DieselShip's Online Content Library

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. 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.

Q8. Explain in detail how you would isolate one of sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service.

Q7. With reference to the 4-stroke medium speed engines:

A. Define the cause and effect of thermal stressing in cylinder Heads, liners and pistons.

B. Explain why thermal stressing are aggravated with increase in cylinder bore.

C. Explain how stress concentration and its effects are relieved by maintenance and operational practices.

Q8. A. Explain the action of EACH of the following metallurgical mechanism:

(i) Creep;          (ii) Brinelling;   (iii) Fretting;     (iv) Fretting corrosion;

B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.

Q1. With respect to the High Voltage power systems installation, explain the different types of circuit breaker that are used, comparing them on merits and de-merits. Describe the theory of arc phenomenon and the mechanism fitted to mitigate the arc.

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?

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.

Q2. With reference to reciprocating air compressors explain the cause of the following faults.

A. Collapse of discharge valve springs;

B. Breakage of plate valves;

C. Overheating of the discharge air with an unrestricted air intake;

D. Inoperative piston rings.

Q2. What is soft starting of an Induction motor? Describe with a circuit using thyristors used for soft starting. Discuss its advantages and dis-advantages.

Q3. With reference to 2-Stroke Slow Speed Engine:

A. Sketch and describe Main Engine Exhaust Valve.

B. List out a procedure for test of Main Engine Exhaust Valve after overhaul.

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?

Q3. Describe the phenomenon of parametric rolling. what are the measures taken to prevent parametric rolling of ships.

Q4. Give a pragmatic approach to dealing with a sea water leakage, which is flooding the engine room and which has the potential of causing a serious impairment to a vessels stability.

Q3. With reference to main engine automatic slowdown and shutdown systems;

A. List TWO parameters for shutdown and slowdown, state reasons for having these parameters for shutdown and slowdown of engines.

B. How are the above chosen parameters tested while engine is in operation?

Q3. Diesel electric propulsion is now being chosen as the power plant for an increasingly wide variety of vessels.

(a) Sketch a simple layout of such an installation.

(b) Explain the advantages of selecting such a plant.

Q5. With reference to mechanical/hydraulic governors explain:

A. Why flyweights are driven at a higher rotational speed than the engine;

B.  How dead band effects are reduced;

C.  How hunting is reduced;

D.  How the output torque is increased.

Q6. Sketch and describe a “fail safe steering gear” suitable for use on a tanker of more than 100,000 T dwt; Explain the sequence of events that take place when an oil leak takes place in one of the hydraulic pipe lines.

Q4. With the help of sketches explain the different types of strakes used in ship construction. What material is generally used for Hull plating and What are the tests carried out on Hull steel plating for certification as per class rules.

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

Q5. With reference to an emergency source of electrical power in cargo ships: -

A. Describe a typical power source.

B. Give a typical list of essential services, which must be supplied simultaneously;

C. Explain how the emergency installation can be periodically tested.

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?

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. Describe the importance of maintaining the quality of lube oil in maintaining the proper health of marine diesel engines highlighting the role of

(a) Automatic back flushing filters.       (b) Lube oil separators

(c) Magnetic filters                               (d) Visual Inspection                (e) Periodic laboratory tests.

Q1. With reference to Ship stability:
a. With the help of a neat sketch explain the relevant features of a G-Z curve.

b. What are the effects of the below mentioned conditions on the G-Z curve:

i. Increased freeboard,         ii. Increased beam, and        iii. Increased GM.

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.

Q5. Describe the procedure to remove a seized fuel injector body from the cylinder head when it could not be removed by conventional means. Also list out preventive measures which could be implemented in the vessel so that such a seizure can be prevented in the future.

Q1. With reference to the provision of a shore electrical supply to a ship:

A. Sketch an arrangement for taking A.C. shore supply and checks to be carried out prior taking shore connection?

B. Describe the method of safely connecting the arrangement sketched in (A) to the shore Supply?

Q2. How explosion occurs in the starting air line of an internal combustion engine and how can the possibility of such an occurrence be reduced? Sketch and describe devices, which may be fitted to reduce the severity of such an explosion. State the attention which air starting valves should be given before stand by.

Q3. With respect to the properties of fuel oil, explain the significance of the following terms.

(a) Calculated Carbon Aromaticity Inbox (CCAI).

(b) Open flash point and Closed flash point.

(c) The importance of Sodium to Vanadium Ratio.

(d) Octane Number.

Q6. During unit overhauling of Main engine, sudden rough weather caused accident in engine room. State what all checks and precaution taken up prior to carry out such operation.

Q6. A. What is Prismatic Co-efficient (C_P). Derive the formula C_P = C_b/C_m , where  C_b= Co-efficient of fineness and C_m = midship section area co-efficient.

B. The length of a ship is 18 times the draught. while the breadth is 2.1 times the draught. At the load water plane, the water plane area co-efficient is 0.83 and the difference between the TPC in sea water and the TPC in fresh water is 0.7. Determine the length of the ship and the TPC in fresh water.

Q7. A. Describe how protection against short circuit is provided in a 3 phase induction motor circuit.

B. Explain how rotating magnetic field is produced in three phase winding with three phase supply. A 4-pole, 3-phase induction motor operates from a supply whose frequency is 50 Hz. Calculate

(i) Speed at which the magnetic field of the stator is rotating,

(ii) speed of the rotor when the slip is 0.04,

(iii) the frequency of the rotor current when the slip is 0.03.

Q4. Describe the procedure for overhauling Main Air compressor Valves (Plate type) and explain which parts require close attention. using sketches where necessary. Also describe the procedure for testing of these compressor valves.

Q5. Discuss the consequences of failure to maintain correct clearances in the case of main diesel engine crankshaft and bottom end bearings. Sketch a bottom end bearing paying particular attention to the arrangement of ensuring uninterrupted flow of oil to the top end bearing.

Q5. With reference to Boiler water tests carried out onboard:

A. Discuss the possible reasons for the following changes in boiler water test results, and state what actions should be taken in each case;

1. Reduction in total dissolved solids and chemical reserves.

2. Reduction in phosphate reserve, with increase in chlorides and total dissolved solids;

3. Reduction in alkalinity reserve only.

4. Increase in oxygen levels only.

B. State why the complete results of boiler water tests are logged or entered into a data retrieval system rather than a note being made of any particular result which may be outside set limits.

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.

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. With reference to Auxiliary boiler safety valves;

A. Describe with the aid of Sketch the safety valve for an auxiliary boiler;

B. Identify with reasons. The parts that require particularly close attention during overhaul;

C. Describe how the safety valves are reset after an overhaul.

Q8. A. Sketch an arrangement showing the principal of proportional plus integral (P+I) control loop.

B. Compare the series and parallel resonance circuits. Find the frequency at which the following circuit resonates.

Q4. State how EACH of the following defects becomes apparent, describe its effect on engine operation or safety and indicate the corrective action required to restore normal engine condition;

A. Leaking air inlet and exhaust valves;            B. Leaking air start valve;

C. Cracked cylinder liner;                              D. Broken piston rings

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.

Q6. Explain the following terms/statements: -

A. Categories of Noxious liquid substance;

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

C. Double hull tanker;

Q8. With the aid of sketches:
a. Explain various lines plan.
b. The half -breadths of waterplane of a ship of 120m length ad 15m breadth are given below:

Calculate i) Water plane area ii) TPC in salt water iii) Cw iv) LCF from Mid-ship

Q6. Enumerate the maintenance routines carried out for the proper functioning of the following systems:

A. Water hyper mist system   B. Smoke detection system

C. Quick closing valves                          D. Fire hydrants and hoses.

Q9. A. Explain the potential hazards if liquid-cooled transformers are used.

B. What are the losses in transformers? Mention the various factors which affect these losses. In a 25 KVA, 3300/233 V, single phase transformer, the iron and full-load Cu. Losses are respectively 350 and 400 watts. Calculate the efficiency at half-full load, 0.8 power factor

Q4. While operating at Sea during rough weather conditions, fire sparks have been observed coming out from the chimney. On investigation, it has been observed that the fuel contains considerable quantity of water and sludge. As the Second engineer of the vessel. Explain:
A. Immediate actions taken to rectify the problem.
B. Precautions you take to avoid recurrence of this type of problem.

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)

Q6. With reference to a bank of emergency lead acid batteries:

A.  State the conditions of the battery bank if the specific gravity of a number of cells in the bank is in the region of 1.11 with an ambient temperature of 160Celcius;

B. Describe a systematic procedure for checking the conditions of the battery bank if it is divided into section for charging;

C. Describe the necessary routine maintenance;

D. Describe how capacity test carried out on bank of Batteries.

Q10. A. List the precautions necessary before an inclining experiment is carried out.

B. A box shaped vessel, 50 metres long × 10 metres wide, floats in salt water on an even keel at a draft of 4 metres. A centre line longitudinal watertight bulkhead extends from end to end and for the full depth of the vessel. A compartment amidships on the starboard side is 15 metres long and contains cargo with permeability 30%. Calculate the list if this compartment is bilged. KG = 3 metres.

Q9. Explain What is meant by, and the significance of, four of the following terms.

I. Voltage Stabilization,

II. Filter choke;

III. Impedance,

IV. Rectification,

V. Grid bias voltage.

Q9. 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.

Q6. With Respect to main engine turbocharger;

A. Explain why cleanliness throughout the turbochargers system is critical to engine performance?

B. Describe in-service cleaning procedure for gas and air sides of a turbocharger indicating safety precautions to be observed?

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

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.

Q9. A. Explain the effect of making incorrect phase and starter connections.

B. A 440V shunt motor tenets an armature current of 30A at 700 rev/min. The armature resistance is 0.7ohm. If the flux is suddenly reduced by 20 per cent, to what value will the armature current rise momentarily? Assuming unchanged resisting torque to motion, what will be the new steady values of speed and armature current? Sketch graphs showing armature current and speed as functions of time during the transition from initial to final, steady-state conditions.