DieselShip's Online Content Library

Q1. A. Sketch and describe a total flooding CO2 gas system suitable for the protection of machinery spaces; B. State, with reasons, which valve should be operated first in the system shown in (A).

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.

Q5. With reference to a three-phase shipboard electrical distribution system: A. Enumerate the advantages of an insulated neutral system; B. Enumerate the disadvantages of an insulated neutral system; C. Describe how the earthed neutral system is Earthed; D. Compare the use of an insulated neutral system as opposed to the use of an Earthed Neutral System with regard to the risk of electric shock from either system.

Q4. Accidents regularly occur due to premature or accidental release of CO2 into machinery spaces. With reference to this, enumerate the procedure or arrangement that you as second engineer would adopt with respect of the following

A.  Contractors working on CO2 system;

B. Understanding between bridge and engine room in the event of a machinery space fire;

C. Familiarizing staff with the system;

D. Checks and tests are carried out before putting system in operation?

Q8. A. Discuss the principal forces a large diesel engine crankshaft must withstand while in service and how the stresses resulting from these forces are kept within acceptable limits by good design and operation criteria; B. Discuss the manner in which the crankshaft may be overstressed and the consequences arising there from.

Q1. With regard to care of lubricating oils onboard, answer the following:

(a)  Microbial degradation of lubricating oil and measures to prevent the same

(b)  Methods of ensuring correct sampling is done for the purpose of shore based testing.

(c)  If the shore based testing results show an abnormal values of water content and TBN for the crank case lub oil of a slow speed main engine, what will be interpretation and subsequent action?

Q2. In the event of a failure of the main electrical power supply on a ship, an emergency source of power must be available.  State the circuits which must be fed from such a source and discuss the reasons governing the selection of such circuits.

Q8. A. Define longitudinal centre of gravity (LCG) and longitudinal centre of buoyancy (LCB).

B. A ship 120m long floats has draughts of 5.50m forward and 5.80m aft; MCT1 cm 80 tonne m, TPC 13, LCF 2.5m forward of midships. Calculate the new draughts when a mass of 110 tonne is added 24m aft of midships.

Q2. A. i.  Describe the characteristics of a d.c. motor. ii Explain the advantages of such a motor for deck machinery; B. Describe with the aid of a sketch a control system for the motor in (A).

Q6. Under Continuous survey of machinery (CSM) bottom end bearing of a large 2stroke slow speed engine is due for survey.

A. As second engineer, explain the procedure involved in complete inspection of a bottom end bearing.

B. List the precaution to be taken.

C. Indicate the reasons for possible defects which could be encountered and state how they may be rectified.

D. What test are carried out on completion of survey and re-assembly.

Q4. Sketch and describe a common rail fuel system as fitted to a diesel engine. How is delivery of the fuel controlled?

Q7. Compare the destructive testing done on engineering materials with non-destructive testing done on engineering components. Briefly describe one destructive test and two non-destructive tests to illustrate your answer

Q8. A. Explain the use of KN curves. B. A ship of 12000 tonne displacement has a rudder 15m2 in area, whose centre is 5m below the waterline.  The metacentric height of the ship is 0.3m and the centre of buoyancy is 3.3m below the waterline.  When travelling at 20 knots the rudder is turned through 30 .  Find the initial angle of heel if the force Fn perpendicular to the plane of the rudder is given by: Fa=577 Av2 sin  N, Allow 20% for the race effect.

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.

Q4. List at least two factors that cause deterioration of the frequency response of a transistor amplifier. Explain how each factor affects the performance of the amplifier and the portion of the frequency range where it is effective.

Q6. A. State the circumstances owing to which it may be necessary to renew a cylinder liner.

B. Explain how the liner is removed

C. Explain how the new liner is fitted; State the important checks to be made before and after fitting.

Q3. A. Draw an “out of phase” diagram for a large 2-stroke slow speed cycle engine. Describe in detail the part of the cycle showing the diagram. Using the diagram explain the effects of burning liable and low grade fuels (when fuel injection timing is not altered). Explain how good ignition and combustion can be obtained when using low grade fuel.

Q3. What do you understand by ‘safematic steering gear’ and how does it work?

Q6. A. Describe a vacuum sewage system;

B. With reference to the system described in (A) - i. State ONE advantage of the system;

ii. State why a holding tank may be required to be fitted to the system;

iii. State the problems resulting from the retention of untreated sewage in a holding tank.

Q1. Describe the relationship between frictional resistance and

(a) Ship’s speed;

(b) the wetted area;

(c) surface roughness;

(d) The length of the vessel.

Q8.  Describe the procedure to be undertaken when, upon a routine schedule for changing fuel injector on a main engine, it is found that the injector body is seized and cannot be removed by conventional means

Q1. Differentiate with the aid of simple sketches between the following types of electronic circuits;

A. Rectifier circuit;

B. Amplifier circuit;

C. Oscillator circuit.

Q6. A. Sketch and describe a flywheel that would be fitted to a large marine diesel engine; B. Show in the sketches how it is fitted and secured; C. What is the purpose of the flywheel? Recently some engine makers have considerably reduced the size of the flywheel. Explain how this can be done.

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.

Q6. A. Describe how water tightness is maintained where bulkheads are pierced by longitudinal beams or pipes.

B. A triangular bulkhead is 7 m wide at the top and has a vertical depth of 8 m.  Calculate the load on the bulkhead and the position of centre of pressure if the bulkhead is flooded with sea water on only side:

(i) to the top edge,               (ii) with 4 m head to the top edge.

Q9. A) As Second Engineer of a new ship, prepare standing orders for all future bunkering operations;

B.  State why it is very important to obtain a representative sample of heavy fuel bunkers taken and explain how a representative sample is obtained

C. What information is provided in bunker Delivery note (BDN).

Q3. A) Describe the circuit breaker for an a.c. generator using a sketch to show how arcing is Controlled.

(B)Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would require following such event;

(C) Give a safe procedure to follow should a main circuit breaker fail to open under fault Condition.

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.

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.

Q6. With respect to tankers describes: - (16)

A. How a pump room is ventilated?

B. How cargo tanks are ventilated?

C. Cargo tank protection as per SOLAS 1974.

D. Additional alarms provided for inert gas systems of the ‘inert gas generator’ type.

Q6. A. Explain the purpose of non-watertight longitudinal subdivision of tanks. B. A ship 90 long displaces 5200 tonne and floats at draughts of 4.95m forward a nd 5.35 m aft when in sea water of 1023 kg/m3. The waterplane 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. With respect to MARPOL 73/78, Annex - II, Noxious liquid chemicals are divided into categories; A. State the number of categories, and what does each category signify. B. State the requirement of Procedures and Arrangements Manual, and what information is available.

Q6. What design factor limits the maximum torque of a d-c motor? Of an a-c motor? A shunt motor runs on no load at 700 r/min off a 440 V supply. The resistance of the shunt circuit is 240?. The following table gives the relationship between the flux and the shunt current: Calculate the additional resistance required in the shunt circuit to raise the no-load speed to 1000 r/min.

Shunt current (A)
0.5
0.75
1.0
1.25
1.5
1.75
2.0
Flux per pole (m Wb)
6.0
8.0
9.4
10.2
10.8
11.2
11.5

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.

Q3. Discuss critically the following alternative types of main propelling machinery for installation in a proposed new ship - A. 2 stroke single acting cross head type slow speed engine; B. 4 stroke single–acting with reverses / reduction gear.

Q7. Describe the possible faults which may be found during a dry-dock inspection of the following; A. Stern frame; B. Sea chest; C. Bilge keel; D. Anodes; E. Rudders.

Q7. For an ISM certification, explain the key clauses, which are required to be complied with obtaining Interim DOC, State the responsibility of a Second Engineer with respect to satisfactory implementation of SMS on board ship.

Q9. (a) Describe how thrust power is determined. (6)

(b) The following information relates to a model propeller of 400mm pitch:

(i) Plot curves of thrust and torque against rev/min

(ii) When the speed of advance of the model is 150 m / min and slip 0.20, calculate the efficiency.

Q7. A. On what factors does the capacitance of a parallel-plate capacitor depend? B. A tuned circuit consisting of a coil having an inductance of 200µ H and a resistance of 20Ω in parallel with a variable capacitor is connected in series with a resistor of 8000Ω across a 60 V supply having a frequency of 1 MHz. calculate A. The value of C to give resonance; B. The dynamic impedance and the Q factor of the tuned circuit; C. The current in each branch

Q9. During normal engine operation, a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise -

A. State with reasons the possible causes.

B. Explain in detail how the engine might be safely operated if the damage caused by this incident is such that the turbocharger cannot function.

C. State with reasons the factors which may limit engine operating speed with the turbocharger out of operation.

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.

Q8. With reference to oil/water separators:

A. Describe with the aid of a sketch, the working of such a separator. (6)

B. Explain the consequence if the interface detector position is incorrect. (5)

C. Enumerate the various possibilities by which oil / water interface can be moved. (6)

Q8. A. Explain why the amplitude of ship motion should be limited B. A ship of 8100 tonne displacement floats upright in seawater. KG = 7.5m and GM = 0.45m A tank, whose centre of gravity is 0.5m above the keel and 4m from the centreline, contains 100 tonne of water ballast neglecting free face effect, calculate the angle of heel when the ballast is pumped out.

Q8. With reference to Port State Control: A. State the various MOU’s and the purpose of having a port state control regime; B. Give at least 3 examples of deficiency which may lead to detention of your vessel; C. If your vessel gets detained by the PSCO owing to a deficiency, what woul be your action for redressal.

Q8. A. What is reactive power? Why is such term not encountered when d-c sources are used in electric circuit? B. A transistor amplifier stage comprises a transistor of parameters hie = 800 Ω and hfe = 50 and hoe = 20µ S, and bias components and coupling capacitors of negligible effect. The input signal consists of an e.m.f of 60mV from a source of internal resistance 2.2k Ω and total load on the stage output is 4k Ω. Determine the current, voltage and power gains of the amplifier stage.

Q9. Severe engine vibration has recently become evident when the main engine for which you are responsible operates within a certain speed range –

A. State, with reasons, the possible causes of such vibration;

B. State the consequences of operating the engine under such vibratory conditions;

C. Describe the procedure you, as Second Engineer, would implement in order to investigate and rectify the problem.

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.

Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.

B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;

C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)

Q9. A. Explain the effect of bilging a centreline compartment located away from amidships. B. A Ship of 5000 tonnes displacement enters a dry dock trimmed 0.45m by the stern. KM=7.5m., KG=6.0m. MCTC=120 tonnes-m.  The centre of flotation is 60m. Frome aft. Find the effective metacentric height at the critical instant before the ship takes the blocks overall, assuming that the transverse metacentre rises 0.075m.

Q9. Write reference to gravity life boat davits; state the purpose of the following:

A. Centrifugal brake, B. Dead man’s handle; C. Davit limit switch.

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.

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.

Q6. With reference to hydraulic system for deck machinery identify: A. The types of contamination likely to be found in hydraulic systems for deck machinery; B. The sources of such impurities; C. Means used to prevent problems with contamination; D. Possible effects of the oil contamination on the system.

Q8. How are large slow speed engines structured to withstand the following forces?

A. Forces due to combustion load;

B. Guide forces;

C. Inertia forces.

Q7. A. Describe stability requirement for dry-docking.

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 centre line, 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.

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.