second Engineer Officer. For the past several voyages it has been the practice on board to dispense with the use of the exhaust gas boiler & leave it to run dry. As part of an overall economy drive the company has requested you to re-commission the boiler. Write a letter to the Superintendent Engineer stating how the boiler was brought on line & the safety valves adjusted.

Q a) The UMS monitoring and control system of your ship has recently started to give false alarms & incorrect data printouts. State, with the reasons, possible causes if the false alarms and reading are:

i. Localized to a particular area of the engine operation

ii. General to the engine room

b) State, with reasons, the action you, as 2/E, would take to assure continued safe operation of the vessel if the defects are general to the engine room

c) Explain the procedure you, as 2/E, would adopt in order to locate & rectify a general fault in the UMS system.

Q Fatigue is one of the main causes of crankshaft failure:

a) Indicate on a figure the most likely location of a fatigue crack.

b) Explain how a fatigue failure is identified.

c) Describe how the fatigue crack may be initiated.

d) Describe, with the help of sketches, the methods used to inhibit fatigue cracks.

Q Explain how each of the following hull defects should be dealt with;

a) A cracked weld.

b) A severe indentation in way of the frame.

c) Surfaces suffering from the general corrosion although the extent of wastage does not warrant plate replacement.

d) A bilge keel fractured at forward end.

Q Give 3 reasons why cracks occasionally develop in large piston crown. State to what extent this cracking is considered of consequence. State how it is dealt with in the following instances:

a) Fine hairline

b) Localised & shallow crack

c) Extensive & deep crack

Q Write short note on the followings:

a) Metal-locking

b) TIG & MIG welding

c) Brazing

d) Soldering

Q A rudder of a vessel requires extensive welding repairs & as 2/E you are requested to supervise:

a) Suggest a suitable type of the welding process.

b) State, with reasons, 4 common welding defects.

c) State what tests may be carried out before returning the rudder to the service.

Q Give a reasoned opinion if you would repair by cropping, building up or renewing on the following:

a) Deck stringer with the localized pitting

b) Plating below scupper above waterline

c) Plating at waterline.

Q Describe why the best way repairs would be made by way of:

a) Building by weld

b) Cropping or

c) Installing new plate for the following

i. Puncture in a hollow rudder

ii. Part of the bilge keel torn away from the hull

d) A puncture of a large area of the plate bulkhead near the bow under the hawse pipe.

Q Describe briefly the methods of carrying out a bend test and an impact test illustrate their general form of the test pieces used & state how the final results are given for compression of the different materials of what practical use are the figures obtained?

Q What short notes on the following:

a) Measures to stop the exhaust gas leakage in the engine room.

b) Measures to stop oil leakages in the E/R.

c) Measures to take for the proper ventilation of engine room/purifier room.

Q Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil at outlet of the cooler and:-

a) Explain why air supplied to a pneumatic control system must be free from the dust & water.

b) Describe how above impurities are removed.

c) State the possible significance if the air supply is contaminated

Q With reference to ILO notices on the health hazards from asbestos.

a) State where asbestos may be found on board ships.

b) State the health risks from the asbestos.

c) Outline the precautions required to minimize exposure to the asbestos during an emergency repair.

Q A biological sewage system develops a fault, which necessitates opening the unit for the repair.

a) The risk associated with the opening the unit.

b) The precaution taken to minimize the risk.

c) Explain the significance of the biological oxygen demand (B.O.D.)

Q Describe systematically, how a vessel which had a black-out on full ahead is restored to full sea steaming conditions.

Q On arrival port after a passage, following repairs are to be carried out. Prepare the specifications for the workshop on:-

a) Deck seal of an IG system used in an oil tanker.

b) Main Engine cooling sea water Overboard valve.

c) Aft winch hydraulic oil pressure line, holed at deck penetration in the Steering Compartment.

Q A ship is engaged in filling the double bottom and deep tanks with fuel. Explain and describe:

a) The dangers implicit in the operation.

b) The precautions that should be observed.

c) Legal requirements that must be adhered to.

Q Any proposal to operate a machinery spaces in the periodically UMS condition must take into account the danger of fire, flooding & failure of the surveillance equipment. Describe how possibility of the latter two hazards may be minimised detected & bought to the attention of watch keeper.

Q A several year old ship has been laid up for some time & is to be re-commissioned. State the salient areas/items you will need to pay attention to. What are the common defects you are likely to encounter?

Q Referring where necessary to design, construction and operation outline the measures to prevent fires caused by spillage of the fuel, lubricating & hydraulic oil, involving each of the following:

a) Pipes, fliers, valves & cocks

b) Oil units, pumps & fittings

c) Overflow arrangements

d) Sounding arrangements

e) Lubricating oil

f) Starting air pipe lines

g) Electric cables.

Q a) Explain 2 advantages & TWO disadvantages of producing fresh water using reverse osmosis.

b) Discuss the maintenance needed for the following process.

i. Osmosis

ii. Reverse osmosis

Q State why each of the following is considered a good practice:

a) Regular check on the diesel engine cooling water condition.

b) Main air reservoir drained regularly.

c) Putting a cap & self-closing cock on engine room D.B. tank.

d) Indicator cocks be left open on the stationary marine diesel engine.

Q The lube oil cooler of a large 2 stroke diesel engine is showing poor performance. Suggest some measures you would initiate to rectify the problem and improve the performance.

Q If you have opened up a main sea-water circulating pump for the survey or examination, describe the checks you would make, & state your conclusion regarding any faults found in:

i. Operational faults

ii. Maintenance irregularities

Q A single forged shaft for a small gear pump is broken in the middle. Suggest some emergency repairs to the shaft to enable run the pump. State the type of the repair & procedure for carrying out the repair. What is the most viable alternative to repair if no spares are available?

Q a) Explain the causes of severe erosion that may be experienced in a centrifugal Pump.

b) State how pump performance is affected and possible indications to the shipboard engineer.

c) Explain how the erosion can be minimized by use of the proper operation, material and installation.

Q Explain how each of the following conditions contributes to the satisfactory performance of oil centrifuges:

a) Correct bowl speed

b) Cleanliness of bowl

c) Low rate of feed to the bowl

d) Contaminated oil preheated prior to centrifuging

e) Contaminated oil allowed standing for an appreciable time prior to centrifuging.

Q A L.O/H.F.O purifier vibrates badly when just shutting down and coming to a stop. Suggest some reason for this vibration problem, when you have already made an inspection of its drive mechanism & casing and found nothing unusual.

Q With reference to oil monitoring of bilge and tanker ballast discharges:

a) Describe the maintenance schedules & procedures for an oil monitoring system.

b) State the inputs that are recorded.

c) Explain the difficulties encountered with the efficient operation of the oil monitoring system.