DieselShip's Online Content Library

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. The fire protection provided for the propulsion motor and generator of a diesel electric drive vessel is usually one of the following methods:

a. Fixed foam extinguisher;                   b. Fixed CO2 system;

c. Steam smothering system;                 d. Dry Chemical Powder.

Briefly state in a comparative analysis, how each one of these methods has some disadvantages when used with propulsion system as stated above.

Q4. It is proposed to operate a bow thruster’s unit from a 3.3 KV electrical supply outline suitable option for the design of installation under each of the following heading. Protection of main switch board Overload of a bow thrusters motor Cable protection.

Q1. Suggest a procedure (in about 200 words) to the Chief Engineer, as to how you propose to ensure that the engine room overhead crane is maintained and operated correctly.  What tests certificates are required for the overhead crane, and who is the issuing authority.

Q1. Give that ignition quality of fuels bunkered at different may way; State how variation of fuel quality may be deterred during dieting engine operation; Describe a fuel pump arrangement, which will adjustment to compensate for variation of fuel quality; Explain the possible consequence of using fuel with good ignition quality without compensation.

Q1. In view of the number of fatalities involving inert gas used for firefighting purposes, your company is considering alternative methods of protection for the machinery spaces. As Second Engineer, compile a letter to the company expressing your views for the retention or rejection of inert gas systems and stating your opinion on viable alternative systems.

Q2. It is important to maintain the quality of lubricating oils in main and auxiliary diesel engines. A. Discuss critically the methods used to maintain crankcase oils on the various ships in which you have served. B. Drawing conclusions from (A) state, as second engineer, your preferred methods of maintaining crankcase oil quality.

Q5. With respect to Induced Vibrations in a ships hull:

A. State FOUR sources of excitation that may induce vibration into the main hull girder;

B. Suggest methods for reducing the vibration levels induced by EACH of the exciting forces in A.

Q4. Give a pragmatic approach to dealing with a sea water leakage, which is flooding the engine room and which has the potential of causing a serious impairment to a vessels stability.

Q2. Sketch a circuit diagram of an emergency generator power supply system suitable for passenger vessel: including in yours diagram the essential services supplied. With reference to an emergency generator stage - Its location; Methods of automatic starting; The time available for starting and connection of power to switchboard; Angles of heel and trim up to which it must be capable of operating; The length of time it must be cable of supplying emergency power

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)

Q2. Explain with the aid of sketches, the cycle of operation of either a free piston or an open cycle gas turbine installation. Discuss is advantages and limitations as the main means of propulsion on a ship as compared to conventional marine machinery.

Q4. A. Explain the causes of the formation of mill scale on steel plate. B. Describe the preparation necessary before the application of conventional paints to the underwater surface of the hull; C. Describe a coating scheme for the underwater hull using conventional paints

Q6. With reference to an automatic water sprinkler, fire detecting alarm and extinguishing system for accommodation spaces: -

A. (i) Sketch a typical system;

(ii) Describe the operation of this system;

B. State the sources of water available;

C. Describe the sprinkler head and its operation;

D. State how the temperature rating of the sprinkler head is determined.

Q4. Explain the effect of reduced voltage on standard squirrel cage motors with respect to EACH of the following:

(i) Burn out; (ii) Starting current; (iii) Starting torque; (iv) Speed.

Q7. Fatigue is one of the main causes of crankshaft failure - A. Indicate on a sketch the most likely location of a fatigue crack; B. Explain how a fatigue failure is identified; C. Describe how a fatigue crack may be initiated; D. Describe, with the aid of sketches, the methods used to inhibit fatigue cracks.

Q9. A. With the aid of a block diagram describe the operation of an electronic governor fitted to an auxiliary diesel engine. B. An engine fitted with an electronic governor during load changes. Explain the possible causes.

Q3. 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 coatings which are available.

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.

Q7. Which legislation is framed at preventing the emission of black smoke, sets the limits on the length of time of such emission?

A. Discuss the reasons for setting time limits rather than imposing a complete ban on emission

B. State why different times are quoted, giving examples.

C. State the likely constituents of black smoke from the combustion of residual fuel in a boiler.

D. List the contaminants likely to be found in the clear exhaust from a diesel driven alternate burning gas.

Q2. A. State the necessary conditions required prior to the synchronizing of electrical alternators.

B. Describe the type of cumulative damage that may be caused when alternators are incorrectly synchronized;

C. Explain how the damage referred to in (b) can be avoided / reduced.

D. For two alternators operating in parallel state the consequences of:

(i) Reduced torque from the prime mover of one machine.

(ii)Reduced excitation on one machine.

Q9. What are the effects of following on the sluggishness of steering gear operations;

A. Air entrapped in hydraulic oil;

B. Worn pins and weak springs in hunting gear;

C. Shock valves leaking

Q4. Make a diagrammatic sketch of one unit of sulzer engine of the cross-head type showing the arrangement of the cylinder ports. Describe briefly the arrangement and explain how scavenging is affected

Q1. A. State the standing instruction you, as Second Engineer, would issue with respect to the action to be taken in the event of a boiler uptake fire; B. State how the incidence of uptake fires may be minimized; C. State the reasons for blow – back from the furnace of an auxiliary boiler; D. State the standing instruction you, as Second Engineer would issue with respect to the avoidance of boiler furnace blow – back.

Q5. A ballast tank is one third full when additional ballast is added until it is two thirds full. The increased amount of liquid in the tank will have the greatest influence on the. Free surface effect; Transverse stability; Virtual rise in the center of gravity; Value of the moment to trim 1 inch (MTI). Give a detailed explanation stating why the other options were not considered.

Q5. With reference to an oil/water separator:

A. (i) Sketch such a device; (ii) Describe the passage of oil/water mixture from the delivery of pump to the outlets of separator.

B. State how oil density and temperature affect the case of separation of oil from water.

C. State how the movement of oil on board ship or its discharge and the discharge of oily-bilge ballast water overboard is recorded.

Q2. Sketch and describe an arrangement for automatic connection of emergency batteries upon loss of main power. Include in your answer:

A. Means of obtaining D.C. charging supply from a.c. mains;

B. A method of maintaining charge on lead acid batteries;

C. The arrangement to check that a battery operates a loss of main power

D. The length of time for which emergency batteries of passenger and cargo ships must provide power.

Q7. Briefly describe your action plan on following exigencies:

A. Leaky economizer tube, while at sea;

B. Leaky intercooler of main air compressor, while manoeuvring.

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

Q5.A. Sketch a watertight door and frame showing the manner of attachment to the bulkhead and the additional reinforcement carried by the bulkhead to compensate for the aperture.

B. Explain how water tightness of the door and frame mating surfaces is ensured with hydrostatic pressure tending to force the faces apart.

C. (i) Describe the means of closing the door;

(ii) State the number of closing stations and the position of each.

Q6. A ship 90 m long displaces 5200 tonne and floats at draughts of 4.95m forward and 5.35 m aft when in sea water of 1023 kg/m3. The water plane area is 1100m2, GML 95m, LCB 0.6m forward of midships and LCF 2.2m aft of midships. Calculate the new draughts when the vessel moves into fresh water of 1002 kg/m3

Q3. Name various statutory Certificates and Documents to be carried on board Gas Tankers giving reference to the conventions and justify for their requirement.

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.

Q4. Discuss the validity of EACH of the following statements with respect to large slow speed diesel engines: A. Bearing clearances obtained by taking leads (or use of plastic inserts) are fundamentally more accurate than those obtained with the use of feelers;

B. Bearing wear down can be measured by taking deflections; C. A timing chain should be renewed when its slackness causes late fuel injection and exhaust valve operation; D. Timing chain slackness is solely due to stretch of the link plates.

Q6.  Discuss the importance of correct cylinder lubrication in a large diesel engine, explaining the possible consequences of both over and under lubrication.  Describe the qualities required in a cylinder lubricant for use in an engine burning high viscosity (heavy) fuel oil.  Comment on the timing of the injection of the lubricant in relation to the working cycle of the engine. Changes, if any, in the quality of the cylinder lubricating oil used for a large arrange diesel engine, with the imposition of Annex IV of MARPOL

Q6. Sketch and describe a system for oil monitoring of bilge and tanker ballast discharges. What inputs are recorded? Explain the difficulties encountered with the efficient operation of the oil monitoring system.

Q3. Explain the principle of port State control and give in detail the verification the Port State Control Officer may carry out with particular reference to the following;

A. Emergency generator; B. Auxiliary steering gear; C. Lifeboat engine; D. Bilge pumps; E. SOPEP.

Q10. The daily fuel consumption of a ship at 17 knots is 42 tonne. Calculate the speed of the ship if the consumption is reduced to 28 tonne per day, and the specific consumption at the reduced speed is 18% more than at 17 knots.

Q7. It is found that the tie rods are persistently becoming slack: A. State, with reasons, the possible causes; B. State, with reasons, the likely effects on the engine if it is allowed to operate with slack tie rods; C. Explain how this problem can be minimized?

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.

Q8. With reference to bottom end bolts for medium speed four stroke engines:

A. Explain why bottom end bolts will ultimately fail under normal operating conditions;

B. Identify the features incorporated into bolt design to inhibit failure;

C. Explain how bolt failure may be hastened when maintenance is carried out;

D. Describe, as Second Engineer, your strategy for preventing bolt failure.

Q7. How does the cargo pumping system of a product carrier differ from that of an oil tanker? Sketch the cargo pumping system of a product carrier.

Q8. A. Explain the principles underlying the STCW Convention; B. Explain how as a senior engineer you would implement the regulation for controlling and monitoring of minimum hours of rest for watch keepers; C. What type of specific shipboard familiarization is required to be given? D. List the areas in which training is required and areas it is desirable.

Q8. A ship 160m long and 8700 tonne displacement floats at a waterline with

While floating at this waterline, the ship develops a list of 10° due to instability. Calculate the negative metacentric height when the vessel is upright in this condition

Q8. A. What is slip? What are the factors on which the torque or an induction motor depends?  B) Calculate the pitch factors Kp for a wiping having 24 stator slots, 4 poles, when the coil span is 1 to 6

Q9. A. State the common causes of scavenges fires; B. List the indications that a scavenge fire is in progress; C. State the immediate action to be taken in the event of a scavenge fire; D. List with reasons the checks and precautions necessary before an engine is put back into service following a scavenge fire.

Q8. Define the term fatigue as applied to engineering components. Explain how fatigue failure is influenced by the presence of slag in welds; Define the term residual stress and explain how this can influence the fatigue life of a component; During a crankcase inspection, a crack has been discovered in the lower section of a bed plate transverse girder. Explain the action you, as Chief Engineer, would take to ensure safe operation the engine if facilities to repair the damage were not immediately available.

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

Q9. A. Describe briefly the inclining experiment and explain how the results are used. B. A ship of 8500 tonne displacement has a double bottom tank 11m wide extending for the full breadth of the ship, having a free surface of seawater. If the apparent loss in metacentric height due to slack water is 14cm, find the length of the tank.

Q9. A. State the instructions you as Second Engineer will give to watch keepers with respect to boiler uptake fire;

B. State how the incidence of uptake fires may be minimized.

C. State the reasons for blow-back from the furnace of an auxiliary boiler.

D. State the standing instructions you might have received from your Chief Engineer With respect to the avoidance of boiler furnace blow-back.

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. Explain how oil carries over occurs in starting air compressors; B. State how the problems of oil carry over are minimized; C. State THREE factors that contribute to air start line explosions in diesel engines.

Q6. A. A number of main engine cylinder covers have been subjected to cracking during the preceding four months –

i. Explain possible reasons for this cracking;

ii. State with reasons the action you, as Second Engineer, would take in order to reduce the possibility of future cylinder cover cracking.

B. Cylinder liner wear has increased appreciably during the past six months. Write a brief report to the engineering superintendent concerning this matter explaining the possible causes the immediate action taken to deal with the problem and the action you, as Second Engineer, intend to take in order to reduce the risk of future incidents.

Q8. A. Explain the action of EACH of the following metallurgical mechanism:

(i) Creep;          (ii) Brinelling;   (iii) Fretting;     (iv) Fretting corrosion;

B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.

Q10. The end bulkhead of the wing tank of an oil tanker has the following widths at 3m intervals commencing at the deck: 6.0, 6.0, 5.3, 3.6 and 0.6 m. Calculate the load on the bulkhead and the position of the centre of pressure if the tank is full of oil rd 0.8.

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.