DieselShip's Online Content Library

Q4. A. Describe a method of the attachment of bilge keels;

B. State THREE reasons for not extending bilge keels the entire length of the vessel;

C. Evaluate the effectiveness of bilge keels for large wall sided vessels;

D. Explain TWO principles of roll damping those bilge keels exploit.

Q8. Explain in detail a fixed gas fire extinguisher system, indicating the quantity of the fire-extinguishing medium, the controls required for the system, installation requirements and training required to bring the system to be readily operated.

Q6. With regard to keeping the gas side of boilers in good condition discusses EACH of the following:

A. the mechanism of combustion, stating the factors which are important to good combustion;

B. Oil fuel treatments;

C. Soot removal equipment;

Q1. With reference to the provision of a shore electrical supply to a ship:

A. Sketch an arrangement for taking A.C. shore supply and checks to be carried out prior taking shore connection?

B. Describe the method of safely connecting the arrangement sketched in (A) to the shore Supply?

Q1. During a loaded sea passage an unusual noise followed by excessive vibrations were experienced in the engine room of your vessel while she was underway. Vessel is fitted with a four-bladed propeller directly coupled to a 2 stroke Diesel engine. Engine room is located aft. After preliminary investigation and from the engine parameters, you have come to the conclusion that propeller has sustained damage. Write a letter to your company reporting this incidence and justification for your conclusion suggesting future course of action.

Q5. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension.

Q1. With reference to membrane tanks for the carriage of liquefied gas at very low temperatures. A. Describe with a sketch one method of building up the insulation; B. State which alloy is used for the membrane and the reason; C. Describe with the aid of a sketch, how the tanks are located and supported. i) Longitudinally; ii) Transversely

Q2. In the event of a failure of the main electrical power supply on a ship, an emergency source of power must be available.  State the circuits which must be fed from such a source and discuss the reasons governing the selection of such circuits.

Q7. A. Explain in detail how an in-water survey is carried out; B.  State the requirements to be fulfilled before an in-water survey is acceptable to the survey authority; C. Construct a list of the items in order of importance that the underwater survey authority should include.

Q2. With reference to U.M.S. operations:

A. State with reasons the essential requirements for unattended machinery spaces;

B. As second Engineer, describe how you would respond to the irretrievable failure of the Machinery space fire alarm system whilst the ship is on voyage.

Q4. During routine soundings, it is found that leakage into a cofferdam is occurring from an adjacent deep cargo oil tank. As Second Engineer state the procedure for directing safe entry by the engine room staff to ascertain the cause of the leakage. If the leakage persists, discuss EACH of the following options as a possible remedy: i) Leave the cofferdam to flood with oil (ii) Flood the cofferdam with sea water (iii) Seal the Cofferdam and pressurize with air (iv) Pump the leakage to bunker tanks.

Q4. With reference to Main engine piston rings:

(a) Analyze the causes of piston ring breakage.

(b) How maintenance and engine operation can minimize piston ring breakage.

(c) Explain the possible consequences with respect to performance and safety of operating the engine with broken or severely worn piston rings

Q1. Discuss, with reference to the superheater outlet temperature of the main boiler operating at a constant load, the following statements:

a) An increase in excess air will tend to cause a decrease in superheater outlet temperature due to the cooling effect of more air being introduced.

b) A decrease in economizer inlet temperature will tend to cause a decrease in super heater outlet temperature due to the cooling effect of more water being introduced.

c) Badly fouled generating tube banks will cause an increase in the super heater outlet temperature.

d) Excessive amounts of total dissolved solids in the boiler water will cause variations in the super heater outlet temperature

Q2. State how and why the following machinery items are effected when the maximum service speed of a Vessel is consistently maintained in heavy weather.

A. Intermediate shafting,

B. Propeller shafting,

C. Shafting coupling bolts,

D. Main thrust pads.

Q3. Direct on line starting for large induction motors such as those for bow thrust units, may not   be viable. A. State the reasons for this; B. Sketch a starting system that may be used for such motors; C. Describe the starting method sketched in B.

Q6. With respect to the hazardous areas of tankers,

A. Explain the term flameproof (Ex d) for electrical equipment;

B. State the type of electrical equipment that would be protected in this way.

C. List likely defects of flameproof equipment.

Q3. You have recently been appointed second engineer of a vessel and have experienced problems associated with the operation of the oily water separator.  Make a report to the company explaining the nature of the problem and suggesting possible remedies.  Assume a slop tank is available for retaining bilges until the vessel reaches port.

Q8. With reference to main boiler super heater arrangements:

(a) Compare the advantages and disadvantages of contra flow with parallel flow design.

(b) How the element tube bank is supported and yet allow for expansion?

(c) How boiler carryover affects super heater effectiveness?

Q1. A. Sketch the cross-section of a bulk carrier with either deep or shallow double bottom showing the type of framing used;

B. Describe the corrosion problems experienced with ballast tanks;

C. state how such tanks are protected against extensive corrosion.

Q6. A. Describe a vacuum sewage system;

B. With reference to the system described in (A) - i. State ONE advantage of the system;

ii. State why a holding tank may be required to be fitted to the system;

iii. State the problems resulting from the retention of untreated sewage in a holding tank.

Q4. A. In a.c. generators, voltage dip occurs in two stages.

I. Sketch a voltage-time graph showing the pattern of voltage dip.

II. Referring to this graph, state with reasons the effect on the electrical system of a small power installation when a large load is suddenly switched on.

B. Explain EACH of the following categories of voltage control:

(i) Error operated; (ii) Functional.

Q6. With reference to the circuit breaker for an a.c. generator A. Describe the preventive maintenance carried out on the circuit breaker for an A.C Generator. B. Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would require following such event. C. Give a safe procedure to follow should a main circuit breaker fail to open under fault condition.

Q4. It is noted in engines burning heavy fuel that the top of the piston crown may waste and gradually burn away.  What is done to rectify this condition?

Q6. With reference to hydraulic system for deck machinery identify: A. The types of contamination likely to be found in hydraulic systems for deck machinery; B. The sources of such impurities; C. Means used to prevent problems with contamination; D. Possible effects of the oil contamination on the system.

Q3. With regard to ship construction details for transverse watertight bulkheads: -

A. State the purpose of this type of bulkhead;

B. State how the bulkheads are tested for water tightness;

C. If it is necessary to penetrate the bulkhead, precaution must be taken to ensure that the watertight integrity and the strength of the bulkhead is maintained. In view of above, describe, using simple sketches, how the following pass through bulkheads.

i. Main transmission shaft;                ii. Electrical cables;

iii. Fuel oil transfer pipes;                iv. Air and sounding pipes.

Q9. A) As Second Engineer of a new ship, prepare standing orders for all future bunkering operations;

B.  State why it is very important to obtain a representative sample of heavy fuel bunkers taken and explain how a representative sample is obtained

C. What information is provided in bunker Delivery note (BDN).

Q5. A. Which of the following devices will prevent a DC generator from becoming motorized? i. Over current relay; ii. Motorization trip; iii. Reverse power relay;  iv. Reverse current relay. B. Give a detailed explanations as to why other options were not considered.

Q9.A.Discuss the possible problems associated with air compressors which operate automatically; B. State the standing orders you, as Second Engineer, would issue orders regarding the maintenance and safe and efficient operation of air compressors; C. Outline any problems common to air receivers in machinery space/ship compressed air systems.

Q9. If a main engine piston seizes in its liner at sea and it is not possible to replace the unit, explain, in detail, what provisions are made in the engine, to enable the ship to reach port?

Q3. Sketch and describe a cargo space inert gas system producing washed gas from either a main boiler or from an independent gas generator module. Elaborate the alarms and cut-outs incorporated in the system to prevent any accident.; Explain the various protections for cargo tanks with respect to pressure vacuum build up inside the tanks.

Q6. With respect to MARPOL 73/78, Annex - II, Noxious liquid chemicals are divided into categories; A. State the number of categories, and what does each category signify. B. State the requirement of Procedures and Arrangements Manual, and what information is available.

Q6. A. Describe how water tightness is maintained where bulkheads are pierced by longitudinal beams or pipes.

B. A triangular bulkhead is 7 m wide at the top and has a vertical depth of 8 m.  Calculate the load on the bulkhead and the position of centre of pressure if the bulkhead is flooded with sea water on only side:

(i) to the top edge,               (ii) with 4 m head to the top edge.

Q5. A. Differentiate between series and parallel resonances. Draw impedance characteristics of these circuits. B. A 2,000-K VA, 3-phase, 8-pole alternator runs at 750 r.p.m in parallel with other machines on 6,000 V bus-bars. Find synchronizing power on full-load 0.8 p.f. lagging per mechanical degree of displacement and the corresponding synchronizing torque. The synchronous reactance is 6 ohms per phase.

Q6. With reference to hull cathodic protection systems of the impressed current type: Sketch and describe such a system; Explain how protection may be ensured for the rudder and propeller; State any precautions that should be taken when this type of system is installed

Q1. Describe with the aid of sketches an arrangement for operating the fuel valve of a heavy oil engine. Explain how the timing is affected and the supply of fuel regulated to suit varying load.

Q4. W.R.T lubrication of reciprocating Freon refrigerating compressor, A. State with reason the characteristic of the lubricating oil in use in such a system, B. Discuss each of the following W.R.T., Cause effect and remedy - i. Copper plating; ii. Freon cloud point; iii. Freon floc point; C. Sketch a ship indirect refrigeration system arranged for cooling containers stowed in stacks in the hold.

Q7. A. Distinguish between ships of Type “A” and Type “B” for the purpose of computation of free board, B. The draughts of a ship 170m long are 6.8.5 m forward and 7.50m aft MCTI cm 300 tonn m; TPC 28; LCF 3.5m forward of midships. Calculate the new draughts after the following changes in loading have taken place. 160 tonne added 63 m aft of midships; 200 tonne added 27m forward of midships; 120 tonne removed 75 m aft of midships; 70 tonne removed 16 m aft of midships

Q7. As Second Engineer of a ship, what steps you will take to familiarize the engine room staff with their respective duties and also to combat an emergency on board?

Q7. A. Distinguish between power efficiency and all-day efficiency. Why is all-day efficiency considered more reasonable basis for comparison than ordinary efficiency? B. The no-load current of a transformer is 5.0 Amps, power factor 0.25 when supplied at 235 V, 50 Hz. Turns on the primary winding is 200. Calculate A. the maximum value of flux in the core, B. the core loss.

Q7. What are the routine maintenance carried out to an a.c. motor; and- A. Explain the meaning of single phasing in a.c. machinery; B. State the dangers associated with single phasing and enumerate the protective normally fitted to counteract such dangers.

Q2: What is the difference between “pulse”, and “constant pressure” turbo-charging as applied to a compression ignition engine?  Sketch and describe one of these systems. What additional air charging arrangements may be provided for use when the main engine is being started at low speeds?

Q1. With reference to oil / water separators: A. Describe, will the aid of a sketch, the circuit for an interface detector; B. Explain the consequences if the interface position is incorrect.

8. When a ship is 800 nautical miles from port its speed is reduced by 20%, thereby reducing the daily fuel consumption by 42 tonne and arriving in port with 50 tonne on board. If the fuel consumption in t/h is given by the expression (0.136+0.001 V3) where V is the speed in knots, estimate:(i) The reduced consumption per day; (ii) The amount of fuel on board when the speed was reduced(iii) The percentage decrease in consumption for the latter part of the voyage;(iv) The percentage increases in time for this latter period.

Q8. You have joined a vessel as a Second Engineer, which is about to undertake a six-month round voyage. Describe the key issues that you will attend and provide guidance to juniors towards proper Planned Maintenance of Engine Room and associated areas under ISM Codes.

Q8. A biological sewage system develops a fault, which necessitates opening the unit for repair. The risk associated with opening the unit; The precaution taken to reduce the risk; Explain the significance of biological oxygen demand B.O.D.)

Q8. A. What is a commutator? Discuss its rectifying action in detail.

B. Calculate the e.m.f. generated by a 4-pole, wave wound armature having 40 slots with 18 conductors per slot when driven at 1000 r.p.m. The flux per pole is 0.015 wb.

Q8. With the aid of a block diagram describe the operation of an electronic governor for an internal combustion engine; State THREE problems to which such a governor is prone and explain how EACH becomes evident; In the event of the governor on a direct drive engine becoming inoperative state the action you, as Second Engineer, would take in order to ensure safe operation of the engine.

Q8. A.  Describe a vacuum sewage system B. With reference to the system describe in (A): i. State ONE advantage of the system; ii. State why a holding tank may be required to be fitted to the system; iii. State the problems resulting from the retention of untreated sewage in a holding tank

Q2. With reference to classification society’s survey, explain the following

A. Why a Class certificate is issued to a newly built ship after satisfactory completion of survey and sea trials, what is the purpose of a Class certificate?

B. Is it necessary to call a Class surveyor after repair or alteration to the ship’s structure If so, why?

C. Describe the requirement for initial and periodical survey respect to International Load Line.

Q8. A. Describe the fundamental principle of a propeller. B.A propeller 6m diameter has a pitch ratio of 0.9, BAR 0.48 and, when turning at 110 rev/min, has a real slip of 25% and wake faction 0.30. If the propeller delivers a thrust of 300 KN and the propeller efficiency is 0.65. Calculate - i Blade area; ii Ship speed; iii. Thrust power; iv Shaft power v. Torque

Q9. With regard to a U.M.S. ship having an automatic fire detection system for the machinery space,

A. Sketch a line diagram of the system showing how shipboard mains supply is fed through battery charger and emergency battery to fire detector heads and fire zone indicator panel and alarms.

B. In the event of a mains supply failure state the length of time for which the emergency battery should be capable of operating the system.

C. Sketch and describe a line termination or method of monitoring the integrity of the system

Q9. A. Discuss different methods of speed control of a d.c. series motor by adjusting field ampere turns.

B. A 230 V, d.c. shunt motor runs at 1000 r.p.m and takes 5 amperes. The armature resistance of the motor is 0.025𝛀 and shunt field resistance is 230𝛀. Calculate the drop in speed when the motor is loaded and takes the line current of 41 amperes. Neglect armature reaction.

Q9. Sketch and describe the motor of a turbo-charge a showing the gloands arilized to ensure air and gas tightness. Discuss the consideration leading of suitable motor bearings, how the bearings may break down in sewage

Q9. With reference to an emergency source of electrical power in passenger ships: - i. Describe a typical power source; ii. Give a typical list of essential services which must be supplied simultaneously; iii. Explain how the emergency installation can be periodically tested

Q9. A. Describe measures which may be taken to improve the stability or trim of a damaged ships.

B. A ship 85m long displaces 8100 tonne when floating in seawater at draughts of 5.25m forward and 5.55m aft. TPC 9.0, GML 96m, LCF 2m aft of midships. It is decided to introduce water ballast to completely submerge the propeller and a draught aft of 5.85m is required. A ballast tank 33m aft of midships is available. Find the least amount of water required and the final draught forward.