DieselShip's Online Content Library

Q1. A. Sketch a transverse section through the hold space of a container ship hull;

B. Referring to the sketch in (A) describe how adequate structural strength is built into the hull.

Q8. With reference to a periodically unattended machinery space of a dry cargo vessel discuss the requirements for.

A. Protection against flooding.

B. Control of propulsion machinery from the navigating bridge.

Q1: Describe how the following conditions are prevented in auxiliary boilers:

A. Feed contamination by oil from heating coil drains.

B. Internal corrosion.

C. Furnace blowback.

D. Uptake fire.

Q1. A. Sketch a circuit diagram of a push button direct online contactor starter for a three phase Incorporating overload and short circuit protection.

B. Indicate, on a sketch of the typical characteristic curves of current and torque against Speed, disadvantages of a direct on line start squirrel cage induction motor.

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}

Q1. As second engineer onboard a tanker, describe the procedure for presenting a Main Boiler for survey by a classification society?

Q2. Describe the effect of the following on the ship’s stability;

A. Ice formation on superstructures

B. Effects of wind and waves

C. Changes that takes place during the ships voyage

D. Bilging of a compartment

E. While water is being pumped out from the dry dock.

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.

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. With reference to Marine Diesel engines:

(a) Describe how crankshaft alignment is checked.

(b) Identify with reasons the causes of crankshaft misalignment.

(c) State how the measurements are recorded.

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.

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?

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

Q2.A. Describe the arrangement of tank top and double bottom in the machinery space making particular reference to the structure and scantlings below the main engine.

B. Show the method adopted in the arrangement of D.B. tanks to avoid contamination of fresh water, fuel oil and lube oil stored in D.B. tanks.

Q1. (a) Explain how can the cooling spaces within a cylinder jacket be examined without withdrawing the cylinder liner?

(b) To what parts of a cylinder jacket would give attention after removing an old cylinder liner prior to fitting a new one?

(c) What periodic attention must be given to the scavenge air space and piston-rod packing (Stuffing box) at the bottom of a cylinder liner?

Q2. Tank liquid level sensors are an integral part of ships. Describe with aid of suitable sketches the working principle of,

(a) capacitive type level sensor;

(b) Ultrasonic level sensor;

(c) Float.

Q2. As a second engineer of a vessel, you are instructed to submit to the superintendent engineer a complete indicator cards together with relevant data. Give full account of your work in taking the cards and preparing them for submission. Tabulate the data you forward, both that extracted from the cards and otherwise obtained, giving typical figures taken from a motor ship.

Q1. With respect to Windlass and deck Machinery:

(a) Describe the principle of coil-operated brake suitable for winches and other deck machinery.

 (b) Explain with suitable sketches how the windlass is relieved of strain when riding at anchor.

Q4. (a) Sketch a line diagram of a mechanical low expansion foam fixed firefighting system suitable for machinery spaces.

(b) Describe the operation of the system sketched.

(c) Explain how a mixture of foam making compound and sea water are converted into foam.

Q1. With reference to International Load Line Statutory Certification,

A. State the reasons for the freeboard requirements;

B. (i) Explain the term “conditions of assignments”;

(ii) List the items that may be examined during a Load line survey after a vessel’s major repairs in the dry-dock.

Q4. With reference to steering gear hydraulic systems:

A. Explain the factors that could contribute to failure of connecting flange leading to total loss of oil from the system.

B. Describe an arrangement designed to ensure that the problem would not cause steering failure.

Q5. A. What are the causes of overheating of an induction motor?

B. What preventive measures are provided against damage to an induction motor in installed condition? C. What is the purpose of ‘fuse back up protection’ provided to an induction motor? D. How does an induction motor develop torque?

E. What is the condition to be satisfied for achieving maximum running torque in an induction motor?

Q4. A. State the laboratory tests that may be carried out on specimens of steel for ships’ plate giving reasons for the tests.

B. The basic compositions of two ships’ plates are given in Table below one is an example of modem practice whilst the other is a specification of a 1940’s tanker that split in two due to brittle fracture. Compare these two specifications critically and explain which of these two steels would be most resistant to brittle fracture

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

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.

Q1. Describe the background, relevance, and key features of the International convention on civil liability for Bunker Oil Pollution Damage, 2001.

Q5. With reference to alkaline batteries used on board ship.

A. Describe the operation of a battery cell and state the material used;

B. Describe how the cells are mounted to form a battery;

C. State the advantages and disadvantages compared with lead-acid batteries.

Q5. What examinations must be carried out when a crosshead bearing of a large, slow-speed engine is opened up for survey?

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

Q8. With respect to tankers describe

(a) How pump room and cargo tankers are ventilated.

(b) The main problem of carrying liquefied natural gas

(c) How the boil off from liquified natural gas is handled.

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

Q6. Explain the following terms/statements: -

A. Categories of Noxious liquid substance;

B. Special Areas as defined in MARPOL 73/78;

C. Water Ingress Detection and Alarm System in Bulk Carriers;

Q6. A. Describe the normal criteria used for setting thermal protection relays and its advantage compared to magnetic types.

B. The low-voltage release of an a.c. motor-starter consists of a solenoid into which an iron plunger is drawn against a spring. The resistance of the solenoid is 35 ohm. When connected to a 220 V, 50 Hz, a.c. supply the current taken is at first 2A, and when the plunger is drawn into the “full-in” position the current falls to 0.7 A. Calculate the inductance of the solenoid for both positions of the plunger, and the maximum value of flux-linkages in weber-turns for the “full-in” position of the plunger.

Q3: Your ship after having been accidentally grounded was taken to a dry-dock for inspection and necessary repairs. What defects would you look for in the following parts, that may have sustained damage due to grounding and suggest methods of repairs and tests that may be required to be carried out to the defects noticed:

A. Propeller and tail end shaft.

B. Main engine crankshaft.

Q7. With reference to medium speed engine cylinder liners:

A. Explain the cause and effects of Polishing or glazing;

B. Describe, with the aid of sketches, an anti-polishing ring and how it is fitted in the liner;

C. Explain the action of anti-polishing ring during the operation of the engine.

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. As a second engineer how will you plan to reduce the Energy Efficiency Operating Index of your ship?

Q10.A. Describe briefly the significance of the factor of subdivision.

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 centreline, 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.

Q 7. With reference to Synchronous Motors.

A. Draw and explain the principle of operation Synchronous Motors.

B. Find the synchronous impedance reactance of an alternator in which a given field current produces an armature current of 200 A on short circuit and a generated e.m.f. of 50V on open circuit. The armature resistance is 0.1 ohm. To what induced voltage must the alternator be excited if it is to deliver a load of 100A at a p.f of 0.8 lagging, with a terminal voltage of 200 V.

Q7. During the cleaning & inspection oily bilge tank onboard your vessel;

A. As second engineer, explain the procedure involved in transferring the water, emptying out tank, without violating MARPOL Regulation.

B. List the precaution to be taken before entering and while cleaning the progress.

C. Explain what all checks to be carried out, before and after cleaning.

Q7. With respect to large two stroke crosshead main engines;

A. Sketch and describe a crosshead designed to prevent or minimize bearing edge loading.

B. State how the arrangement describe a achieves its purpose.

C. What would be an acceptable range of bearing clearance for the top end bearing and bottom end bearings of a large two-stroke marine diesel engine.

Q7. A rudder of a vessel requires extensive welding repairs and as Second Engineer you are requested to supervise the repairs.

A.  Suggest a suitable type of welding process;

B. State, with reasons, FOUR common welding defects.

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

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

Q9. (a) Discuss International Maritime Organization (IMO) Data Collection System (DCS) for fuel oil consumption of ships covering following:

(i) Applicability of ship size (GT)

(ii) When the requirement of Data Collection System (DCS) entered into force;

(iii) What data required to collect ship;

(iv) The aggregated data is submitted to who and when (frequency) to submit;

(v) Relevance of SEEMP pertaining to Data Collection System (DCS)

(b) List out the main differences between the EU Monitoring, Reporting and Verification (MRV) regulation and International Maritime Organization (IMO) Data Collection System (DCS).

Q8. A. Sketch a transmission shaft coupling which enables the propeller shaft to be withdrawn outward.

B. (i) describe the coupling and method fitting and dismantling;

(ii) state how the grip of the coupling can be checked when fitted;

(iii) why should coupling bolts be interference fits

(iv) State what precaution should be taken when dismantling the coupling.

(V) State reasons why the metal that the intermediate and tail end remission shaft are made of.

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. 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.

Q5. With respect to refrigeration gases used on-board vessels, answer the following:

A. Explain Ozone Depleting Potential (ODP) and Global warming potential (GWP) of conventional refrigerant gases.

B. Name the alternate refrigerant gases available and being used onboard.

C. Explain the steps you will take to ensure that release of refrigerant gases from the plant in minimized during normal operation and during maintenance activities.

Q5. With respect to Air Starting systems for 2 stroke diesel engines:

A. Sketch a Main Engine starting air starting system and describe how it operates.

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

Q9. With respect to Inclining Experiments onboard vessels;

A. Sketch and Describe briefly the inclining experiment and explain how the results are used.

B. A forward deep tank 12 m long extends from a longitudinal bulkhead to the ship’s side. The widths of the tank surface measured from the longitudinal bulkhead at regular intervals are 10, 9, 7, 4 and 1 m. Calculate the second moment of area of the tank surface about a longitudinal axis passing through its centroid.

Q7. Under the new global limit, Ships using fuel oil on board with a sulphur content of no more than 0.50% m/m.

(a). List the challenges likely to be faced onboard in using fuel with a Sulphur content of no more than 0.50% m/m.

(b). What are the options in case a vessel is unable to get compliant fuel.

Q9. With respect to the operation of two stage reciprocating air compressor. Explain:

A. The causes of occasional lifting of 2nd stage relief valve.

B. Breakage of valve plates.

C. Puncture of bursting disc of 1st stage intercooler.

D. Noticeable reduction in capacity of the compressors over a period of time.

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?

Q9.  Reverse osmosis is one of the alternative method for shipboard production of drinking water.

(a)  Describe using simple diagrams if necessary,  the principle of reverse osmosis.

(b) (i) Sketch a line diagram showing a single pass system for producing fresh water from sea water

(ii) Describe such a system.

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.

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.