DieselShip's Online Content Library

Q1. A. Describe the preparation necessary before the application (in dry dock) of sophisticated or approved long life coating to the underwater surface of the hull;

B. State the significance of the roughness profile.

C. List the different sophisticated costing which are available.

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.

Q5. With reference to a three-phase shipboard electrical distribution system: A. Enumerate the advantages of an insulated neutral system; B. Enumerate the disadvantages of an insulated neutral system; C. Describe how the earthed neutral system is Earthed; D. Compare the use of an insulated neutral system as opposed to the use of an Earthed Neutral System with regard to the risk of electric shock from either system.

Q2. With reference to safety valves fitted to waste heat boilers: A. State with reasons the areas which should receive particularly close examination during a survey inspection; B. Describe the procedure you, as Second Engineer would adopt when setting such valves at sea; C. State the procedure to be adopted when reporting the setting of a waste heat boiler safety valve, to a classification society.

Q3: A. Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil outlet of the cooler; B. Explain why air supplied to the pneumatic control system must be free from dust and water; C. Describe how above impurities are removed; State the consequences if the air supplied is contaminated

Q8. Explain why the use of residual fuels for the operation of large slow speed or of medium speed engines, may be responsible for the following problems with turbocharger nozzles, shrouds and blades and how in each, the problem may be minimized:

A. Build-up of deposits.

B. Hot corrosion.

C. Erosion (16)

Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.

B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;

C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)

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.

Q5. A palm of the rudder of a vessel requires extensive welding repairs and as a Chief Engineer you are requested to supervise –

A. Suggest a suitable type of welding process;

B. State with reasons FOUR common welding defects that can occur there;

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

Q2. A. i.  Describe the characteristics of a d.c. motor. ii Explain the advantages of such a motor for deck machinery; B. Describe with the aid of a sketch a control system for the motor in (A).

Q9. A. With reference to the insulation testing of marine electrical plant: - I. State the reasons for insulation testing; II. State the precautions to be observed when testing intrinsically safe equipment. B. Describe the overhaul of d.c. motor which has been subjected to excessively damp condition or flooding with seawater.

Q2. The pipe work of the sea water circulation system for a passenger ship has to be completely renewed. The company contracted for the work has no previous experience of marine installation. You as the Second engineer have been requested to write the specification for manufacture and installation of the steel pipe; outline your proposal for manufacture of the pipe; State the necessary requirements for approval.

Q5: With reference to fatigue of engineering components explain the influence of stress level and cyclical frequency on expected operating life;

A. Explain the influence of material defects on the safe operating life of an engineering component;

B. State the factors which influence the possibility of fatigue cracking of a bed-plate transverse girder and explain how the risk of such cracking can be minimized.

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.

Q4. List at least two factors that cause deterioration of the frequency response of a transistor amplifier. Explain how each factor affects the performance of the amplifier and the portion of the frequency range where it is effective.

Q8. Explain in detail how you would isolate one of sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service.

Q8. Describe the method of setting the safety valves of an exhaust gas boiler at sea. A. State the limits in terms of percentage above maximum design working pressure for setting safety valves. B. State the formality necessary when Chief engineer sets the safety valves

Q2. Discuss the advantages and disadvantages of adopting the following for maintenance of main and auxiliary engines - A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components.

Q4: With regard to the carriage of crude oil and its associated products: i. Sketch and describe the operation of an explosimeter suitable for testing pump rooms or tanks; ii. State why false readings are likely to be given by the explosimeter. iii. State the publication that gives guidance on safety.

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.

Q8. Explain how each of the following conditions contributes to the satisfactory performance of oil centrifuges. A. Correct bowl speed; B. Cleanliness of bowl; C. Low rate of feed to the bowl; D. Contaminated oil preheated prior to centrifuging; E. Contaminated oil allowed standing for an appreciable time prior to centrifuging.

Q1. Differentiate with the aid of simple sketches between the following types of electronic circuits;

A. Rectifier circuit;

B. Amplifier circuit;

C. Oscillator circuit.

Q5. A. As 2nd Engineer describe the procedure involved in the complete inspection of a cylinder liner and piston assembly, indicating areas of significant interest; B. Explain with reasons possible faults which might be found; C. Suggest how such faults might be avoided.

Q2. With reference to the carriage and pumping of liquefied gas cargo:

A. Sketch a suitable pumping system labelling the component parts;

B. State;

i) Why submerged hydraulically driven pumps are not used;

ii) How overheating of pump drive shaft bearings is avoided;

C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.

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. For an expansion valve, us fitted in a refrigeration system, name operational that may cause a high pressure cut –out operate?

B. Describe the preventive maintenance schedule to avoid reoccurrence of this situation stated in.

Q3. A) Describe the circuit breaker for an a.c. generator using a sketch to show how arcing is Controlled.

(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.

Q9. Describe in detail the causes and conditions that; A. Create an explosive atmosphere in a crankcase; B. Initiate a primary explosion. C.  Propagate a secondary explosion; State how hazardous conditions can be avoided.

Q6. With reference to electro-hydraulic steering gears:

A. Explain in terms of control parlance, the function of the “Hunting gear”;

B. Explain the consequences if the standby pumping unit is motored;

C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.

Q6. a) Describe how the distribution of mass within the ship affects the rolling period. (6)

b) The righting moments of a ship at angles of heel of 0, 15°, 30°, 45°, and 60° are 0, 1690, 5430, 9360 and 9140 kN-m respectively. Calculate the dynamical stability at 60°. (10)

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.

Q8. A. What is meant by negative and positive feed backs? Explain the characteristics of negative feedback; B. Compare the series and parallel resonance circuits. Find the frequency at which the following circuit resonates.

Q6. A. Describe the survey procedure of an oil lubricated stern bearing and shaft. (8)

B. Explain how the integrity of the outboard seal of an oil lubricated stern tube may be proved before the dry-dock is flooded. (8)

Q9. a). If an auxiliary diesel generator over-speeds and runs away while off the load, explain: - i. How it can be stopped,

ii. What is likely to be the reasons for the failure.

b). Give-details of what cheeks are made after the machine has been stopped:

 (i) Mechanically,                            (ii) Electrically.

Q8. A. Explain the necessity of intercoolers on a multi-stage compressor. What attention is required to keep them safe and in good working order? Sketch and describe an intercooler suitable for a 2400kPa compressor and state materials used.

B. What attention is needed before opening up an air compressor for inspection?

C. What faults are likely to develop in an air compressor and how are they remedied?

Q7. A. Explain how to distinguish between list and loll and describe how to return the ship to the upright in each case. B. A ship 120m long has a light displacement of 4000 tonne and LCG in this condition 2.5m aft of midships.  The following items are then added:

Using the following hydrostatic data, calculate the fine draughts:

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?

Q3. State the regular routines carried out on the following system:  A. CO2, total flooding system of engine room; B. Smoke detection system; C. Sprinkler system.

Q10.  (a). Describe the no-load saturation characteristic of a d.c. generator.

(b). A 4-pole machine running at 1500 r.p.m. has an armature with 80 slots and 6 conductors per pole. The flux per pole is 6 x 106 lines. Determine the terminal e.m.f. of d.c. generator if the coils are lap connected. If the current per conductor is 100 A, determine the electrical power.

Q2. During a routine crankcase inspection a main engine top end bearing is found to be wiped and subsequent inspection shows that the pin is badly scored.

A. Explain in detail the action which should be taken to enable the engine to be safety operated so that the vessel may reach a port where effective repair facilities are available.

B. State with reasons the factors which influence the speed at which the engine may be safely operated.

Q8. Explain how the ingress of sea water is prevented in an oil lubricated stern bearing system. Should the system fail, describe the corrective action possible whilst the vessel is afloat. State why two stern bearing oil header tanks are fitted in some instances?

Q8. A. Explain the effect of trim on tank soundings. B.A ship of 6600 tonne displacement has KG 3.6m and KM 4.3m. A mass of 50 tonne is now lifted from the quay by one of the ship’s derricks whose head is 18m above the keel. The ship heels to a maximum of 9.5° while the mass is being transferred. Calculate the outreach of the derrick from the ship’s centreline.

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. What is slip? What are the factors on which the torque or an induction motor depends? B. A 220-V, 3-  4-pole, 50Hz, Y-connected induction motor is rated 3.73 KW The equivalent circuit parameters are: R1=0.45 , X1=0.8 , R2=0.4 , B0=1/30ohm. The stator core loss is 50W and rotational loss is 150W. For a slip of 0.04, find (i) input current (ii) p.f. (iii) air-gap power (iv) mechanical power (v) electro-magnetic torque (vi) output power and (vii) efficiency?

Q2.  A. As Second Engineer, outline your instructions to members of the ship’s engineering staff for inspection of the main engine timing chain; B. The inspection in A. has revealed that the roller chain needs replacement. Describe how this is achieved.

Q7. Sketch and describe a stockless anchor illustrating the method or device used to attach it to the chain cable. When the anchor and cable are ranged during the ships underwater survey what parts require special attention and what defects are likely to be discovered?

Q2. Sketch a Main Engine air starting distributor and describe how it operates.

List the safety devices and interlocks incorporated in main engine air starting system and state the purpose of each.

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.

Q9. A. Explain the effect on GM during the filing of a double – bottom tank, B. A ship of 8,000 tonnes displacement has KM 7.5m, and KG 7.0m.  A double bottom tank is 12 meters long 15 meters wide and 1 meter deep.  The tank is divided longitudinally at the centre line and both sides are full or small water. Calculate the list if one side is pumped on until it is half empty.

Q10. A. How does change to frequency affect the operation of the transformer? What makes this ratio different from the ratio of transformer? B. A 550 KVA, 50 Hz single phase transformer has 1875 and 75 turns in the primary and secondary windings respectively. If the secondary voltage is 220 V, calculate (i)Primary voltage; (ii)Primary and secondary currents; iii. Maximum value of flux.

Q9: A heavy Oil purifier vibrates badly when just shutting down and coming to a stop. Suggest some reasons for this vibration problem, when you have already made an inspection of its drive mechanism and casing and found nothing unusual.

Q7. With reference to the 4-stroke medium speed engines:

A. Define the cause and effect of thermal stressing in cylinder Heads, liners and pistons.

B. Explain why thermal stressing are aggravated with increase in cylinder bore.

C. Explain how stress concentration and its effects are relieved by maintenance and operational practices.

Q9. With reference to multi-tubular heat exchangers explain:

(A) How and where impingement attack is likely to occur in the tubes

(B) Why is it desirable that coolant flow rate should not exceed that required to maintain correct fluid temperature

(C) Ample well-shaped water boxes and smooth tube inlets are desirable

(D) Partial obstruction of tube bore is a common cause of tube failure

Q8. A ship of 9,900 tonnes displacement has KM=7.3 m and KG=6.4 m she has yet to load two 50 tonne lifts with her own gear and the first lift is to be placed on deck on the inshore side (KG 9 m and center of gravity 6m out from the center line). When the derrick plumbs the quay its head is 15m above the keel an 12m out from the center line.

Calculate the maximum list during operation.

Q7. A. Which of the following three motors has the poorest speed regulation: shunt motor, series Motor or cumulative compound motor? Explain.

B. A 440V shunt motor takes an armature current of 30A at 700 rev/min. The armature resistance is 0.7ohm. If the flux is suddenly reduced by 20 per cent, to what value will the armature current rise momentarily? Assuming unchanged resisting torque to motion, what will be the new steady values of speed and armature current? Sketch graphs showing armature current and speed as functions of time during the transition from initial to final, steady-state conditions.