DieselShip's Online Content Library

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.

Q4. Prepare a proposal for safe manning requirements for a ship of your choice taking into account the IMO guidelines on the issue, also considering frequent port calls, rest hour management and high-risk areas.

Q1. (a) Sketch power circuit diagram for a star/delta starter and label it.

(b) Narrate the sequence of operation of the circuit sketched in Q1(a).

(c) Mention any two advantages of star/delta starter over direct online starter.

(d) State any two limitations of the star/delta starting.

Q5. As a second engineer, List out all the hazards identified with regard to cylinder head lifting job during main engine overhaul. explain how do you carry out risk assessment for above mentioned job.

Q1. (a) Explain the factors you would consider in deciding whether to open up a cylinder unit for overhaul? After opening the unit and preparing for assembly, how would you decide whether to renew or re-use piston rings?

(b) List the causes of piston ring failure which may result in gas leakage or ring breakage.

Q9. With reference to fatigue of engineering components:

A. Explain the influence of stress level at cyclical frequency on expected operating life.

B. Explain the influence of material defects on the safe operating life of engineering component.

C. State the factors which influence the possibility of fatigue cracking of an auxiliary boiler feed water pump shaft and explain how the risk of such cracking can be minimized.

Q2. (a) List SIX hazards associated with the carriage of liquefied gas in bulk.

(b) Sketch and describe the details of construction of a free standing prismatic tank within a gas carrier designed to carry liquefied gas (LPG)

Q3.  A vessel is due for International Oil Pollution Prevention Certificate renewal survey and company instructed to offer this vessel for survey at next port of call.

A. As a 2nd Engineer officer of above mentioned vessel, what all checks you carry out and how you prepare for the IOPP renewal survey.

B.  What records, procedures, certificates etc., you will keep ready for attending surveyor verification.

Q2.  Sketch a circuit diagram for an automatic voltage regulator illustrating how the A.V.R. utilizes a Silicon-controlled rectifier to control the excitation system for an alternator.

Describe how the A.V.R. monitors output and controls the excitation system.

Q2. Write short notes on following:

A. Magnetic Particle Inspection (MPI)

B.  Ultrasonic Testing (UT)

C. Radiographic Testing (RT).

Q1. Show with the aid of a sketch how fuel can be continuously circulated through fuel- injection valves on large engines while the engine is operating or under, stand-by conditions.

Q2. With reference to Flue gas Inert gas system:

A. Sketch a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers, labelling the component parts.

B. Describe the system.

C. State what oxygen content you would expect in the flue gases if good combustion is achieved.

Q4. With reference to Underwater Inspection in lieu of Dry  docking (UWILD)

A. Explain in detail, how an underwater survey is carried out;

B. State the requirements to be fulfilled before an underwater 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.

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.

Q3. Compare methods of obtaining speed regulation of three-phase induction motor generally used in tankers by means of:

A. Rotor resistance; B. Cascade system; C. Pole-changing.

Give examples where each system may be employed with advantage.

Q5. With reference to large two stroke engine:

(a) Explain how abnormal and excessive cylinder liner wear caused, state how it can be detected;

(b) explain the effects and consequences of excessive cylinder liner wear;

(c) explain how abnormal cylinder linear wear may be prevented.

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.

Q3. With reference to radial lip seals for propulsion shafting :

(a)  Describe, with the aid of a sketch, an outboard seal arrangement as fitted to an oil lubricated stern tube;

(b)  Explain, with reasons, the possible actions that should be taken in the event of loss of oil from the header tank.

Q2. With reference to a periodically unattended machinery space of a dry cargo vessel discusses the requirements for;

A. Protection against flooding;

B. Control of propulsion machinery from the navigating bridge.

Q5. In engine rooms that are operated under UMS conditions describe with the aid of sketches how the following are monitored:

A. The perforation of a high-pressure fuel pipe;

B. The imminence or possibility of a scavenge fire;

C. Condition that may be conducive to a crankcase explosion

Q4. (a) Explain with the aid of a diagram, a controller utilizing proportional plus integral action.

(b) List out the advantages and disadvantages of electric propulsion system.

(c) Explain briefly about “Pulse Width Modulation” and how it can be applied for propulsion control.

Q8. With respect to hydraulic Ram steering gears;

A. What emergency locking device can be used in order to speedily bring the steering gear to rest? State one reason the best angular position to lock the steering gear.

B. Use a simple sketch to show where the “Jumping” (top) and wear down (bottom) rudder carrier ring clearances can be measured. Indicate what clearances you would expect with a new steering gear;

C. State the consequences of the wear down clearances being reduced to less than Zero.

Q4. A. Explain the possible reasons T/C vibration while operating at a steady speed.

B. State how the incidence of turbo charger vibration might be minimized.

C. Explain the action to be taken in order to maintain 2 stroke engine operation in the event of turbo charger having to be taken out of service.

D. Indicate the effect this action will have on engine operation.

{How is the engine operation affected when operated with a by-passed T/C}

Q4. With reference to fuel oil viscosity:

(a) Explain why correct fuel oil viscosity is necessary

(b) Describe TWO methods for the measurements of viscosity that are suitable for the inclusion into a pneumatic or electronic control system;

(c) State, with reasons, a control action for a viscosity controller.

Q5. Explain how the period of roll varies with –

A. The amplitude of roll;

B. The radius of gyration;

C. The initial metacentric height;

D. The location of masses in the ship.

Q4. With reference to automatic sprinkler systems for fire fighting purpose:

(a) Explain, with the aid of a Heat Release versus Time diagram, the difference between fire control and fire suppression;

(b) State the limitations of using glass bulbs to activate sprinkler heads and suggest with reasons, an alternative mechanism.

Q3. (a) With the aid of a simple sketch, explain the “trouble spots” in a basic air-conditioning unit and with reference to your sketch, explain the following: -

(a). How the problem of increase in humidity of cooled air is overcome?

(b). How discomfort caused by the excessive drying effect of heated air is overcome?

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.

Q9. (a) Describe, with the aid of a sketch, a main engine hydraulically operated exhaust valve which is designed to rotate in service.

(b)Explain TWO methods how the opening of the exhaust valve described in part(a) can be controlled.

(c) Explain why the valve described in part (a) is rotated.

Q6. A. Sketch a line diagram showing the layout components of a hydraulic system with a variable delivery, Pressure compensated pump and accumulator, suitable for the operation of deck machinery.

B. Describe the operation of the system sketched in part 6 (a).

Q8: A. What is meant by the Admiralty Coefficient and the Fuel Coefficient?

B. A slip of 14900 tonne displacement has a shaft power of 4460 Kw at 14.55 knots. The shaft power is reduced to 4120 kW and the fuel consumption at the same displacement is 541 kg/h. Calculate the fuel coefficient for the ship.

Q3. With reference to SOLAS Ch-XII (Additional safety measures for bulk carriers);

A. Damage stability requirements for bulk carriers;

B.  Structural requirements for bulk carriers;

C. Water ingress alarms.

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;

Q6. (a). Explain the significance of the root- mean- square value of an alternating current or voltage waveform; Define the form factor of such a wave form.

(b). A total load of 8000 kW at 0.8 power factor is supplied by two alternators in parallel. One alternator supplies 6000 kW at 0.9 power factor. Find the kVA rating of the other alternator and the power factor.

Q6. With reference to large two stroke engine:

(a) Explain how abnormal and excessive cylinder liner wear caused, state how it can be detected:

(b) Explain the effects and consequences of excessive cylinder liner wear

(c)  Explain how abnormal cylinder liner wear may be prevented.

Q6. With reference to the fuel standards ISO-8217-2017 discuss the amendments made as compared to its previous edition. Explain the significance of the following:

(a) Pour point, cloud point and cold filter plugging point.

(b) Cat fines

(c) Fatty Acid methyl Easter

(d) Dissolved H2S in fuel.

Q7. A box barge 45 m long and 15 m wide floats at a level keel draught of 2 m in sea water, the load being uniformly distributed over the full length. Two masses, each of 30 tonne, are loaded at 10 m from each end and 50 tonne is evenly distributed between them. Sketch the shear force diagram and give the maximum shear force.

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.

Q8. Explain how EACH of the following hull defects should be dealt with;

(a) A cracked weld;

(b) A severe indentation in way of a frame;

(c) Surfaces suffering from general corrosion although the extent of wastage does not warrant plate replacement;

(d) A bilge keel fractured at the forward end.

Q8. A. What is back emf? Derive the relation for the back emf and the supplied voltage in terms of armature resistance.

B. A three- phase induction motor is wound for four poles and is supplied from a 50 Hz system. Calculate.

i. The synchronous speed; (4)

ii. The speed of the rotor when the slip is 4 per cent; (3)

iii. The rotor frequency when the speed of the rotor is 600 r/min. (2)

Q9. With regards to connecting rod ovality of four stroke diesel Engine.

Explain Following.

a) Importance of connecting rod ovality.

b) Method of measuring the connecting rod ovality.

C) Discuss the impact of ovality if it increases beyond the maximum allowable limit.

d) Method of ascertaining the elongation of connecting rod bolts.

Q7. With respect to Energy efficient running of ships;

(a) Sketch and explain the optimization of propeller hull interface flow devices and improvement of propulsion efficiency.

(b) sketch and explain the optimization of Auxiliary machinery using VFDs.

Q7. A. Describe stability requirement for dry-docking.

B. A ship of 8000 tonne displacement floats upright in seawater. KG = 7.6m and GM = 0.5m. A tank, KG is 0.6m above the keel and 3.5m from the centre line, contains 100 tonne of water ballast. Neglecting the free surface effect, calculate the angle which the ship will heel, when the ballast water is pumped out.

Q8. Your ship entering SECA zone, you have changed over from high sulphur to low sulphur fuel oil. On arrival Port State authority boarded your vessel and took sample and proved you have violated the relevant regulations of MARPOL regarding sulphur limits as prescribed. Write a statement, stating what the possibilities of are in correct change over process or incorrect sampling process.

Q4. A. As a second engineer, how often would you check holding-down bolts to ascertain that they are tight? What methods are used to check tightness?

B. If, soon after joining a ship, you found a number of holding down bolts slack, and fretting occurred in the areas of the slack bolts, describe how-you would handle the situation?

Q6. A 72 KVA transformer supplies a heating and lighting load of 12 KW at unity power factor and a motor load of 70 kVA at 0.766 (lagging) power factor; Calculate the minimum rating of the power-factor improvement capacitors which must be connected in the circuit the ensure that the transformer does not become overloaded.

Q1. Describe the starting and reversing system of an electronically controlled diesel engine and compare with engine having CAM SHAFT and explain the following;

A. Reduction in Air Consumption during Engine Starting;

B. Improved performance during Astern starting and Crash Astern

Q5. Sketch and describe the operation of a four ram electro-hydraulic steering gear system. Indicate and explain the valve positions for the operation of the system when one pump is isolated, and the unit is operating on two rams only.

Q8. A. Define longitudinal centre of gravity (LCG) and longitudinal centre of buoyancy (LCB).

B. The immersed cross-sectional area of a ship 120m long, commencing from aft are 2,40,79,100,103,104,104,103,97, 58 and 0 m2 calculate :

(i) Displacement;

(ii) Longitudinal position of the centre of buoyancy.

Q9. A. Sketch and describe a vacuum sewage system;

B. List the advantages of the system described in Q9(a).

C. State why untreated sewage should not be allowed to stagnate.

Q9. During normal engine operation, a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise -

A. State with reasons the possible causes.

B. Explain in detail how the engine might be safely operated if the damage caused by this incident is such that the turbocharger cannot function.

C. State with reasons the factors which may limit engine operating speed with the turbocharger out of operation.

Q7. A. By means of a schematic circuit diagram illustrate the peak rectifier. If the supply voltage is v(t) = Vm Sin wt, what is the voltage across the load resistor?

B. A battery-charging circuit is shown below in Fig. The forward resistance of the diode can be considered negligible and the reverse resistance infinite. The internal resistance of the battery is negligible. Calculate the necessary value of the variable resistance R so that the battery charging current is 1.0 A.

Q9. Write a report to the engineering superintendent regarding the replacement of the fuel injectors of three main engine units due to severe erosion of the nozzle holes and burning of the injector tips. Explain in your report how the defects were detected, the likely cause of the damage and the action taken to prevent further incidents of this type.

Q2. Cast iron is most widely used metal after steel in Marine Engineering. Most cast irons consist of graphite in steel like matrix. Discuss the variation of properties that may arise with reference to pearlitic grey cast iron and spherical grey cast iron. Describe briefly the treatment necessary to produce these two types of Irons.

Q9. The ½ ordinates of a water plane at 15m intervals, commencing from aft, ar. 1, 7, 10.5, 11, 11, 10.5, 8, 4 and 0m. Calculate:

(a). TPC;

(b). Distance of the centre of flotation from midships.

(c). Second moment of area of the water plane about a transverse axis through the centre of flotation.

Q10. A. Compare the effectiveness of a current limiting circuit breaker with that of a HRC fuse.

B. A coil having a resistance of 10 Ohm, and an inductance of 0.15 H is connected in series with a capacitor across a 100V, 50Hz supply. If the current and the voltage are in phase what will be the value of the current in the circuit and the voltage drop across the coil?