DieselShip's Online Content Library

Q1. Draw and describe the construction of a forepeak tank. Explain how are the effects of panting and pounding taken care with help of neat sketches?

Q1. With reference to independent emergency fire pumps:

(a) State three areas where they are commonly installed and give reasons why?

(b) (i) Describe with the aid of a sketch an air pump or primer used to initiate suction when the fire pump is situated above sea water level;

(ii)state the suction lift which would be expected from a single stage pump system?

(c) State how the capacity of the fire pump should be tested.

(d) State how it can be ensured that the pump is kept in good working order.

(e) State what precaution must be taken in sub-zero temperatures.

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. Explain the methods used to control the speed of a 3 Phase induction motors. Draw and Explain a Variable Frequency Drive used for optimization of energy efficiency of auxiliary machineries on board vessels.

Q5. Explain the term “cascade control’ and sketch such a system suitable for use with a main engine jacket cooling water system. Show the variation of pressure and temperature at major points of the system.

Q4. Sketch a sealing arrangement for an oil lubricated stern tube.

a) Identify the common forms of seal failure. (6)

b) State how oil loss due to seal failure can be restricted whilst on passage. (5)

c) What is the material used for sealing rings and propeller shaft liner? (5)

Q2. A. Describe the double bottom and framing arrangement used in the machinery space to cope up with the concentrated loads and vibration, together with shaft and thrust block support.

B. Give reasons for the choice of thrust block position.

Q2. With reference to free fall lifeboat of an ocean-going ship:

A. Periodical maintenance, tests and checks on lifeboat and releasing gear.

B. Secondary means of lowering.

C.  Lifeboat Drills.

Q1: A. Outline the procedure for the inspection of the rudder in a dry dock.

B. What are the requirement with respect to steeling gear as per SOLAS 74, as amended for the following:

i. Relief valve;

ii. Steering gear control;

iii. Electrical power circuits.

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.

Q2. A. Outline the problems associated with improper lubrication of the liner and piston assembly of a large slow speed engine.

B. Describe and state the causes of each of Clover leafing and Micro-seizure

C. List out the composition of a cylinder oil suitable for an engine operating on VLSFO.

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.

Q3. With respect to propellers:

(a) With simple sketches explain how to measure the pitch of propeller.

(b) How does cavitations take place? How can this effect be reduced?

(c) Compare the advantages and disadvantages between a built and a solid propeller.

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.

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.

Q3. A. Give a brief outline of the care maintenance that should be given to the stator and rotor of an A.C. generator;

B. Explain what is likely to occur if the driving power of one A.C. generator suddenly fails when two generators are running in parallel. What safety devices are usually provided for such events?

Q6. With reference to bridge control of a large slow speed propulsion engine.

A. How is starting and reversing achieved?

B. Investigate and suggest remedial action required if the engine,

(i) Fails to turn on air.

(ii) Turns on air but fails to fire on fuel;

(iii) Fails to reverse.

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.

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. 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.

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?

Q4. A. Describe a brush less alternator with a.c. exciter static A.V.R.;

B. State the output voltage characteristics for this type of machine.

Q9. Describe the phenomena of vibration in marine diesel engine. Explain the terms:

(a) Transverse Vibration (b) Torsional Vibration (c) Resonance (d) The role of vibration dampers.

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.

Q5. Write short notes on resistance encountered by a sailing ship in water. What structural changes are in place to minimize them

Q5. 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 batteries operate at loss of main power

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

Q2. A). Describe the overhaul of a boiler safety valve and explain using sketches where necessary those parts which require particularly close attention;

B). Describe the setting of boiler safety valve to comply with classification society requirements.

Q5. What is Zener diode and how does it regulate the voltage ? What happens to the series current, load current and Zener current when the d.c. input voltage of a Zener regulator increases? Draw a neat diagram of Zener regulator and explain.

Q6. A. Sketch a Main Engine air starting system and describe how it operates. B. List the safety devices and interlocks incorporated in such a system and state the purpose of each

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.

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.

Q7: An oil tanker 160m long and 22m beam floats at a draught of 9m in seawater. Cw is 0.865. The midships section is in the form of a rectangle with 1.2m radius at the bilges. A midships tank 10.5m long has twin longitudinal bulkheads and contains oil of 1.4 m3/t to a depth of 11.5m. The tank is holed to the sea for the whole of its transverse section.  Find the new draught.

Q6. With respect to the hazardous areas of tankers,

A. Explain the term flameproof (Ex d) for electrical equipment;

B. State the type of electrical equipment that would be protected in this way.

C. List likely defects of flameproof equipment.

Q6. (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 a turbo charger having to be taken out of service.

(d) Indicate the effect this action will have on engine operation

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.

Q3. With reference to turbocharger bearings:

A. Discuss the relative advantages and disadvantages of white metal sleeve and ball race bearings for turbocharger rotor support.

B. State with reasons how axial location of the rotor is achieved.

C. Explain how the bearing are kept cool in service.

D. Indicate how the bearings are sealed from the atmosphere and exhaust gas.

Q6. With Respect to Container Ship: -

A. Sketch a ship’s indirect refrigeration system arranged for cooling containers stowed in stacks in the hold;

B. Describe the refrigeration system sketched in (A);

C. State the advantages of the system described in (A) compared with containers with their own refrigeration self-contained units.

Q9. With respect to Ship Propulsion:

a. Explain the various efficiencies associated with propeller and shafting arrangement.

b. When a propeller of 4.8 m pitch turns at 110 rpm, the apparent slip is found to be —S % and the real slip is 1.5 S %. If the wake speed is 25 % of the ship speed, calculate the ship speed, apparent slip and the real slip.

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.

Q5. 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;

B. With reference to MSC1/Circ.1318/Rev.1, high pressure cylinders (CO2 bottles) are subjected to an internal inspection and hydrostatic test and periodic test. State the stipulated criteria for such hydrostatic test and periodic test interval of high-pressure cylinders (CO2 bottles).

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)

Q5. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension.

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.

Q10. a) Describe the various resistances acting against the motion of the ship?

The following data are available from the hydrostatic curves of a vessel.

Calculate the TPC at a draught of 5.05m.

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.

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.

Q6. A. What are the characteristics of PN junction diode? Point out its specifications. Also point out the significance of dynamic and static resistances.

B. Draw the circuit of Half-wave rectifier and its output waveform. A diode whose internal resistance is 20 is to supply power to 1000 load from 110 V (RMS) source. Calculate

(i) peak load current, (ii) DC load current, (iii) AC load current.

Q8. With reference to main boiler super heater arrangements:

(a) Compare the advantages and disadvantages of contra flow with parallel flow design.

(b) How the element tube bank is supported and yet allow for expansion?

(c) How boiler carryover affects super heater effectiveness?

Q5. You were asked to join a ship as second engineer. During briefing you were informed about frequent boiler uptake fires happening onboard. prepare a plan for to reduce boiler uptake fires. How will you monitor the progress of your plan and what instructions you will issue to the watch keepers?

Q9. (a) Explain the concept of dynamical stability.

(b) A ship of 5000 tonne displacement has three rectangular double bottom tanks A: 12m long and 16m wide; Tank B: 14m long and 15m wide; C 14m long and 16m wide.

calculate the free surface effect for any one tank and state in which order the tanks should be filled when making use of them for stability correction.

Q9. With reference to chemical tankers:

A. Sketch a suitable cargo pumping and stripping system, labelling the component parts and indicating the direction of fluid flow;

B.  State the requirements of the regulations involved to reduce pollution of the sea by chemical tanker cargoes.

Q6. With Reference to Main Engine Fuel Pumps.

(a) Explain how the setting of a variable injection timing fuel pump is checked and adjusted.

(b) State why it may be necessary to adjust the settings of a variable injection timed fuel pump.

Q9. A. Show how the power that is transferred across the air gap of the three-phase induction motor is represented. Explain the terms. What portion of this is useful power?

B. A 440 load of 400 KW at 0.8 (lagging) power factor is jointly supplied by two alternator A and B. The KW load on A is 150 KW and the KVAr load on B is 150 KVAr (lagging). Determine the KW load on B, the KVAr load on A, the power factor of operation on each machine and the current loading of each machine.

Q9. (a) List out the differences in the ME engine, as compared to conventional MC engine?

(b) What is the purpose of the HPS system? What is meant by the HCU-which components are included in this?

(c) Briefly explain ELFI/FIVA valve function.

(d) Describe the differences in the working of the fuel pumps (Called fuel Pressure Boosters) in ME engines, as compared to the fuel pumps of conventional engines.

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.

Q10. (a) Explain what is meant by left and right handed propellers, and also explain the rotation of propellers in a twin-screw ship.

(b) A propeller 6m diameter has a pitch ratio of 0.9, BAR 0.48 and, when turning at 110 rev/min, has a real slip of 25% and wake faction 0.30. If the propeller delivers a thrust of 300 KN and the propeller efficiency is 0.65. Calculate:

i. Blade area;

ii Ship speed;

iii. Thrust power;

iv Shaft power

v. Torque.

Q10. A.  Explain the preference for a 60 Hz system. Describe the dangers of running a 50 Hz system from a 60 Hz supply.

B. A ring-main, 900m long, is supplied at a point A at a p.d. of 220V. At a point B, 240m from A, a load of 45A is drawn from the main, and at a point C, 580m from A, measured in the some direction, a load of 78A is taken from the main. If the resistance of the main (lead and return) is 0.25 ohm per kilometre, calculate the current which will flow in each direction round the main from the supply point A and the potential difference across the main, at the load where it is lowest.