DieselShip's Online Content Library

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) Explain how wear on bearing surfaces is effected by each of the following factors:

(i) Dissimilarity of materials in the contact surfaces

(ii) Relative speed of sliding between the surfaces

(iii) Roughness of the surfaces

(iv) incompatibility of lubricant and bearing material.

(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages. (16)

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.

Q1. With reference to reciprocating air compressors explain the cause of the following faults. (16)

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. With reference to the burning of heavy residual fuel in the main engine:

a) State with reasons FOUR modifications which need to be made as compared with the same engine burning distillate fuels. (8)

b) State with reasons SIX properties you would require seeing in the specification for residual fuel indicating the effect EACH of these properties might have with respect to the storage and burning of the fuel. (8)

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)

Q7. Name various statutory Certificates and Documents to be carried on board Crude Oil Tankers giving a reference to the conventions and justify for their requirement. (20)

Q2. What is Metal-locking? What types of repairs are carried out by metal-locking? Describe the repair procedure using Metal-Locking.

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 iron.

Q3. (a) Explain why variable exhaust valve closing can be advantageous in the operation of large slow speed main engines. (6)

(b) Explain, with the aid of a sketch, how variable exhaust valve closing is achieved. (6)

(c) Explain how high impact is avoided as the valve closes. (4)

Q3. a) Explain why pilot injection is required for a Dual fuel engine when burning natural gas.

b) Describe, with the aid of a sketch, the arrangements for a dual fuel engine which is capable of burning natural gas on

a) The Otto cycle.

b) The Diesel cycle. (16)

Q1. 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;

B. State the significance of the roughness profile.

C. List the different sophisticated costing which are available.

Q6. a) With the aid of a simple sketch, explain the “trouble spots” in a basic air-conditioning unit.

b) With reference to your sketch, explain the following: -

(i) How the problem of increase in humidity of cooled air is overcome?

(ii) How discomfort caused by the excessive drying effect of heated air is overcome?

Q3. With reference to Underwater Inspection in lieu of Dry docking (UWILD)

A. Explain in detail, how an underwater survey is carried out. (6)

B. State the requirements to be fulfilled before an underwater survey is acceptable to the survey authority. (5)

C. Construct a list of the items in order of importance that the underwater survey authority should include. (5)

Q4. The LT cooler of the centralized cooling water system on your ship is showing poor performance. What measures you would initiate to rectify the problem and improve the performance. (16)

Q4. a) Enumerate the causes of vibration in diesel machinery and shafting. (5)

b) Describe procedures by which it may be reduced by operating personnel, suitable design and devices. (6)

c) State the possible effects of vibration on machinery and crewmembers. (5)

Q4. Reverse osmosis is the modern alternative for shipboard production of drinking water.

(a) Describe using simple diagrams if necessary, the principle of reverse osmosis. (8)

(b) Sketch a line diagram showing a single pass system for producing fresh water from sea water and describe the system. (8)

Q5. a) Describe how propeller shaft/stern bearing clearance is measured. (4)

b) Identify with reasons the major factors which substantially determine the range of permissible clearance. (4)

c) State with reasons what parts of propeller shafts should receive particularly close inspection upon withdrawal of such shafts for survey. (4)

d) State why some propeller shafts require less frequent inspection than others. (4)

Q5. Regarding the carriage of crude oil and its associated products:

a) (i) State the dangers involved.

(ii) State what publications give guidance on safety.

b) Sketch and describe the operation of an explosimeter suitable for testing pump rooms or tanks.

c) Define the terms lower and upper flammable limits Illustrating your answer by means rough sketch of a hydrocarbon vapour oxygen graph.

Q1. Explain why auxiliary engine bottom-end bolts are prone to failure, even under normal running conditions. Identify those features, incorporated into the design of bottom-end bolts, to inhibit failure. Explain how this tendency is either aggravated or inhibited during maintenance and what checks are to be carried out. (16)

Q5. With reference to Gear pumps used for lubricating oil transfer.

(a) Sketch and describe a gear type pump indicating the flow of fluid. (6)

(b) State the materials that gear type pump components may be manufactured from. (4)

(c) Specify THREE applications that are suitable for the employment of gear type pumps. (6)

Q6. With reference to Air-conditioning System onboard your vessel:

a) Sketch and describe a high-pressure cut-out in a refrigeration system. (6)

b) The refrigeration compressor has stopped due to operation of the H.P. cut-out. (4)

Explain: (i) The possible causes.

ii) How these causes would be found and possible remedies.

c) What steps are taken if the compressor “Short-cycle” on low pressure cut-out? (6)

Q6. Explain why the bilging of empty double-bottom or deep tanks below the waterline leads to an increase in GM. B. A ship of 10,000 tonnes displacement has GM=0.5 metres. The period of roll in still water is 20 seconds. Find the new period of roll if a mass of 50 tonnes is discharged from a position 14 metres above the centre of gravity.

Q6. A. State the various documents pertaining to a ship that a port state control inspector would ask for during port state control inspection.

B. If your vessel-gets detained by the PSC owing to a deficiency, what would be your action for redressal. (20)

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.

Q6. Sketch and show all parts of a two-stroke engine stuffing box. Describe the procedure of overhauling two stroke engine stuffing box, without removing piston. All safety precautions and proper tools used for overhaul to be mentioned. (16)

Q7.a) What is the purpose of the main thrust bearing? (4)

b) When checking the main thrust bearing, what dimensional checks would be necessary? (4)

c) How is a thrust bearing cooled? (4)

d) Describe, with a sketch, the special chocking arrangements normal to thrust bearing. (4)

Q1. 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. (20)

Q7.  With reference to the exhaust gas boiler of your ship explain the following: (16)

a) Composition and reasons of soot deposits.

b) Various stages of soot fire leading to high temperature fire.

c) Procedure to be followed for firefighting under different stages of soot fire.

d) Actions required prior to dry running of an exhaust gas boiler.

Q7. With regards to process control system explain following: (16)

A. Proportional control.

B. Integral control.

C. Derivative control.

D. The necessity of derivative control.

Q8. With reference to an engine air starting system

(a) Explain why a slow turning is fitted. (4)

(b) State, with reasons, when a slow turning system operates. (6)

(c) Describe, with the aid of a sketch, an air starting system, explaining how the slow turning system operates. (6)

Q2. Explain the advantages and disadvantages of an inert gas smothering system from flue gasses compared to an inert gas generator. Explain why inert gas generator is more advantageous. Why it is unsuitable for use in machinery spaces. (20)

Q8. If soon after joining a motor ship, you found a number of holding down bolts slack and fretting to have occurred in the area of slack bolts. Describe how you would handle the situation? (16)
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Q8. If soon after joining a motor ship, you found a number of holding down bolts slack and fretting occurred at slacked bolts. Describe how you as a second engineer deal such situation? (16)

Q6. With regards to main transmission shaft flange coupling arrangements:

A. Sketch a hollow type coupling bolt and the hydraulic head/nut and loading rod which are used to fit it.

B. Describe how the bolt is fitted.

C. State the advantage of the hollow coupling bolt as compared to the traditional type of coupling bolt.

Q3. a) What is the Carbon Intensity Indicator (CII) and how is it calculated under IMO regulations? Explain its significance in reducing the carbon footprint of ships. (10)

b) What role does the Second Engineer play in ensuring compliance with CII requirements on a ship? Discuss the operational strategies and maintenance practices that the Second Engineer can implement to improve a ship's CII rating. (10)

Q9. With reference to electrohydraulic steering gear systems with four rams. (16)

(a) With the aid of a sketch describe the working principle of hydraulic pump.

(b) Explain the method adopted to prevent hydraulic oil leakage along the rams.

(c) Discuss the methods adopted to prevent damage to the steering gear due to jumping of rudder in heavy seas.

Q9. A) Explain why the rudder angle does not normally exceed 35°. (6)

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: Fn=577 Av2 sin  N. Allow 20% for the race effect. (10)

Q9. a. Explain why top bracing is used for large crosshead engines. (4)

b. Describe, with the aid of a sketch, a hydraulic top bracing unit for a large crosshead engine indicating where the top bracing is fitted and how it operates. (6)

c. Write instructions for the checking of a large crosshead engine top bracing system and a holding down system. (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.