Marine Engineering Practice

(a) Describe the procedure for:

(i) Rivetting two plates. (5)

(ii) Removing a rivet from the plates. (5)

(b) What are the essential tools required for the procedure in (a) above. (6)

(a) Describe how cylinder liners are checked for wear. (5)

(b) Explain how these measurements are recorded. (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement. (6)

(a) Describe uses of compressed air onboard the ship. (6)

(b) Describe maintenance schedule of various systems on main air compressor. (6)

(c) Describe Isolation procedure of main air compressor before starting any work. (4)

(a) Describe why priming is required for a centrifugal pump. With the aid of a sketch, describe working of a primer for centrifugal pump. (10)

(b) Why balance holes are provided in the impeller? (6)

For an auxiliary engine, how can you possibly detect leaking or worn piston rings applying each of the following methods:

(a) operational monitoring

(b) performance analysis

(c) direct inspection of the cylinder (16)

Describe the procedure for the regular maintenance routines to be carried out on the various types of portable fire extinguisher on ships. (16)

With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats, (5)

(b) Why the drain must be clear, (5)

(c) Why opening gear should be kept in good working order at all times. (6)

With reference to exhaust valves of an auxiliary diesel engine

(a) Describe how valves are reconditioned (8)

(b) Explain how valve timing is checked and corrected. (8)

Describe, with the aid of neat sketches, the procedure for checking and correcting the alignment of a pump shaft coupled to its driving motor. Explain the dial gauge (rim and face) method in detail, state the acceptable tolerances, and discuss the common causes of misalignment (16)

(a) Describe the procedure for:

(i) Rivetting two plates. (5)

(ii) Removing a rivet from the plates. (5)

(b) What are the essential tools required for the procedure in (a) above. (6)

(a) Describe how cylinder liners are checked for wear. (5)

(b) Explain how these measurements are recorded. (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement. (6)

(a) Describe uses of compressed air onboard the ship. (6)

(b) Describe maintenance schedule of various systems on main air compressor. (6)

(c) Describe Isolation procedure of main air compressor before starting any work. (4)

(a) Describe why priming is required for a centrifugal pump. With the aid of a sketch, describe working of a primer for centrifugal pump. (10)

(b) Why balance holes are provided in the impeller? (6)

For an auxiliary engine, how can you possibly detect leaking or worn piston rings applying each of the following methods:

(a) operational monitoring

(b) performance analysis

(c) direct inspection of the cylinder (16)

Describe the procedure for the regular maintenance routines to be carried out on the various types of portable fire extinguisher on ships. (16)

With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats, (5)

(b) Why the drain must be clear, (5)

(c) Why opening gear should be kept in good working order at all times. (6)

With reference to exhaust valves of an auxiliary diesel engine

(a) Describe how valves are reconditioned (8)

(b) Explain how valve timing is checked and corrected. (8)

Describe, with the aid of neat sketches, the procedure for checking and correcting the alignment of a pump shaft coupled to its driving motor. Explain the dial gauge (rim and face) method in detail, state the acceptable tolerances, and discuss the common causes of misalignment (16)

(a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

(i) Heating arrangement with temperature control. (3)

(ii) Prevention of air lock in the system. (3)

(a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by gear pump? (8)

(b) By suitable drawing describe what is 'back lash' and ennumerate it's importance. How is 'back lash' measured? (4)

(c) What checks will be carried out during overhauls. (4)

(a) How Leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)

(a) Describe by drawing a suitable diagram, Bilge water system of an ocean going ship. Name each part/equipment with its function. (10)

(b) Discuss the commonly associated troubles with the Bilge system and their probable solutions. (6)

(a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

Give reasons why each of the following conditions can result in oil being carried over with the water discharge from lubricating oil centrifuges:-

(a) High throughput of mixture, (6)

(b) Abnormally high temperature of mixture, (6)

(c) Appreciable accumulation of solids in bowl, (4)

Describe how crankshaft deflections of an auxiliary diesel engine are measured. State how the measurements can be checked for accuracy. Specify with reasons other checks that should be made on the crankshaft. (16)

(a) There are three auxiliary engines having separate quick closing valves in the fuel supply line. How will you safely test these valves for each of the engines without causing a blackout? Discuss the process with the help of a diagram. (6)

(b) How will you reset the quick closing valves after the test is completed? (4)

(c) Explain the significance of flywheel marking on a four stroke engine. (6)

Describe reasons and actions to be taken for the following malfunctions on Auxiliary Boiler:

(a) Pilot Burner does not fire (4)

(b) Efficiency of boiler is low (4)

(c) Low water level in the boiler (4)

(d) Flame Failure (4)

(a) State FOUR reasons for persistent slackening of holding down bolts of a main engine. (6)

(b) State FOUR precautions to be observed when fitting non-metallic chocks in order to ensure accurate choking. (4)

(c) State the periodic checks to be made in order to assess the effectiveness of an engine chocking system. (6)

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

(a) The risk associated with opening the unit. (6)

(b) The precaution taken to reduce the risk. (6)

(c) Explain the significance of biological oxygen demand (B.O.D.). (4)

Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out;

(a) As the work starts; (8)

(b) During and after the work. (8)

(a) How are heat exchangers protected from the effects of corrosion? (8)

(b) What are the problems associated with bio-fouling? (8)

Describe the procedure for the regular maintenance routines to be carried out on the Fixed CO2 fire-fighting system. (16)

Explain with a sketch showing the components of an auxiliary engine fuel valve, the complete maintenance procedure including the removal of the fuel valve, pressure-testing and overhaul. (16)

During the watch main engine crank case mist detector alarm has sounded

(a) List the steps to be taken to meet this emergency situation. (8)

(b) Subsequent inspection and action required to put the engine on normal operation (8)

With reference to starting air receivers:

(a) Explain why starting air receivers should be drained frequently, (6)

(b) Describe the procedure for the inspection of the internal surfaces of an receiver, indicating the possible defects, which may be encountered. (10)

During recent periods of maneuvering, a number of air start valve bursting discs or cones have failed. In the circumstance, indicate how the actual cause might be:

(a) Detected; (8)

(b) Rectified. (8)

Describe the immediate actions required following a crankcase oil mist detector alarm. List the preventative measures taken to minimize the risk of crankcase explosions. (16)

Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)

With respect to the properties of fuel oil, explain the significance of the following terms.

(a) Calculated Carbon Aromaticity Inbox (CCAI). (4)

(b) Importance of Sodium to Vanadium Ratio. (4)

(c) Sulphur content (4)

(d) Pour point (4)

(a) What causes cavitation in a Centrifugal pump operation? (6)

(b) If the Engine room Bilge pump not taking suction, explore the probable reasons? (6)

(c) Why is a centrifugal pump started with its discharge valve shut? (4)

(a) How will you align a motor-pump shaft? What are the different methods of alignment that can be used? (8)

(b) Why is the Refrigeration Compressor often belt driven? (8)

With respect to centrifuges,

(a) Explain the reasons which shall cause a purifier to overflow. (6)

(b) What are reasons that induces vibration in a purifier? (4)

(c) Explain the process of desludging? Why is the purifier amperage an important parameter for the operator? (6)

(a) What are the reasons for foaming in refrigeration compressor crankcase? (4)

(b) Describe the causes for the following in the domestic refrigeration system:

(i) Frequent cut-in and cut-out of the compressor. (3)

(ii) Lub oil low pressure cut-out of the compressor. (3)

(iii) High pressure cut-out of the compressor. (3)

(iv) Frosting in the compressor suction side. (3)

(a) Explain the term water hammer indicating possible effects on the system? (8)

(b) State how the risk of water hammer may be avoided? (8)

(a) What is meant by the term 'critical speed' and why it can be a problem on ships ? (8)

(b) Why is it dangerous to run an auxiliary engine at or near its critical speed for extended periods? (8)

Oil traces have been found in the condensate tank of an auxiliary boiler.

(a) Describe the procedure to trace the source of contamination. (8)

(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler. (8)

(a) Describe how leak in a heat exchanger tube is detected? How to rectify leaky tube? (8)

(b) What are the common methods to enhance heat transfer of heat exchanger? (4)

(c) Describe reasons for poor performance of heat exchanger and actions to rectify the same. (4)

Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)

(a) What are the routines carried out on a life boat winch. (6)

(b) What maintenance do the hand brake and Centrifugal brakes require. (5)

(c) At what lowering velocity does the centrifugal brake operate. (5)

Give reasons and remedies for the following 'faults in air compressors.

(a) Excessively hot discharge pipe, (5)

(b) Intermediate stage relief valve lifting, (5)

(c) Noticeable reduction in free air delivery (6)

(a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

(a) Explain why a purifier is not attaining its rated speed on starting from rest? (8)

(b) How do you select the appropriate Gravity disc of a Purifier? Why is this selection an important element in the purifier operation? (8)

Explain with a suitable diagram, the components of an auxiliary engine fuel valve? Briefly explain, the process of overhauling and pressure testing the fuel valve? (16)

(a) What are the basic conditions required to be satisfied, before putting the engine room in Unattended Machinery Spaces (UMS) mode? (6)

(b) List and explain the step by step actions that must be taken in the event of an engine room blackout, while the engine room is unmanned? (10)

(a) Explain the circumstances under which a two stroke engine fails to turn on air. (8)

(b) What investigations and corrective actions are required to be taken by you as a watchkeeping engineer if the engine does not turn on air after repeated trials? (8)

Prepare a report to the Chief Engineer stating how an emergency fire pump which had difficulty taking suction earlier during ballast passage of a ship, is now rectified to operate satisfactorily under any acceptable condition of loading of the ship. (16)

Explain in detail how you would isolate one section of a water sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service. (16)

Describe a procedure for cylinder liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

(a) State, with reasons, the causes of fatigue cracking of engineering components. (4)

(b) State, with reasons, how material and design defects can influence fatigue life. (6)

(c) With reference to engine bed plate transverse girders explain how the incidence of fatigue cracking can be minimized. (6)

With reference to a fuel oil purifier:

(a) What are the reasons that may cause the purifier to overflow? (6)

(b) What are the reasons for the water carryover with the oil? (5)

(c) What are the probable reasons for vibration seen during purifier starting? (5)

Describe the following turbocharger cleaning operations:

(a) Turbine side water washing. (6)

(b) Blower side dry cleaning. (5)

(c) Blower side water washing (5)

(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)

State some built in measures by which the steering gear mechanism can be kept operational, in the event of breakages, pipe failures, motor burn out etc. (16)

Describe the examination you will carry out on the following parts of an air compressor:

(a) Suction and delivery valves and seats (4)

(b) Relief valves and bursting discs (4)

(c) Coolers and cooling passages (4)

(d) Piston and piston rings (4)

The exhaust temperature of an auxiliary diesel engine is found to be excessive and uneven at normal load with dark exhaust at the funnel. Describe the following:

(a) An investigation into the situation; (5)

(b) the procedure to remedy the immediate problems, so identified; (6)

(c) any further action that might be considered necessary. (5)

A centrifugal pump has been opened up due to abnormal noise:

(a) List the checks you will carry out on the various components; (4)

(b) Name the parts which may require replacement; (4)

(c) Checks to be carried out after assembly; (4)

(d) Operational parameters, which may be required to be compared with manufacturers test record. (4)

With reference to auxiliary boilers:

(a) Briefly describe the maintenance procedures for oil burning equipment. (5)

(b) Explain the need for, and the use of, soot blowers. (5)

(c) Describe how a boiler should be taken out of service. (6)

An air cooler of a large two stroke marine diesel engine is showing poor performance. Suggest some measures you would initiate to rectify the problem and improve the performance. (16)

Briefly explain the following:

(a) How would you know a Refrigeration system is 'undercharged'? (4)

(b) What should you do to ensure that there is no water leakage into the engine cylinder before preparing main engine for sea? (4)

(c) What would be the probable cause of a rise in the level of the lub oil sump tank of a main engine? (4)

(d) How does the valve rotator as fitted on an exhaust valve of auxiliary engine work? (4)

With reference to Steering Gear & Hydraulic Power Rotary pumps:

(a) Explain how the reserve of fluid in the system is checked and how make-up is achieved. (5)

(b) Describe how a steering system is tested prior to leaving port with reference to SOLAS. (5)

(c) Explain how tests are made for leaks, and air and other gases are bled from the system. (6)

(a) What are some key components of a heat exchanger that you would examine closely during a maintenance check? (8)

(b) How is leakage detected in plate-type and shell-and-tube heat exchangers? (8)

With reference to stuffing box of a two stroke main engine explain following:

(a) Why stuffing box is required in two stroke diesel engines. (8)

(b) Explain the maintenance carried out on stuffing box during piston overhaul. (8)

During your watch you observe that Main Engine L.O. sump level is rising due to contamination of lubricating oil. Describe the procedure :

(a) To identify the contaminant. (6)

(b) Locate the cause of contamination (4)

(c) Action to make the oil suitable for its continued usage. (4)

With reference to main refrigeration plant give reason for each of the following operational irregularities and state how these are dealt with:

(a) Rapid loss of lubricating oil from the crankcase of a "vee" block compressor. (4)

(b) Steady "fall off" in refrigeration effect over a comparatively short period of time. (4)

(c) Excessive "icing up" at compressor suction. (4)

(d) Short cycling. (4)

Performance of a Fire-pump has deteriorated and is not developing required head. Describe the following:

(a) The procedure for dismantling the pump. (4)

(b) The likely defects and remedial measures to be taken. (3)

(c) Clearances to be checked. (3)

(d) Precautions during assembly. (3)

(e) Checks for alignment of motor pump coupling. (3)

Give reasons why each of the following conditions can result in oil being carried over with the water discharge from lubricating oil centrifuges:

(a) High throughput of mixture. (6)

(b) Abnormally high temperature of mixture. (6)

(c) Appreciable accumulation of solids in bowl. (4)

(a) Describe different components used in soldering process. (6)

(b) Describe soldering process in detail. (6)

(c) What are Do's and Don'ts for good soldering joint. (4)

Write short notes on the following:

(a) The need for taking double bottom tank soundings regularly after a grounding incident. (4)

(b) Need to pre-heat main engines prior to continuous running of the engine. (4)

(c) Utility of pressure gauges on either side of high pressure fuel oil filters. (4)

(d) The purpose of opening indicator cocks before blowing through the engine. (4)

(a) Describe maintenance required on auxiliary boiler burner (8)

(b) Describe safety features provided on fuel burning system of auxiliary boiler. (8)

(a) Describe what would be the indications of crank case explosion in main engine. (4)

(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)

(c) Describe means of prevention of crank case explosion. (4)

Describe reasons and actions to be taken for the following malfunctions on Auxiliary Boiler:

(a) Pilot burner does not fire. (4)

(b) Efficiency of boiler is low. (4)

(c) Low water level in the boiler. (4)

(d) Flame failure. (4)

(a) Describe the procedure for:

(i) Rivetting two plates. (5)

(ii) Removing a rivet from the plates. (5)

(b) What are the essential tools required for the procedure in (a) above. (6)

(a) Describe how cylinder liners are checked for wear. (5)

(b) Explain how these measurements are recorded. (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement. (6)

(a) Describe uses of compressed air onboard the ship. (6)

(b) Describe maintenance schedule of various systems on main air compressor. (6)

(c) Describe isolation procedure of main air compressor before starting any work. (4)

(a) Describe why priming is required for a centrifugal pump. With the aid of a sketch, describe working of a primer for centrifugal pump. (10)

(b) Why balance holes are provided in the impeller? (6)

For an auxiliary engine, how can you possibly detect leaking or worn piston rings applying each of the following methods:

(a) operational monitoring

(b) performance analysis

(c) direct inspection of the cylinder (16)

Describe how crankshaft deflections of an auxiliary diesel engine are measured. State how the measurements can be checked for accuracy. Specify with reasons other checks that should be made on the crankshaft. (16)

With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats. (5)

(b) Why the drain must be clear. (5)

(c) Why opening gear should be kept in good working order at all times. (6)

Describe the procedure for the regular maintenance routines to be carried out on the various types of portable fire extinguisher on ships. (16)

With reference to exhaust valves of an auxiliary diesel engine

(a) Describe how valves are reconditioned (8)

(b) Explain how valve timing is checked and corrected. (8)

(a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

(i) Heating arrangement with temperature control. (3)

(ii) Prevention of air lock in the system. (3)

(a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by gear pump? (8)

(b) By suitable drawing describe what is 'back lash' and enumerate it's importance. How is 'back lash' measured (4)

(c) What checks will be carried out during overhauls. (4)

(a) How Leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)

(a) Describe by drawing a suitable diagram, Bilge water system of an ocean going ship. Name each part/equipment with its function. (10)

(b) Discuss the commonly associated troubles with the Bilge system and their probable solutions. (6)

(a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

With respect to centrifuges:

(a) Explain the reasons which shall cause a purifier to overflow. (6)

(b) What are reasons that induces vibration in a purifier? (4)

(c) Explain the process of desludging? Why is the purifier amperage an important parameter for the operator? (6)

(a) Explain with a sketch showing the components of an auxiliary engine fuel valve, the complete maintenance procedure including the removal of the fuel valve, pressure-testing and overhaul. (12)

(b) What are the precautions to be taken before installation of a fuel valve on the Cylinder head? Indicate the special tools that may be required for the fuel valve removal and overhaul. (4)

(a) There are three auxiliary engines having separate quick closing valves in the fuel supply line. How will you safely test these valves for each of the engines without causing a black-out? Discuss the process with the help of a diagram. (6)

(b) How will you reset the quick closing valves after the test is completed? (4)

(c) Explain the significance of flywheel marking on a four stroke engine. (6)

(a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

(a) State FOUR reasons for persistent slackening of holding down bolts of a main engine. (6)

(b) State FOUR precautions to be observed when fitting non-metallic chocks in order to ensure accurate chocking. (4)

(c) State the periodic checks to be made in order to assess the effectiveness of an engine chocking system. (6)

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

(a) Risk associated with opening the unit. (6)

(b) The precaution taken to reduce the risk (6)

(c) Explain the significance of biological oxygen demand (B.O.D.). (4)

Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out:

(a) As the work starts; (8)

(b) During and after the work. (8)

(a) How are heat exchangers protected from the effects of corrosion? (8)

(b) What are the problems associated with bio-fouling? (8)

Describe the procedure for the regular maintenance routines to be carried out on the Fixed CO2 fire-fighting system. (16)

A jacket cooling water plate type cooler for the engine system is stripped open during overhaul for survey purposes. State out a list of components, parts or areas, which you would like to particularly check yourself before the survey. (16)

During the watch main engine crank case mist detector alarm has sounded

(a) List the steps to be taken to meet this emergency situation. (8)

(b) Subsequent inspection and action required to put the engine on normal operation. (8)

With reference to starting air receivers:

(a) Explain why starting air receivers should be drained frequently. (6)

(b) Describe the procedure for the inspection of the internal surfaces of an receiver, indicating the possible defects, which may be encountered. (10)

During recent periods of maneuvering, a number of air start valve bursting discs or cones have failed. In the circumstance, indicate how the actual cause might be:

(a) Detected; (8)

(b) Rectified. (8)

(a) Describe how leak in a heat exchanger tube is detected? How to rectify leaky tube? (8)

(b) What are the common methods to enhance heat transfer of heat exchanger? (4)

(c) Describe reasons for poor performance of heat exchanger and actions to rectify the same. (4)

Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)

With respect to the properties of fuel oil, explain the significance of the following terms:

(a) Calculated Carbon Aromaticity Index (CCAI). (4)

(b) The importance of Sodium to Vanadium Ratio. (4)

(c) Sulphur content (4)

(d) Pour point (4)

(a) What causes cavitation in a Centrifugal pump operation? (6)

(b) If the Engine room Bilge pump not taking suction, explore the probable reasons? (6)

(c) Why is a centrifugal pump started with its discharge valve shut? (4)

(a) How will you align a motor-pump shaft? What are the different methods of alignment generally used? (8)

(b) Why is the Refrigeration Compressor often belt driven? (8)

(a) Explain why a purifier is not attaining its rated speed on starting from rest? (8)

(b) How do you select the appropriate Gravity disc of a Purifier? Why is this selection an important element in the purifier operation? (8)

(a) What are the reasons for foaming in refrigeration compressor crankcase? (4)

(b) Describe the causes for the following in the domestic refrigeration system: (12)

(i) Frequent cut-in and cut-out of the compressor.

(ii) Low oil pressure cut-out of the compressor.

(iii) High pressure cut-out of the compressor.

(iv) Frosting in the compressor suction side.

(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)

Describe the following turbocharger cleaning operations:

(a) Turbine side water washing. (6)

(b) Turbine side dry cleaning. (5)

(c) Blower side water washing. (5)

Describe the examination you will carry out on the following parts of an air compressor:

(a) Suction and delivery valves and seats (4)

(b) Relief valves and bursting discs (4)

(c) Coolers and cooling passages (4)

(d) Piston and piston rings (4)

The exhaust temperature of an auxiliary diesel engine is found to be excessive and uneven at normal load with dark exhaust at the funnel.

Describe the following:

(a) an investigation into the situation; (5)

(b) the procedure to remedy the immediate problems, an identified; (6)

(c) any further action that might be considered necessary. (5)

A centrifugal pump has been opening up due to abnormal noise:

(a) List the checks you would carry out on the various components; (4)

(b) Name the parts which may require replacement; (4)

(c) Checks to be carried out after assembly; (4)

(d) Operational parameters, which may be required to be compared with manufacturers test record. (4)

With reference to auxiliary boilers:

(a) Briefly describe the maintenance procedures for oil burning equipment. (5)

(b) Explain the need for, and the use of, soot blowers. (5)

(c) Describe how a boiler should be taken out of service. (6)

An air cooler of a large two stroke marine diesel engine is showing poor performance. Suggest some measures you would initiate to rectify the problem and improve the performance. (16)

Briefly explain the following:

(a) How would you know a Refrigeration system is 'undercharged'? (4)

(b) What should you do to ensure that there is no water leakage into the engine cylinder before starting main engine for sea? (4)

(c) What would be the probable cause of a rise in the level of the lub oil sump tank of a main engine? (4)

(d) How does the valve rotator as fitted on an exhaust valve of aux. engine work? (4)

With reference to Steering Gear & Hydraulic Power Rotary pumps:

(a) Explain how the reserve of fluid in the system is checked and how make up is achieved. (5)

(b) Describe how a steering system is tested prior to leaving port with reference to SOLAS. (5)

(c) Explain how tests are made for leaks, and air and other gases are bled from the system. (6)

(a) What are some key components of a heat exchanger that you would examine closely during a maintenance check? (8)

(b) How is leakage detected in plate-type and shell-and-tube heat exchangers? (8)

With reference to stuffing box of a two stroke main engine explain following:

(a) Why stuffing box is required in two stroke diesel engines. (8)

(b) Explain the maintenance carried out on stuffing box during piston overhaul. (8)

Oil traces have been found in the condensate tank of an auxiliary boiler

(a) Describe the procedure to trace the source of contamination. (8)

(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler. (8)

(a) Describe how cylinder liners are checked for wear. (5)

(b) Explain how these measurements are recorded. (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement. (6)

State some built in measures by which the steering gear mechanism can be kept operational, in the event of breakages, pipe failures, motor burn out etc. (16)

Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)

(a) What are the routines carried out on a life boat winch. (6)

(b) What maintenance do the hand brake and Centrifugal brakes require. (5)

(c) At what lowering velocity does the centrifugal brake operate. (5)

Give reasons and remedies for the following faults in air compressors.

(a) Excessively hot discharge pipe. (5)

(b) Intermediate stage relief valve lifting. (5)

(c) Noticeable reduction in free air delivery (6)

With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats, (5)

(b) Why the drain must be clear, (5)

(c) Why opening gear should be kept in good working order at all times. (6)

With reference to a fuel oil purifier:

(a) What are the reasons that may cause the purifier to overflow? (6)

(b) What are the reasons for the water carry-over with the oil? (5)

(c) What are the probable reasons for vibration seen during purifier starting? (5)

Explain with a suitable diagram, the components of a an auxiliary engine fuel valve? Briefly explain, the process of overhauling and pressure testing the fuel valve? (16)

(a) Explain the circumstances under which a two stroke engine fails to turn on air. (8)

(b) What investigations and corrective actions are required to be taken by you as a watchkeeping engineer if the engine does not turn on air after repeated trials? (8)

Prepare a report to the Chief Engineer stating how an emergency fire pump which had difficulty taking suction earlier during ballast passage of a ship, is now rectified to operate satisfactorily under any acceptable condition of loading of the ship. (16)

Explain in detail how you would isolate one section of a water sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service. (16)

Describe a procedure for cyliner liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

(a) State, with reasons, the causes of fatigue cracking of engineering components. (4)

(b) State, with reasons, how material and design defects can influence fatigue life. (6)

(c) With reference to engine bed plate transverse girders explain how the incidence of fatigue cracking can be minimized. (6)

(a) Describe different components used in soldering process. (6)

(b) Describe soldering process in detail. (6)

(c) What are Do's and Don'ts for good soldering joint. (4)

Write short notes on the following:

(a) The need for taking double bottom tank soundings regularly after a grounding incident. (4)

(b) Need to pre-heat main engines prior to continuous running of the engine. (4)

(c) Utility of pressure gauges on either side of high pressure fuel oil filters. (4)

(d) The purpose of opening indicator cocks before blowing through an engine. (4)

(a) Describe maintenance required on auxilliary boiler burner. (8)

(b) Describe safety features provided on fuel burning system of auxilliary boiler. (8)

(a) Describe what would be the indications of crank case explosion in main engine. (4)

(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)

(c) Describe means of prevention of crank case explosion. (4)

(a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

(i) Heating arrangement with temperature control. (3)

(ii) Prevention of air lock in the system. (3)

(a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by a gear pump? (8)

(b) By suitable drawing describe what is 'back lash' and enumerate it's importance.

How is 'back lash' measured? (4)

(c) What checks will be carried out during overhauls. (4)

(a) How Leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)

(a) Describe by drawing a suitable diagram, Bilge water system of an ocean going ship. Name each part/equipment with its function. (10)

(b) Discuss the commonly associated troubles with the Bilge system and their probable solutions. (6)

(a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

With respect to centrifuges,

(a) Explain the reasons which shall cause a purifier to overflow. (6)

(b) What are reasons that induces vibration in a purifier? (4)

(c) Explain the process of desludging ? Why is the purifier amperage an important parameter for the operator? (6)

(a) Explain with a sketch showing the components of an auxiliary engine fuel valve, the complete maintenance procedure including the removal of the fuel valve, pressure-testing and overhaul. (12)

(b) What are the precautions to be taken before installation of a fuel valve on the Cylinder head? Indicate the special tools that may be required for the fuel valve removal and overhaul. (4)

(a) There are three auxiliary engines having separate quick closing valves in the fuel supply line. How will you safely test these valves for each of the engines without causing a blackout? Discuss the process with the help of a diagram. (6)

(b) How will you reset the quick closing valves after the test is completed? (4)

(c) Explain the significance of flywheel marking on a four stroke engine. (6)

(a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

(a) Describe how leak in a heat exchanger tube is detected? How to rectify leaky tube? (8)

(b) What are the common methods to enhance heat transfer of heat exchanger? (4)

(c) Describe reasons for poor performance of heat exchanger and actions to rectify the same. (4)

Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)

With respect to the properties of fuel oil, explain the significance of the following terms.

(a) Calculated Carbon Aromaticity Inbox (CCAI). (4)

(b) The importance of Sodium to Vanadium Ratio. (4)

(c) Sulphur content (4)

(d) Pour point (4)

(a) What causes cavitation in a Centrifugal pump operation? (6)

(b) If the Engine room Bilge pump not taking suction, explore the probable reasons? (6)

(c) Why is a centrifugal pump started with its discharge valve shut? (4)

(a) How will you align a motor-pump shaft? What are the different methods of alignment that can be used? (8)

(b) Why is the Refrigeration Compressor often belt driven? (8)

(a) Explain why a purifier is not attaining its rated speed on starting from rest? (8)

(b) How do you select the appropriate Gravity disc of a Purifier? Why is this selection an important element in the purifier operation? (8)

(a) What are the reasons for foaming in refrigeration compressor crankcase? (4)

(b) Describe the causes for the following in the domestic refrigeration system:

(i) Frequent cut-in and cut-out of the compressor. (3)

(ii) Lub oil low pressure cut-out of the compressor. (3)

(iii) High pressure cut-out of the compressor. (3)

(iv) Frosting in the compressor suction side. (3)

(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)

Describe the following turbocharger cleaning operations:

(a) Turbine side water washing. (6)

(b) Turbine side dry cleaning. (5)

(c) Blower side water washing (5)

Describe the examination you will carry out on the following parts of an air compressor:

(a) Suction and delivery valves and seats (4)

(b) Relief valves and bursting discs (4)

(c) Coolers and cooling passages (4)

(d) Piston and piston rings (4)

The exhaust temperatures of an auxiliary diesel engine are found to be excessive and uneven at normal load, with dark exhaust at the funnel.

Describe EACH of the following:

(a) An investigation into the situation (5)

(b) The procedure to remedy the immediate problems (6)

(c) Any further action that might be necessary (5)

A centrifugal pump has been opened up due to abnormal noise:

(a) List the checks you will carry out on the various components; (4)

(b) Name the parts which may require replacement; (4)

(c) Checks to be carried out after assembly; (4)

(d) Operational parameters, which may be required to be compared with manufacturers test record. (4)

With reference to auxiliary boilers;

(a) Briefly describe the maintenance procedures for oil burning equipment. (5)

(b) Explain the need for and the use of soot blowers. (5)

(c) Describe how a boiler should be taken out of service. (6)

An air cooler of a large two stroke marine diesel engine is showing poor performance. Suggest some measures you would initiate to rectify the problem and improve the performance. (16)

Briefly explain the following:

(a) How would you know if a refrigeration system is 'undercharged'? (4)

(b) What should you do to ensure that there is no water leakage into the engine cylinder before preparing main engine for sea? (4)

(c) What could be the probable cause of a rise in the level of the lub oil sump tank of a main engine? (4)

(d) How does the valve rotator as fitted on an exhaust valve of aux. engine work? (4)

With reference to Steering Gear & Hydraulic Power Rotary pumps:

(a) Explain how the reserve of fluid in the system is checked and how make-up is achieved? (5)

(b) Describe how a steering system is tested prior to leaving port with reference to SOLAS (5)

(c) Explain how tests are made for leaks, and air and other gases are bled from the system. (6)

With respect to centrifuges,

(a) Explain the reasons which shall cause a purifier to overflow. (6)

(b) Explain reasons that induces vibration in a purifier? (4)

(c) Explain the process of desludging? Why is the purifier amperage an important parameter for its operation? (6)

With reference to stuffing box of a two stroke main engine explain following:

(a) Why stuffing box is required in two stroke diesel engines.

(b) Explain the maintenance carried out on stuffing box during piston overhaul.

(a) Describe the procedure for:

(i) Riveting work (5)

(ii) Removing a stud from the plates. (5)

(b) What are the essential tools required for the procedure in (a) above. (6)

(a) Describe how cylinder liners are checked for wear. (5)

(b) Explain how these measurements are recorded. (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement. (6)

(a) Describe uses of compressed air onboard the ship. (6)

(b) Describe maintenance schedule of various systems on main air compressor. (6)

(c) Describe Isolation procedure of main air compressor before starting any work. (4)

(a) Describe why priming is required for a centrifugal pump. With the aid of a sketch, describe working of a primer for centrifugal pump. (10)

(b) Why balance holes are provided in the impeller? (6)

Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out: (16)

(a) As the work starts:

(b) During and after the work.

Describe how crankshaft deflections of an auxiliary diesel engine are measured. State how the measurements can be checked for accuracy. Specify with reasons other checks that should be made on the crankshaft. (16)

With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats. (5)

(b) Why the drain must be clear. (5)

(c) Why opening gear should be kept in good working order at all times. (6)

Describe the procedure for the regular maintenance routines to be carried out on the various types of portable fire extinguisher on ships. (16)

With reference to exhaust valves of an auxiliary diesel engine

(a) Describe how valves are reconditioned (8)

(b) Explain how valve timing is checked and corrected. (8)

(a) State FOUR reasons for persistent slackening of holding down bolts of a main engine. (6)

(b) State FOUR precautions to be observed when fitting non-metallic chocks in order to ensure accurate chocking. (4)

(c) State the periodic checks to be made in order to assess the effectiveness of an engine chocking system. (6)

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

(a) The risk associated with opening he unit. (6)

(b) The precaution taken to reduce the risk. (6)

(c) Explain the significance of biological oxygen demand (B.O.D.). (4)

Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out:

(a) As the work starts; (8)

(b) During and after the work. (8)

(a) How are heat exchangers protected from the effects of corrosion? (8)

(b) What are the problems associated with bio-fouling? (8)

Describe the procedure for the regular maintenance routines to be carried out on the Fixed CO2 fire-fighting system. (16)

A jacket cooling water, plate type cooler for the engine system is stripped open during overhaul for survey purposes, State out a list of components/ parts or areas, which you would like to particularly check yourself before the survey. (16)

During the watch main engine crank case mist detector alarm has sounded

(a) List the steps to be taken to meet this emergency situation. (8)

(b) Subsequent inspection and action required to put the engine on normal operation (8)

With reference to starting air receivers:

(a) Explain why starting air receivers should be drained frequently. (6)

(b) Describe the procedure for the inspection of the internal surfaces of an receiver, indicating the possible defects, which may be encountered. (10)

During recent periods of maneuvering, a number of air start valve bursting discs or cones have failed. In the circumstance, indicate how the actual cause might be:

(a) Detected; (8)

(b) Rectified. (8)

Oil traces have been found in the condensate tank of an auxiliary boiler

(a) Describe the procedure to trace the source of contamination. (8)

(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler. (8)

(a) Give an outline sketch of a Fresh Water hydrophone system, briefly explain the system. (10)

(b) Discuss the merits and demerits of using water as cooling medium for pistons, when compared to oil? (6)

State some built in measures by which the steering gear mechanism can be kept operational, in the event of breakages, pipe failures, motor burn out etc. (16)

Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)

(a) What are the routines carried out on a life boat winch. (6)

(b) What maintenance do the hand brake and Centrifugal brakes require. (5)

(c) At what lowering velocity does the centrifugal brake operate. (5)

Give reasons and remedies for the following faults in air compressors.

(a) Excessively hot discharge pipe. (5)

(b) Intermediate stage relief valve lifting. (5)

(c) Noticeable reduction in free air delivery. (6)

(a) Explain the function of an 'eductor' with the aid of a sketch. Where do you find an eductor system on a ship? Give two examples. (8)

(b) Explain the working principle of an eductor. What are the operational challenges that may affect the performance of the eductor? (8)

With reference to a fuel oil purifier:

(a) What are the reasons that may cause the purifier to overflow? (6)

(b) What are the reasons for the water carry-over with the oil? (5)

(c) What are the probable reasons for vibration seen during purifier starting? (5)

Explain with a suitable diagram, the components of a an auxiliary engine fuel valve? Briefly explain, the process of overhauling and pressure testing the fuel valve? (16)

(a) Explain the circumstances under which a two stroke engine fails to turn on air. (8)

(b) What investigations and corrective actions are required to be taken by you as a watchkeeping engineer if the engine does not turn on air after repeated trials? (8)

Prepare a report to the Chief Engineer stating how an emergency fire pump which had difficulty taking suction earlier during ballast passage of a ship, is now rectified to operate satisfactorily under any acceptable condition of loading of the ship. (16)

Explain in detail how you would isolate one section of a water sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service. (16)

Describe a procedure for cylinder liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

(a) State, with reasons, the causes of fatigue cracking of engineering components. (4)

(b) State, with reasons, how material and design defects can influence fatigue life. (6)

(c) With reference to engine bed plate transverse girders explain how the incidence of fatigue cracking can be minimized. (6)

(a) Describe different components used in soldering process. (6)

(b) Describe soldering process in detail. (6)

(c) What are Do's and Don'ts for good soldering joint. (4)

Write short notes on the following:

(a) The need for taking double bottom tank soundings regularly after a grounding incident. (4)

(b) Need to pre-heat main engines prior to continuous running of the engine. (4)

(c) Utility of pressure gauges on either side of high pressure fuel oil filters. (4)

(d) The purpose of opening indicator cocks before blowing through an engine. (4)

(a) Describe maintenance required on auxiliary boiler burner. (8)

(b) Describe safety features provided on fuel burning system of auxiliary boiler. (8)

(a) Describe what would be the indications of crank case explosion in main engine. (4)

(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)

(c) Describe means of prevention of crank case explosion. (4)

(a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

(i) Heating arrangement with temperature control. (3)

(ii) Prevention of air lock in the system. (3)

(a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by gear pump? (8)

(b) By suitable drawing describe what is 'backlash' and enumerate it's importance. How is 'backlash' measured? (4)

(c) What checks will be carried out during overhauls. (4)

(a) How leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)

(a) Describe by drawing a suitable diagram, Bilge water system of an ocean going Ship. Name each part/equipment with its function. (10)

(b) Enumerate commonly associated troubles with the Bilge system and their probable solutions. (6)

(a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

With respect to centrifuges,

(a) Explain the reasons which shall cause a purifier to overflow. (6)

(b) What are reasons that induces vibration in a purifier? (4)

(c) Explain the process of desludging. Why is the purifier amperage an important parameter for the operator? (6)

(a) Explain with a sketch showing the components of an auxiliary engine fuel valve, the complete maintenance procedure including the removal of the fuel valve, pressure testing and overhaul. (12)

(b) What are the precautions to be taken before installation of a fuel valve on the Cylinder head? Indicate the special tools that may be required for the fuel valve removal and overhaul. (4)

The exhaust temperatures of an auxiliary diesel engine are found to be excessive and uneven at normal load, with dark exhaust at the funnel. Describe EACH of the following:

(a) An investigation of the situation; (5)

(b) The procedure to remedy the immediate problems; (6)

(c) Any further action that might be necessary. (5)

(a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

(a) Describe how leak in leaky tube in Heat exchanger is detected? How to rectify leaky tube? (8)

(b) What are the common methods to enhance heat transfer of heat exchanger (4)

(c) Describe reasons for poor performance of heat exchanger and actions to rectify the same. (4)

Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)

With respect to the properties of fuel oil, explain the significance of the following terms

(a) Calculated Carbon Aromaticity index (CCAI). (4)

(b) The Importance of Sodium to Vanadium ratio. (4)

(c) Sulphur content. (4)

(d) Pour point. (4)

(a) What causes cavitation in a Centrifugal pump operation? (6)

(b) If the Engine room bilge pump not taking suction, explore the probable reasons. (6)

(c) Why is a centrifugal pump started with its discharge valve shut. (4)

(a) How will you align a motor-pump shaft? What are the different methods of alignment that can be used? (8)

(b) Why is the Fridge Compressor Belt Driven? (8)

(a) Explain why a purifier is not attaining its rated speed on starting from rest? (8)

(b) How do you select the appropriate Gravity Disc of Purifier? Why is this selection an important element in the purifier operation? (8)

(a) What are the reasons for foaming in refrigeration compressor crankcase. (4)

(b) Describe the causes for the following in the domestic refrigeration system:

(i) Frequent cut-in and cut-off of the compressor (3)

(ii) Lub oil low pressure cut-out of the compressor (3)

(iii) High pressure cut-out of the compressor (3)

(iv) Frosting on the compressor suction side (3)

(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)

Describe the following turbocharger cleaning operations:

(a) Turbine side water washing (6)

(b) Turbine side Dry cleaning (5)

(c) Blower side water washing (5)

Draw cooling water system of main engine and naming each component and describe flow of cooling water through the system. (16)

The reciprocating bilge pump on board your ship, has gradually stopped taking suction from the engine room bilge wells. Write a letter to the owner / manager stating the parts of the pump you suspect are either worn out or broken. (16)

Describe following procedures for rudder maintenance in a dry dock.

(a) What is Jumping Clearance and why is it considered a value of importance? (8)

(b) What is Rudder Drop and describe the procedure for measuring the rudder drop? (8)

Describe following non-destructive test methods:

(a) Dye penetration test - principle, and method in detail (8)

(b) Magnetic particle testing - principle and method in detail. (8)

(a) Describe types of arc welding processes. (8)

(b) Describe what level of temperatures are reached during are welding. (4)

(c) Describe precautions taken to avoid health and shock hazards during welding. (4)

A centrifugal pump has been opened up due to abnormal noise:

(a) List the cheeks you will carry out on various parts; (4)

(b) Name the parts which may require replacement; (4)

(c) Checks to be carried out after assembly; (4)

(d) Operational parameters, which may be required to be compared with manufacturers test record. (4)

(a) Describe how Auxiliary engine crankshaft deflections are measured (6)

(b) State how the measurements can be checked for accuracy (5)

(c) Specify with reasons other checks that should be made on the crankshaft (5)

(a) Describe working of a Mechanical Shaft seal with a diagram. How working fluid leak is prevented? (8)

(b) What are the causes of Mechanical Shaft seal failure? (4)

(c) Describe the advantages and disadvantages for mechanical shaft seal usage (4)

With reference to lifeboats and davits describe (a & b) with the aid of sketches

(a) "The purpose and types of "limits switches": (6)

(b) The centrifugal brake and state the method of testing. (5)

(c) Enumerate routine maintenance of the lifeboat engine and the life boat winch (5)

(a) Describe safety limits provided on deck cranes. (6)

(b) Describe regular maintenance required on deck cranes. (5)

(c) Discuss in the Indian context, the inspection, testing and certification regime being followed for the lifting appliances on ships. (5)

Describe following non destrutive methods:

(a) Radiographic Inspection - principle, method in detail. (8)

(b) Ultrasonic Inspection - principle, method in detail. (8)

With regard to keeping the gas side of boilers in good condition discuss EACH of the following:

(a) The mechanism of combustion, stating the factors which are important for good combustion (6)

(b) Oil fuel treatments (5)

(c) Soot removal equipment. (5)

During your watch you observe that Main Engine L.O. sump level is rising due to contamination of lubricating oil. Describe the procedure to:

(a) Identify the contaminant. (6)

(b) Locate the cause of contamination (6)

(c) Action to make the oil suitable for its continued usage. (4)

To achieve the optimum performance from a main air compressor, describe the routine maintenance necessary on the following components;

(a) Unloader (4)

(b) Air intake filter (4)

(c) Suction/Discharge valves (4)

(d) Intercoolers (4)

With reference to stuffing Box of a two stroke main engine explain following:

(a) Why stuffing box is required in two stroke diesel engines. (8)

(b) Explain the maintenance carried out on stuffing box during piston overhaul (8)

(a) Sketch, describe and explain the operation of the domestic refrigeration system of a ship using one of the HFC as refrigerant. What kind of maintenance is essential for the system. (8)

(b) Describe the causes for the following in the domestic refrigeration system: (8)

(i) frequent cut-in and cut-off of the compressor

(ii) lub oil low pressure cut out of the compressor

(iii) high pressure cut out of the compressor

(iv) frosting on the compressor suction side

The exhaust temperatures of an auxiliary diesel engine are found to be excessive and uneven at normal load, with dark exhaust at the funnel. Describe EACH of the following: (a) An investigation into the situation; (5)

(b) The procedure to remedy the immediate problems; (6)

(c) Any further action that might be necessary. (5)

With respect to centrifuges,

(a) Explain how the vertical height is measured, and Why vertical height of the shaft is so critical? (6)

(b) Describe the troubles that occur on centrifuges during operation and their rectification procedure. (10)

(a) State FOUR reasons for persistent slackening of holding down bolts of a main engine. (6)

(b) State FOUR precautions to be observed when fitting non-metallic chocks in order to ensure accurate chocking. (4)

(c) State the periodic checks to be made in order to assess the effectiveness of an engine chocking system (6)

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

(a) The risk associated with opening the unit. (6)

(b) The precaution taken to reduce the risk (6)

(c) Explain the signiticance of biological oxygen demand (B.O.D.) (4)

Work is being carried out in drydock on a large sea water inlet chest and the valves

Describe the inspection you would carry out

(a) As the work starts. (8)

(b) During and after the work. (8)

(a) How are heat exchangers protected from the effects of corrosion? (8)

(b) What are the problems associated with bio-fouling? (8)

Describe the procedure for the regular maintenance routines to be carried out on the Fixed CO2 fire-fighting system. (16)

A jacket cooling water, plate type cooler for the engine system is stripped open during overhaul for survey purposes, State out a list of components, parts or areas, which you would like to particularly check yourself before the survey (16)

During the watch main engine crank case mist detector alarm has sounded

(a) List the steps to be taken to meet this emergency situation. (8)

(b) Subsequent inspection and action required to put the engine on normal operation. (8)

With reference to starting air receivers

(a) Explain why starting air receivers should be drained frequently (6)

(b) Describe the procedure for the inspection of the internal surfaces of an receiver, indicating the possible defects, which may be encountered. (10)

During recent periods of maneuvering, a number of air start valve bursting discs or cones have failed. In the circumstance, indicate how the actual cause might be:

(a) Detected (8)

(b) Rectified (8)

(a) Describe various types of valves used in Engine room. State reasons for their use for particular type of valves. (10)

(b) Describe Materials used for different parts of each design. (6)