DieselShip's Online Content Library

Q1. (a) How busbar inspection and maintenance is carried out. (10)

(b) What are safety precautions taken while doing maintenance on the busbar? (6)

Q1. (a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

          (i) Heating arrangement with temperature control. (3)

          (ii) Prevention of air lock in the system. (3)

Q4. Considering that the engine room is the most common single space on board ships for fire to break out, discuss the merits and demerits of the following fixed firefighting systems: (20)

(a) Carbon dioxide

(b) Pressure water spray

(c) High expansion foam

Q1. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to: (16)

(a) The quality of fuel

(b) The quality of servicing of the governor in the last port

(c) The supply of charge air

(d) The overhaul of fuel injectors done in the last decarbonisation.

Give a brief explanation as to why each of the above mentioned points either could be true or cannot at all be the reasons for such a fluctuation.

Q2. Draw and explain the shape of the characteristic curve of a p-n junction diode in forward and reverse bias modes (16)

Q5. (a) Draw a simple line sketch of a 'shell and tube' cooler, clearly labelling its parts. (6)

(b) Describe the system. (4)

(c) Name common defects found. (3)

(d) What periodical maintenance needs to be carried out. (3)

Q4. With reference to a 2- stroke slow speed main propulsion engine air starting system:

(a) State, with reasons, three safety features incorporated in an air starting system. (8)

(b) State with reason why an engine may fail to turnover on air (8)

- - -PREVIOUSLY ASKED - - -

Q4. With reference to a 2- stroke slow speed main propulsion engine, sketch a line diagram showing the air starting system:

(a) State, with reasons, three safety features incorporated in an air starting system. (8)

(b) State with reason why an engine may fail to turnover on air (8)

Q2. What are the main functions of:

(a) Fore peak (4)

(b) After peak (4)

(c) Deep tank (4)

(d) Double bottom (4)

Give examples of liquid carried in these tanks.

Q2. (a) Describe the components forming part of a Gear Pump. Explain how pumping is carried out by gear pump? (8)

(b) By suitable drawing describe what is ‘back lash’ and enumerate its importance. How is 'back lash' measured? (4)

(c) What checks will be carried out during overhauls. (4)

Q2. Describe an emergency electrical power generating plant for use in the event of a complete failure of the main electrical power and make reference to -

a) Location (4)

b) Starting arrangements (4)

c) Fuel oil and its supply (4)

d) Cooling system (4)

e) Periodic attention required (4)

Q3. a) How is the number of Carbon Dioxide (CO2) bottles required for a ship calculated for (i) machinery spaces and (ii) cargo spaces? (12)

b) What means are provided to prevent the inadvertent release of CO2 in the engine room or other protected spaces? (8)

Q3. Discuss the precautions, which can be taken to minimize the possibility of a diesel engine crank case explosion and the transmission of dangerous flame into the machinery space.

(a) By design and equipment (8)

(b) By operating personnel (8)

Q3. With regards to the metacentric height, which of the following statements is true? (16)

(a) It is used to indicate the quality of initial stability.

(b) It is located below the center of buoyancy.

(c) It is measured vertically above the center of buoyancy.

(d) Its determination is the objective of the inclining experiment. Briefly justify your answer.

Q3. (a) How Leaks are detected and rectified on refrigerating plant? (4)

(b) Describe how suction & discharge valves are tested for tightness? (4)

(c) Describe with an illustration, how refrigerant charging is carried out? (8)
- - - Previously Asked- - -

Q7. a) How leaks are detected and rectified on refrigerating plant? (4)

b) Describe how Suction & Discharge valve are tested for tightness? (4)

c) Describe how refrigerant charging is carried out? (8)

Q3. a) Explain the working of a Megger with the aid of its internal circuit. (12)

b) What safety measures are taken while using a Megger? (4)

Q4. During the loading of a petroleum tanker, the incoming cargo forces out from the tank its previous atmospheric contents (air-vapour-inert gas).

Explain:

(a) The dangers of venting during the loading via open tank hatches (10)

(b) Why the pressure/vacuum valves is not used for venting (10)

Q4. (a) What are the causes of Turbocharger surging? How is it indicated to the watchkeeper? (8)

(b) What are the possible remedial action? (4)

(c) What are the reasons for excessive fouling of the turbocharger? (4)

Q4. (a) Describe by drawing a suitable diagram, Bilge water system of an ocean-going ship. Name each part/equipment with its function. (10)

(b) Discuss the commonly associated troubles with the Bilge system and their probable solutions. (6)

Q2. a) What is the purpose of Preferential Tripping system on ship's electrical network? (6)

b) Explain the various stages of preferential trips with the loads connected to those stages. (10)

Q5. (a) Name the safety devices fitted on 2 Stage air compressors on ships. Explain their functional purpose as well as location of fitment, using a schematic diagram. (12)

(b) State the maintenance and checks carried out periodically in order to keep them efficient. (4)

Q5. (a) Describe the changes which take place within a lead-acid battery during discharge and when charging is taking place (10)

(b) What are the safety features you would find in (10)

(i) Paint store

(ii) Battery room

Q3. With reference to the diesel prime movers for generators in unmanned machinery spaces:

(a) Outline the monitoring and control equipment designed to protect the engine. (8)

(b) Describe the methods employed to test the monitoring and control equipment, during a routine check. (8)

Q5. (a) Describe the uses of packed gland seal. What are the machineries they are in use? In a running pump, how the gland packing is lubricated and kept cool? (6)

(b) Describe advantages of using gland packing. (5)

(c) Describe disadvantages of using gland packing. (5)

Q6. a) The current transformer (CT) and potential transformer (PT) or voltage transformer are both measuring devices. List their shipboard application. (6)

b) Sketch and describe any one type of current transformer. (10)

Q5. Define centre of buoyancy and show with the aid of sketches how a vessel which is stable will return to the upright after being heeled by an external force. (16)

Q2. a) What are the safety devices provided on the steering gear system? (10)

b) What is the significance of the shaft hull earthing device on the shafting? (6)

Q6) (a) Describe the constructional features of plate type freshwater generator and its operational procedures for freshwater generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q6. a) What are the different types of garbages that are generated on board as per Marpol Annex V, and what are the provisions for dealing with them? (10)

b) State the requirements for maintaining Garbage management plan and Garbage Record Book, Name the entries to be made in garbage record book. (10)

Q6. With reference to medium speed trunk piston engines:

(a) Explain the purpose of an anti-polishing ring (5)

(b) Describe how effective piston cooling is provided (5)

(c) Where is the thrust bearing fitted and why? (6)

Q6. With respect to centrifuges.

(a) Explain the reasons which shall cause a purifier to overflow (6)

(b) What are reasons that induces vibration in a purifier" (4)

(c) Explain the process of desludging? Why is the purifier amperage an important parameter for the operator? (6)

Q6. Petroleum vapours are a dangerous substance and when mixed with air can be ignited. With this in mind, briefly describe,

a) An explosimeter or combustion gas indicator which can be used to check the atmosphere of a tank or pump room. (10)

b) Describe the explosimeter and its operation. (10)

Q7. (a) Sketch a section through the bedplate and A frame of a large slow speed engine, identifying parts, method of construction and materials (10)

(b) Explain the function of the tie bolts and how after an alignment problem, these would be tightened (6)

Q9. a) Explain Fleming's Right hand rule. (6)

b) A one-turn armature coil has an axial length of 0.4m and a diameter of 0.2m. It is rotated at a speed 500 rev/min in a field of uniform flux density of 1.2 T. Calculate the magnitude of the e.m.f. induced in the coil. (10)

Q8. (a) There are three auxiliary engines having separate quick closing valves in the fuel supply line. How will you safely test these valves for each of the engines without causing a blackout? Discuss the process with the help of a diagram. (6)

(b) How will you reset the quick closing valves after the test is completed? (4)

(c) Explain the significance of flywheel marking on a four stroke engine. (6)

Q8. (a) Describe the functional components of a reefer plant for the domestic refrigeration system and temperatures to be maintained in different cold rooms. (8)

(b) In reference to a domestic refrigeration system briefly describe the following: (8)

(i) Pressure switches

(ii) Tubular heat exchangers

(iii) Oil Separator

(iv) Drier system

Q8. (a) The Centrifugal ballast pump in the engine room also doubles as a fire pump in your ship. What specific precautions would you take to change over the ballast pump from ballast / de-ballast mode to a fire pump mode (10)

(b) How is the emergency bilge suction tested? (10)

Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)

(ii) Explain the operation of this valve (4)

(b) State the materials used for the seat and valve described in (a) (4)

Q8. a) Describe in detail the method used to measure the capacitance of a capacitor.(6)

b) A circuit has a resistance of 3R and an inductance of 0.01 H. The voltage across its ends is 60V and the frequency is 50Hz. Calculate (a) the impedance. (b) the power factor (c) the power absorbed.(10)

Q8. The 1/2 ordinates of a waterplane 120 m long are as follows: (16)

Section AP 1/2 | 1 | 1½ | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 8½ | 9 | 9½ | FP

½ ord 1.2 | 3.5 | 5.3 | 6.8 | 8.0 | 8.3 | 8.5 | 8.5 | 8.5 | 8.4 | 8.2 | 7.9 | 6.2 |3.5 |0m

Calculate: (16)

(a) Waterplane area

(b) Distance of centroid from midships.

Q9. Discuss the causes, possible associated hazards and lowering of thermal efficiency consequent on poor combustion in a Diesel engine cylinder. Illustrate your answer by means of indicator cards (16)

Q6. (a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)

(b) Describe the detailed procedure for an Accumulation of pressure test. (10)

Q7. a) What is the difference between a DC Generator and a DC motor? (6)

b) A 4-pole, 32 conductor, Lap-wound DC shunt generator with terminal voltage of 200 V delivering 12 A to the load has ra = 2 and field circuit resistance of 200 Ω. It is driven at 1000 RPM .

a) Calculate the flux per pole in the machine. (6)

b) If the machine has to be run as a motor with the same terminal voltage and drawing 5 A from mains, maintaining the same magnetic field, find the speed of the machine. (10)

Q9. A ballast tank is 15 m long, 12 m wide and 1.4 m deep and is filled with fresh water. Calculate the load on the top and short side, if: (16)

(a) The tank is just completely full

(b) There is a head of 7m of water above the tank top.