DieselShip's Online Content Library

Q1. What statutory certifications need to be carried by an Indian flagged container vessel? Name the certificates and state the validity of each of the certificates. (20)

Q1. With Respect to a turbocharged 2-Stoke Main Propulsion Diesel Engine:

a. What is the purpose of Auxiliary Blower.

b. What are the safeties provided for the scavenge air receiver.

c. Why do we require scavenge air cooler?

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.

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 Rating has been seriously injured by a "blow back" from the oil fired auxiliary boiler. As Second engineer, make a full report to Head office explaining the circumstances of the incident and the precautionary measures now taken to reduce the possibility of a similar occurrence in the future. (16)

Q2. a) Define creep and specify the conditions under which it occurs? (8)

b) Discuss the various metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (8)

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Q2. a) Define creep and specify the conditions under which it occurs? (8)

b) Discuss three metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (8)

Q3: With reference to dry docking, define the responsibility of the second engineer;

A. Prior to docking;

B. Whilst the vessel is in dry dock;

C. Prior to flooding and leaving the dock.

Q2. Write a report to your Engineer Superintendent describing a breakdown of the main refrigerating plant for cargo or ship provision giving reasons for the breakdown, the method of repair and the action taken to prevent a recurrence.

Q3. a) What are the advantages of thin shell bearings over white metal bearing used in marine diesel engines?

b) How are the thin shells prevented from rotating inside the bearing cage when the engine is running?

c) What is importance of axially locating the thin shell bearing and how it is done?

Q1. With reference to Statutory Certification:

a) State the reason for the freeboard requirements. (8)

b) (i) Explain the term conditions of assignments. (4)

(ii) List the items that may be examined during a related survey. (4)

Q3. With reference to a tubular heat exchanger, state the various types used on board a ship and explain with sketches how the construction, flow pattern, baffles, differ from each other depending upon the medium in use. (16)

Q5. With respect to Refrigeration systems uses onboard:

a) How do we choose environmentally friendly refrigerants for ships? (6)

b) How do CFC’s, HCFC’s, HFC’s and natural refrigerants like ammonia and carbon-di-oxide compare in terms of ozone depletion (ODP) and global warming potential (GWP)? (4)

c) What are the benefits and challenges of using natural or low-GWP refrigerants on marine vessels? (3)

d) 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. (3)

Q1. State how and why the following machinery items are affected when the maximum service speed of a vessel is consistently maintained in heavy weather. (16)

a) Intermediate shafting

b) Propeller shafting

c) Shafting coupling bolts

d) Main thrust pads.

D. Main thrust pads.

Q4. A. During the weighment of CO2 bottles required for total flooding of Engine room, it was observed that few bottles are less than the original capacity. State the reasons for the same and checks / tests to be made prior refilling. (8)

B. State how often the CO2 bottles are required to be weighed and pressure tested. (8)

Q5. With respect to a 2- stroke main propulsion diesel engine starting air system.

a) Explain the starting air overlap?

b) What is the starting air timing for one cylinder?

c) What is slow turning arrangement and what is the purpose?

Q2. a) Describe the arrangement made in a main structural bulkhead for a watertight door aperture. (5)

b) Explain a procedure for ensuring that sliding watertight doors are operated safely. (5)

c) Differentiate between the categories of watertight door and state the regulation pertaining each type. (6)

Q5. During the past four months since you joined the ship as Second engineer a number of main engine exhaust valve have suffered from cracking and corrosion at the seating faces. Write a report to the Superintendent Engineer covering the following points:

A. An explanation detailing how the problem becomes evident.

B. Your action upon recognizing the extent and seriousness of the problem.

C. Your reasoned view regarding the possible causes of the problem.

D. Your recommendations to avoid future incidents.

Q5. With reference to U.M.S. operation:

A. State with reasons the essential requirements for unattended machinery spaces. (8)

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. (8)

Q5. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down. (6)

B. State how the vanes described in (A) are secured and the method of sealing the edges. (5)

C. State how, if necessary, the steering gear is locked for rudder maintenance. (5)

Q6. With respect to fuel injection system of diesel engines,

a) What is the purpose of VIT?

b) How is the end of injection controlled in a 2 stoke propulsion engine and 4 stroke medium speed auxiliary engine?

c) Explain the purpose of a draw card.

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. A. What are factors on which the speed of a motor depends? Discuss them for series and shunt motors. (6)

B. A shunt motor supplied at 230 V runs at 900 rpm. When the armature current is 30 A, the resistance of the armature circuit is 0.4 𝛀, calculate the resistance required in series with the armature circuit to reduce the speed to 500 rpm. Assume that the armature current is 25 Amps. (10)

Q6. With reference to marine gearing and gearbox.

A. Why the first examination after commissioning is of special importance.

B. What part would receive the closest scrutiny and what defects might possibly be found.

C. The gearing faults that are likely to develop early in the life of the vessel.

Q6. A. Describe with the aid of a sketch, the main engine ancillary equipment for automatic monitoring and regulation of fuel viscosity. (6)

B. Explain the operation of equipment described in (A). (5)

C. Discuss the single fuel concept. (5)

Q7. With reference to a 4-stroke medium speed auxiliary diesel engine,

a) Describe with a simple sketch bottom end bearing assembly.

b) What is the purpose of serrations provided on the piston rod and bearing keep?

c) What special features are provided on the connecting rod bolts?

Q7.a) Derive an expression for the emf induced in an A.C. generator. (6)

b) A 3000 KVA, 6-pole alternator runs at 1000 r.p.m. in parallel with other machines on 3300V bus-bars. The synchronous reactance is 25%. Calculate the synchronizing power for one mechanical degree of displacement and the corresponding synchronizing torque. (10)

Q7. a) Describe briefly the significance of the factor of subdivision. (6)

b) A ship 120m long has a light displacement of 4000 tonne and LCG in this condition 2.5m aft of midships.  (10)

The following items are then added:

Cargo    10000 tonne      LCG 3.0 m          forward of midships

Fuel      1500 tonne        LCG 2.0 m          aft of midships

Water    400 tonne          LCG 8.0 m          aft of midships

Stores   100 tonne          LCG 10.0m         forward of midships

Using the following hydrostatic data, calculate the final draughts:

Q7. What is understood by risk on board ship? As a 2nd engineer discuss various methods for hazard identification and assessment of risk available on board. (16)

Q7. 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. (6)

B. State the significance of the roughness profile. (5)

C. List the different sophisticated coatings which are available. (5)

Q8. With reference to an electro-hydraulic speed governor fitted to an auxiliary diesel engine driving an alternator,

a) With the aid of a simple sketch, explain the speed droop mechanism.

b) What are the differences between the isochronous and droop governors?

Q8. With reference to electro-hydraulic steering gears:

A. Sketch and describe a steering gear with two 50% torque units conforming to the single failure criteria. (8)

B. State, with reasons, the precautions necessary when operating on two rams only: (4)

C. Describe the tests necessary to ascertain that the gear will operate as required when one side of the circuit develops a malfunction. (4)

Q8. A) Explain how the distribution of masses affects rolling and pitching. (6)

B) A ship turns in a circle of radius 100 metres at a speed of 15 knots. The GM is 2/3 metres and BG is 1 metre. If g = 981 cm/sec2 and 1 knot is equal to 1.8532 Km/hour, find the heel due to turning. (10)

Q8. A. Explain the purpose of interpoles and state their magnetic polarity relative to the main poles of both generators and motors. (6)

B. A 200V, long-shunt compound-wound generator has a full-load output of 20kW. The various resistances are as follows: armature (including brush contact) 0.15 ohm, series field 0.025 ohm, interpole field 0.028 ohm, shunt field (including the field-regulator resistance) 115 ohm. The iron losses at full load are 780W, and the friction and windage losses 590W. Calculate the efficiency at full load. (10)

Q8. Explain why, in spite of accurate alignment under static conditions use of flexible couplings and copious supply of lubricant, main reduction gearing in still subject to pitting, scuffing and other tooth damage; B. Discuss the significance of viscosity in relation to the function of marine turbine oils as used in main propulsion installations, stating how the viscosity is controlled and what could cause it to change in service.

Q9. Explain the working principle of a Variable geometry Turbo charger (VGT) and how it differs from a fixed geometry turbocharger. How is the Variable Geometry Turbocharger (VGTs) important for marine engines and how they help maintain the right mix of air and fuel at different engine power levels.

Q9. a) Explain metal fatigue and how fatigue failure occurs. (4)

b) Differentiate between high stress/low cycle and low stress/high cycle fatigue giving example of each. (4)

c) How do defects in the metal influence the expected life of a component. (4)

d) How does fuel injection timing and cylinder power balance influence the possibility of fatigue cracks developing in the bedplate. (4)

Q9. A. What are the factors which determine the synchronous speed of a motor? (6)

B. 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. (10)

Q9. A. Briefly describe the operation of an electrical or hydraulic main engine governor. (8)

B. For the type described indicate how failure can occur and the action to be taken if immediate correction cannot be achieved and the engine must be operated. (8)

Q9. A) Describe the effect of cavitations on the propeller blades. (6)

B) A propeller 4.6m diameter has a pitch of 4.3m and boss diameter of 0.75 m. The real slip is 28% at 95 rev/min. Calculate the speed of advance, thrust and thrust power.  (10)

Q10. (A) Compare the effectiveness of a current limiting circuit breaker with that of a HRC fuse. (6)

(B) Evaluate for a frequency of 15 kHz, the amplification and the phase difference between input and output signals of a voltage amplifier using a triode having an amplification factor of 48 and a mutual conductance of 1.2 mA/V with an anode-load resistant of 160 k𝛀. The output p.d. is fed by a coupling capacitor of negligible reactance to a subsequent circuit of resistance 480 k𝛀 and the total shunt capacitance is 90 µF. (10)

Q10. A) Describe the stability requirements of a ship for dry-docking. (6)

B) A ship 130m long displaces 14000 tonne when floating at draughts of 7.5m forward and 8.10m aft. GML – 125m, TPC – 18, LCF-3m aft of midships. Calculate the final draughts when a mass of 180 tonne lying 40m aft of midships is removed from the ship. (10)