DieselShip's Online Content Library

Q1. (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 watch keeping engineer if the engine does not turn on air after repeated trials? (8)

Q1) With reference to rotary vane steering gears:

(a) Describe, with the aid of a sketch, how such a unit incorporates an integral rudder carrier (10)

(b) Explain how vertical rudder movement is accommodated (6)

Q3. With regards to the metacentric height, which of the following statements is true? (16)

(a) It is used to indicate the quality of initial stability.

(b) It is located below the center of buoyancy.

(c) It is measured vertically above the center of buoyancy.

(d) Its determination is the objective of the inclining experiment. Briefly justify your answer.

Q1. Explain with a simple line sketch, a main engine jacket cooling automatic control system capable of maintaining the jacket water temperature within close limits during wide changes in engine load. (16)

Q1. (a) Explain the purpose of a Hot Work permit. (6)

(b) State the different types of work permit used on ships and their utility. (6)

(c) Prepare a checklist for issuance of Hot Work permit. (8)

Q2. 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)

Q2) A main air compressor interstage air-cooler has burst. Put down a logical sequence of event that could have caused this accident. Put down your analysis, point by point and complete in technical detail (16)

Q2. Explain the meaning and purpose of EACH of the following terms:

(a) Bulbous bow (4)

(b) Hawse pipe (4)

(c) Spurling pipe (4)

(d) Cable stopper (4)

Q2. a) What is the function of insulation in an electric conductor? (3)

b) What are the various classes of insulation? (8)

c) What are the desired properties of insulating materials? (5)

Q2. Write short notes on following:

(a) Immersion suit (5)

(b) TPA (5)

(c) Anti-exposure suit (5)

(d) EEBD (5)

Q3. (a) Briefly explain the construction and functions of a bedplate in a slow speed marine diesel engine? (8)

(b) How is the bedplate fastened to the hull structure? (4)

(c) What is the function of the tie-rod in a slow speed 2-stroke engine? (4)

Q3.a) How protection is provided for electrical short circuit. (4)

b) Describe the construction and operation of HRC fuses? (8)

c) What are the advantages of HRC fuses. (4)

Q2. Define the main purpose of the following with respect to tank and pumping system.
(a) Weighted cocks on tank sounding pipes (4)

(b) Remote operated gear for bilge valves (4)

(c) Ventilation pipes for double bottom tanks (4)

(d) Explain why gauze is sometimes fitted to tank ventilation pipes and explain the effect of mesh size. (4)

Q3. i) Name the gases usually found inside enclosed spaces. (6)

ii) What instruments are used in detecting/checking the gases which are present? (6)

iii) What is the minimum level of oxygen required for entry into enclosed space. (2)

iv) With a simple diagram, explain the working of oxygen content meter. (6)

Q3. 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)

Q4. (a) What is a Fire control plan (F.C.P) and what information does it provide? (5)

(b) State 5 nos. graphic symbols shown in the plan and state the language in which the plan is drafted. (5)

(c) Mention the locations at which the FCP is displayed? (5)

(d) How does the FCP aid the shore fire fighting team?

Q4. Describe a procedure for cylinder liner calibration indicating how the readings are recorded to allow for easy recognition of liner wear. (16)

Q4) Give an outline sketch of Heavy F.O. settling tank heating system and briefly explain the system. Sketch only the low-pressure steam inlet up to condensate collection tank (16)

Q4. Sketch a plain bulkhead, showing connections to deck, sides and double bottom and the arrangement of stiffeners (16)

Q9. (a) Shunt generators having drooping characteristics are best suited for parallel operation. Discuss (6)

(b) Two 220 V D.C. generators each having linear external characteristics, operated in parallel. One machine has a terminal voltage of 270 V, on no-load and 220 V at a load current of 35 A, while the other has a voltage of 280 V at no-load and 220 V at 50 A. Calculate the output current of each machine and the bus bar voltage when the total load is 60 A. What is the kW output of each machine under this condition. (10)

Q5. Write short notes on following with respect to lifeboats:

(a) Marking on lifeboat (5)

(b) Davit limit switches (5)

(c) Centrifugal brakes (5)

(d) DMU/HRU (5)

Q5. (a) Why exhaust outlet of marine diesel engine turbocharger is lower than inlet temperature? (6)

(b) Why do we need an air cooler and why is the scavenge air temperature maintained at 40°C? (10)

Q5) The auxiliary boiler of a ship periodically needs feed water, and the rate of feed is gradually increasing every day, without an increase in demand. Suggest some causes for such a happening. (16)

Q5. Write short notes on each of the following with respect to their contribution to the strength of ships:

(a) Strake (4)

(b) Bracket (4)

(c) Stringer (4)

(d) Girder (4)

Q5.a) Briefly explain static induction and dynamic induction. (6)

b) A coil of 250 turns is wound uniformly over a wooden ring of mean circumference 500mm and uniform cross-sectional area of 400mm². If the current passed through the coil is 4A find (a) the magnetizing force (b) the total flux. (10)

Q5. (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)

Q6. (a) Explain how excitation of the rotor is produced and supplied. (6)

(b) A 25 kVA, single phase transformer has 250 turns on the primary and 40 turns on the secondary winding. The primary is connected to 1500 V, 50 Hz mains calculate: (10)

(i) Secondary emf

(ii) Primary and secondary current on full load

(iii) Maximum flux in the core.

Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)

(ii) Explain the operation of this valve (4)

(b) State the materials used for the seat and valve described in (a) (4)

Q6. (a) Describe the provisions of additional structural strength to withstand pounding. (6)

(b) A vessel travelling at 17 knots turns with a radius of 450 m when the rudder is put hard over. The centre of gravity is 7 m above the keel, the transverse metacentre 7.45 m above the keel and the centre of buoyancy 4 m above the keel. If the centripetal force is assumed to act at the centre of buoyancy, calculate the angle of heel when turning. The rudder force may be ignored. (10)

Q7. i) Explain the function of IMO as one of UN specialised agencies. (6)

ii) Briefly explain the structure of IMO including the main committees. (7)

iii) Explain the process of adopting a convention at IMO. (7)

Q6. (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)

Q7. 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)

Q7. (a) Why do you need an 'over-speed' trip despite a governor being fitted to a marine diesel engine? (8)

(b) With respect to an auxiliary engine governor, what is the significance of: (8)

(i) The Load limit knob

(ii) The compensation

Q7) The by-products of oxidation, as a result of water contamination of hydraulic oil are generally: (16)

(a) Removed by cellulose type filters

(b) Gums, varnishes, and acids

(c) Always neutralized by oil additives

(d) Harmless and have no effect on system components; Briefly justify your answer.

Q7. (a) Show by means of diagrams how the center of gravity of the liquid in a partly filled tank moves during rolling. (6)

(b) A box barge is 15 m long, 6 m wide and floats in water of 1.016 t/m³ at a draught of 3 m. 150 tonne of cargo is now added. Calculate the load exerted by the water on the sides, ends and bottom. (10)

Q7. a) State the conditions, which must be satisfied before an A.C generator can be paralleled with live bus-bars. (4)

b) Sketch a lamp-bright configuration for synchronizing lamps. (8)

c) State the advantages and disadvantages of the lamps-bright system over lamps-darks system. (4)

Q8. (a) Sketch and explain the operation of the Quick Closing Valve? (10)

(b) What do you understand by the Emergency Shutdown System? Explain the operation in an emergency. (10)

Q8. (a) Explain briefly how the different moving parts of a main engine are subjected to various stresses. (8)

(b) Name the stresses and justify by stating how they originate. (8)

Q8. (a) Explain what is meant by 'assigned summer freeboard' (6)

(b) A box-shaped vessel 60m long, 10m beam, and 6m deep, is floating in salt water at drafts 4m Forward and 4.4 m. Aft. Find how far forward of amidships a weight of 30 tonnes must be loaded if the draft aft is to remain at 4.4m. (10)

Q8. With reference to a three-phase shipboard electrical distribution system.

a) Enumerate the advantages of an insulated neutral system (4)

b) Enumerate the disadvantages of an insulated neutral system (4)

c) Compare the use of an insulated neutral system as opposed to use of an earthed neutral system with regards to the risk of electric shock from either system. (8)

Q9. Using a simple sketch, describe the fire main of a ship with which you are familiar. Include in your answer:

(a) The number and type of pumps (5)

(b) Material of the piping (5)

(c) Significance of the drain valve (5)

(d) Location of the international shore coupling (5)

Q8. (a) Describe maintenance required on auxiliary boiler burner. (8)
(b) Describe safety features provided on fuel burning system of auxiliary boiler (8)

Q6. Explain the following terms and give examples of where each condition might occur

a) Stress Corrosion cracking (6)

b) Creep cracking (5)

c) Corrosion fatigue (5)

Q9. (a) Explain why the TPC for a given draught will vary with the density of the water in which the ship floats. (6)

(b) A box shaped ship with 12m beam is floating upright at a draft of 6.7 m. Find the increase in draft if the vessel is now listed 18 degrees. (10)

Q9. a) Differentiate between resistance, induction and impedance in an a.c. circuit. (6)

b) A circuit is made up from resistors of value 2Ω, 4Ω, 5Ω and 10Ω connected in parallel. If the current is 8.6A, find the voltage drop across the arrangement and the current in each resistor. (10)

Q9. (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)

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)