TEGK-1400-03 3rd Engineer Officer Exam - Past Paper PDF

Candidate’s Name: National ID: Ports and Maritime Organization Seafarers' Affairs Directorate Exam Code: TEGK-1400-03 Subject: General Engine...

Candidate’s Name: National ID: Ports and Maritime Organization Seafarers' Affairs Directorate Exam Code: TEGK-1400-03 Subject: General Engineering Knowledge Date: 15/08/1400 Rank: 3rd EngineerOfficer (KW>3000) Time Allowed: 3 Hours (Pass mark: 60) Q1 With regards to engineering materials: a) What do you understand by the term “heat treatment”? 4 marks b) Name the heat treatment processes. 2 marks c) Explain one of the heat treatment processes named in part “b” question by your 6 marks own choice. 1-2-3-GK-4-S-12-06-01-03-00 material Answer: Source: question and answer on the marine diesel engine by john Lambs page 137 Heat treatment is the name given to the process of heating metal above the critical temperature, at which internal changes occur, and then cooling the metal slowly or rapidly to give it more desirable physical and mechanical properties. The heat~treatment processes are normalizing, annealing, hardening, and tempering. ((Steel is normalized by heating it slowly to just above the temperature at which changes in the internal structure take place; it is then soaked at this temperature. After the soaking period, the steel is cooled slowly in air. Air cooling is referred to as medium cooling.)) ((Annealing is similar to normalizing. Different rates of cooling are required for different materials. Steel is annealed by heating to the required temperature at which its internal structure changes, and then soaking at this temperature. After soaking, the steel is cooled slowly in a furnace. Furnace cooling is referred to as slow cooling.)) ((Steel is hardened by heating to a specified temperature followed by rapid cooling. The cooling may be in the air, or by quenching in oil or water)) ((Steel is tempered by heating hardened steel and then cooling it by air or Quenching)) Q2 Sketch and briefly describe a suitable lubrication system of stern tube bearing, for a vessel with a large change in the draught, labeling all parts. 1-2-3-GK-5-M-14-01-04-01-05 shafting 14 marks Source: H.D McGoorge General engineering knowledge third edition page 115 Q3 With regards to instrumentation and control sketch and explain two different types of tachometer by your own choice. 12 marks 1-2-3-GK-5-S-12-01-04-01-08 control Answer: Source: G. J. Roy Notes on Instrumentation and Control page 39, 40, 41 Q4 Sketch and describe the typical fire-main line diagram, include in your answer: 4 marks a) The number and type of pumps 2 marks b) Reasons for the drain valve 2 marks c) Position of any isolating valve and reasons their existence 2 marks d) Location of the international shore connection 1-2-3-GK-5-S-12-01-05-02-01 safety Answer: ∗ This is a pipeline system over all areas of the ship, including engine room, accommodation, stores, deck, etc. ∗ At least two independently powered pumps taking suction from seawater are used to charge the system. These pumps must be capable of being started from the bridge, engine control room, local station, and another place like a fire control room. The minimum capacity of such pumps is mentioned in SOLAS regulations. ∗ At least one emergency fire pump must be present. This should be in a place outside of the machinery space and totally independent from the other machineries, capable of using emergency power (if electrical) or have its own fuel tank and starting arrangement (if diesel-driven). Electrical emergency fire pumps should be capable of starting remotely. ∗ Where steel pipes are used, they are galvanized after bending and welding. Diameter is between 50mm and 178mm, depending on the size and type of ship. ∗ The deck-main has a drain at the lowest position so that the pipe can be emptied (particularly of fresh water) in cold weather. If this is not done, the pipe can be damaged by the water freezing, but more important, it will be blocked by the ice and not usable. ∗ Isolating valves are used to isolate machinery space, deck area, and accommodation zone if necessary. The position of this valve must be mentioned in the ship fire plan and labeled. It is usually near accommodation entrances or the forward side of the accommodation. ∗ The diameter of the water pipes shall be sufficient to enable an adequate supply of water to be provided for the simultaneous operation of at least two fire hoses and for the projection thereby of two powerful jets of water. The number and position of the hydrants shall be such that at least two such jets may be directed into any part of the ship by means of two fire hoses each not exceeding 18 m in length, each jet being supplied from a separate hydrant. At least one fire hose shall be provided for each hydrant  ∗ An international shore connection must be provided to enable water to be supplied from another ship or from the shore to the fire-main and fixed provision shall be made to enable such a connection to be used on the port side and the starb Q5 Explain a safe procedure to take over an engineering watch. 12 marks 1-2-3-GK-4-S-12-01-01-01-01 watchkeeping Source: Introduction to Marine Engineering by D. A. Taylor page 342, 343 The system of watches adopted on board ship is usually a four hour period of working with eight hours rest for the members of each watch. The three watches in any 12 hour period are usually 12-4, 4—8 and 8-12. The word 'watch' is taken as meaning the time period and also the personnel at work during that period. The watchkeeping arrangements and the make up of the watch will be decided by the Chief Engineer. Factors to be taken into account in this matter will include the type of ship, the type of machinery and degree of automation, the qualifications and experience of the members of the watch, any special conditions such as weather, ship location, international and local regulations, etc. The engineer officer in charge of the watch is the Chief Engineer's representative and is responsible for the safe and efficient operation and upkeep of all machinery affecting the safety of the ship. Operating the watch An engineer officer in charge, with perhaps a junior engineer assisting and one or more ratings, will form the watch. Each member of the watch should be familiar with his duties and the safety and survival equipment in the machinery space. This would include a knowledge of the fire fighting equipment with respect to location and operation, being able to distinguish the different alarms and the action required, an understanding of the communications systems and how to summon help and also being aware of the escape routes from the machinery space. At the beginning of the watch the current operational parameters and the condition of all machinery should be verified and also the log readings should correspond with those observed. The engineer officer in charge should note if there are any special orders or instructions relating to the operation of the main machinery or auxiliaries. He should determine what work is in progress and any hazards or limitations this presents. The levels of tanks containing fuel, water, slops,  ballast, etc., should be noted and also the level of the various bilges. The operating mode of equipment and available standby equipment should also be noted. At appropriate intervals inspections should be made of the main propulsion plant, auxiliary machinery and steering gear spaces. Any routine adjustments may then be made and malfunctions or breakdowns can be noted, reported and corrected. During these tours of inspection bilge levels should be noted, piping and systems observed for leaks, and local indicating instruments can be observed. Where bilge levels are high, or the well is full, it must be pumped dry. The liquid will be pumped to an oily water separator, and only clean water is to be discharged overboard. Particular attention must be paid to the relevant oil pollution regulations both of a national and international nature, depending upon the location of the ship. Bilges should not be pumped when in port. Oily bilges are usually emptied to a slop tank from which the oil may be reclaimed or discharged into suitable facilities when in port. The discharging of oil from a ship usually results in the engineer responsible and the master being arrested. Bridge orders must be promptly carried out and a record of any required changes in speed and direction should be kept. When under standby or manceuvring conditions with the machinery being manually operated the control unit or console should be continuously manned. Certain watchkeeping duties will be necessary for the continuous operation of equipment or plant—the transferring of fuel for instance. In addition to these regular tasks other repair or maintenance tasks may be required of the watchkeeping personnel. However no tasks should be set or undertaken which will interfere with the supervisory duties relating to the main machinery and associated equipment. During the watch a log or record will be taken of the various parameters of main and auxiliary equipment. This may be a manual operation or provided automatically on modern vessels by a data logger. A typical log book page for a slow-speed diesel driven vessel is shown in designed values for the particular speed or fuel lever settings. Q6 a) Sketch centrifugal pump characteristic curves, then with reference to your sketch: b) State why the discharge valve should be closed before starting a large centrifugal 4 marks pump. 4 marks c) State why these types of pumps do not require relief valve. 4 marks 1-2-3-GK-5-S-12-01-04-01-06 pump Answer:  b) In centrifugal pumps the power absorbed (current passed by the pump and the voltage used by the pump) is increased when the discharge rate is increased. (It is clearly showed in the characteristic curves.) Starting a large centrifugal pump with full discharge valve opened causes a voltage dip or current surge in the electrical system. c) In a centrifugal pump, if the discharge is fully closed or chocked, then the pump will merely churn the water and the pressure on the system doesn't rise up. So fitting a relief valve is not essential. Q7 a) Explain why the freshwater produced on board ships required treatment? b) Explain three methods of making distillate water potable? 5 marks 1-2-3-GK-4-S-14-01-04-01-06 FWG 9 marks Answer: Source: H.D McGoorge General engineering knowledge (3rd edition) page 145 DISTILLATE TREATMENT The low operating temperature of the evaporator described. is not sufficient to sterilize the product. Despite precautions near the coast, harmful organisms Q8 Sketch and explain four-ram steering gear name all components. 1-2-3-GK-5-S-12-01-04-01-07 steering 12 marks Answer: Source: Reeds VOL 8 general engineering knowledge page 192, 193 ∗ The system consists of: - Two separate pumps, one working and one reserved for standby. - Four rams of the same size. - Replenishing system with non-return valves to replace any possible oil loss. - Bypass and relieve valves for each pair of rams to ensure safe working of the system. ∗ Operation (Assuming counter-clockwise rotation of the wheel): - The command is received by the hunting gear from the receiver link. - The pump actuating lever is moved leftward. - The active pump (supposing left side) is actuated. - Valves C and D are then in the discharge side and valves B and E are in the suction side of the pump. - The rudder stock is then rotated counter-clockwise. - The feedback signal is fed to the hunting gear through the buffer spring. - Rotation is finished and pumping is stopped when the hunting gear is reached back to the equilibrium condition. 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