Q1. a) Sketch a fixed Carbon Dioxide (CO2) fire fighting system, label its main components. (8)
b) Describe the sequence of operations for discharging and the alarm has been raised. (8)
c) What is the purpose of the time delay mechanism in a fixed CO2 system and how does it contribute to crew safety? (4)
Q1. a) Explain the term single phasing as applied to poly phase induction motors. (4)
b) State the likely causes of single phasing and the consequences if motors are not adequately protected. (6)
c) Describe with the aid of sketches THREE methods for motor protection should single phasing occur. (6)
Q1. a) What is the purpose of providing air pipes to tanks in the vessel? (5)
b) Sketch an arrangement of air vent head situated on the weather deck. (6)
c) What factors are considered in deciding the bore size of air pipe? (5)
Q1.a) Sketch a main engine jacket water cooling system. (8)
b) State Why chemical treatment of such system is necessary. (4)
c) What tests are carried out to ascertain the level of the concentration of the chemicals in the jacket cooling water system. (4)
Q1.a) What are the different types of coupling bolts used in practice? Name at least 3. (3)
b) Explain with the help of sketch, as to how a ‘pilgrim’ hydraulic bolt is fitted and removed? (8)
c) How are fitted boards installed on the coupling? (5)
Q2. a) State the areas where an emergency fire pump is commonly installed on a ship and explain the reasoning behind these locations. (6)
b) What fuel arrangements are required for a diesel-driven emergency fire pump to ensure its independent operation? (4)
c) What specific checks should be performed on the emergency fire pump during weekly drills? (6)
d) Explain the precautions to be taken to protect the emergency fire pump system from freezing in sub-zero temperatures. (4)
Q2. With reference to a three-phase shipboard electrical distribution system:
(a) Enumerate the advantages of an insulated neutral system (4)
(b) Enumerate the disadvantages of an insulated neutral system (4)
(c) State why an Earthed neutral system may be earthed through a resistor (4)
(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 (4)
Q1. (a) What is a right-handed and a left-handed propeller? (5)
(b) With the aid of simple sketches explain Rake, Skew and Pitch of the propeller. (6)
(c) What are the advantages and disadvantages of CPP? (5)
Q2. (a) Describe with suitable sketches, how lubricating oil is conveyed to top end, bottom end and main bearings in a large bore slow speed engine. (10)
(b) List the causes leading to sudden loss of lubricating oil pressure in the engine. (6)
Q2. i) Sketch and describe the modern purification system using ‘ALCAP’ concept for purifying fuel specific gravity about 0.991. (8)
ii) Explain how ‘ALCAP’ separator operates as clarifier & how is the water drained off? (4)
iii) What is ‘paring disc’? How does it function? (4)
Q3. a) Outline the potential causes of a crankcase explosion in a ship’s machinery space. (8)
b) Describe the function of crankcase relief doors. (4)
c) Explain the purpose of oil mist detectors in preventing these events on a ship. (8)
Q3. (a) Describe the principle of operation of EACH of the following detecting elements: (8)
(i) Bi-metal strips
(ii) Thermistors
(b) Explain, with the aid of sketches, typical applications where the devices described in (a) may be employed in high voltage electrical systems. (8)
Q3. a) What are the various types of tankers for carrying bulk liquids? (6)
b) Sketch a mid-ship section of a double-hulled crude oil tanker. (10)
Q3.a) What is the function of charge air cooler on 2-stroke Diesel Engine? (4)
b) Draw Diagrammatic sketch of charge air cooler. Describe each part. (8)
c) How the efficiency of charge air cooler can be checked? (4)
Q3. Clean and dry control air is essential for efficient trouble-free operation of a ship’s pneumatic’ control air system.
a) Sketch and describe a low-pressure control air system used on board ships showing various arrangements to deal with dust oil and moisture as well as safety system. (8)
b) Explain using a line diagram, arrangements provided, to reduce the air pressure to 7/8 bars. Required for control air system. (8)
Q4. a) illustrate with a diagram, how the engine room’s hyper mist or high-pressure fog firefighting system works. Describe the sequence of events that occurs during automatic activation of a Hyper Mist system. (12)
b) List the machinery spaces and equipment on a ship where a Hyper Mist system is typically installed. (4)
c) Explain the manual activation procedure for Hyper Mist system, both from the local control point and the main control panel. (4)
Q4. (a) Describe a pressure relief device fitted on a diesel engine crankcase. Are these devices fitted on all sizes of the engine? (8)
(b) What attention do crankcase pressure relief devices require? (4)
(c) Name the factors which must be present for an explosion to occur in the crankcase of a diesel engine. (4)
Q4. (a) Sketch the following types of electric motor connections: (8)
(i) A star connection
(ii) A delta connection
(b) Explain how and why star and delta connections are combined to produce a Star / Delta starter for an electric motor. (8)
Q5. What are the various Annexes to the MARPOL 73/78 convention. Briefly state, what each one of the Annex signifies and the key regulations within each. (20)
Q5. (a) State the necessary conditions required prior to the synchronizing of electrical alternators. (6)
(b) Describe the type of cumulative damage that may be caused when alternators are incorrectly Synchronized. (6)
(c) Explain how the damage referred to in (b) can be avoided/reduced. (4)
Q5. a) In modern electronic type 2 stroke main engines which components are replaced by electronic equivalents. (8)
b) Describe by drawing a simple sketch, fuel injection system on electronic type engine. (6)
c) How fuel is injected at right moment in electronic type engine? (2)
Q6. Explain the following terms and give examples of where each condition might occur
a) Stress Corrosion cracking (6)
b) Creep cracking (5)
c) Corrosion fatigue (5)
Q6. (a) Sketch and describe the significance of chocks? Give the three different types of chocks fitted in marine diesel engines. Briefly describe the purpose of each. (8)
(b) What are the different classification of chocks based on its material? (4)
(c) What are resilient chocks? Where are these fitted and why? (4)
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)
Q6. (a) Explain the principle of conservation of charge and its relationship to Kirchoff's current law. (6)
(b) The open-circuit voltage of a cell as measured by a voltmeter of 100 ohm resistance, was 1.5 V, and the p.d. when supplying current to a 10 ohm resistance was 1.25 V, measured by the same voltmeter. Determine the e.m.f. and internal resistance of the cell. (10)
Q6. a) What are the safety devices fitted to an Air Compressor? (4)
b) What is the purpose of the Scum Valve on a Boiler? (4)
c) What is the function of an Evaporator in a Refrigeration System? (4)
d) Regarding the Emergency Bilge Injection Valve, what is its relevant size compared to the Main Sea Water Injection Valve? (4)
Q7. a) What are the components of a typical Self Contained Breathing Apparatus (SCBA)? (4)
b) State the requirements that govern the SCBA sets and its ready availability during an emergency. (10)
c) Describe the pre-donning checks for a shipboard SCBA unit before entering a confined or smoke-filled Space. (6)
Q7) (a) Sketch a four-ram steering gear arrangement capable of 100% redundancy. (8)
(b) Describe the operation of the arrangement sketched in (a). (8)
Q7. The loads of a 4-wire, 3-phase systems are:
Red line to neutral current = 50 A, power factor of 0.707 (lagging)
Yellow line to neutral current = 40 A, power factor of 0.866 (lagging)
Blue line to neutral current = 40 A, power factor 0.707 (leading).
Determine the value of the current in the neutral wire. (16)
Q7. a) Draw diagrammatic sketch, describing each part of thrust block. (8)
b) Describe how propeller thrust is transmitted to hull? (4)
c) how to measure thrust clearance’s on the block? (4)
Q8. Write short notes on any four of the following: (4 × 5)
a) Making on a lifeboat
b) Voyage data recorder
c) Embarkation ladder
d) Daylight signaling lamp
e) Emergency escape
Q8. (a) Describe the effect of running an induction motor on reduced voltage.
(b) A motor takes a current of 60 amperes at 230 volts, the power input being 12 kW. Calculate the power component and the reactive component of the input current. (10)
Q8. a) Draw Lubricating oil piping diagram will all fittings for a trunk type 4- stroke Diesel Engine. (8)
b) What properties are required for a Lubricating oil used in a 4-stroke Diesel Engine? (4)
c) What is the effect on lubricating oil due to various contaminants during operation of engine? (4)
Q9.a) Explain why air receivers should be drained frequently and its internal surfaces to be provided with protective coatings (6)
b) Describe the procedure for internal inspection of air receivers and the possible defects that may be encountered. Suggest suitable repair methods for the defects. (6)
c) Describe fault conditions associated with air receiver mountings and the remedies to rectify the same. (4)
Q9. With reference to engine inlet and exhaust valves:
(a) State why tappet clearance is essential and why it must be periodically checked. (6)
(b) List with reasons the likely consequences of excessive and insufficient tappet clearance. (4)
(c) State how carbon build-up can occur during engine running and indicate the possible effects on cylinder performance. (6)
Q9. (a) Describe the basic principles of self-excited generators (6)
(b) The armature resistance of a 200 V-shunt motor is 0.4 Ohms and the no-load armature current is 2A. When fully loaded and taking an armature current of 50 A, the speed is 1200 rev/min. Find the no-load speed and state the assumption made in the calculation. (10)
- - - Previously Asked - - -
Q6. (a) Describe the basic principles of self-excited generators (6)
(b) The armature resistance of a 200 V-shunt motor is 0.4 Ohms. The no load (this is the term used when the motor is running light, i.e. not loaded) armature current is 2A. When loaded and taking an armature current of 50A, the motor speed is 1200 rev/min. Find the approximate no load speed (10)
Q5. i) Define ‘centrifugal pump’ and where it is used on ships? Using a simple line diagram show a circuit which include a centrifugal pump. Explain the meaning of ‘suction lift’. (6)
ii) Sketch and describe the construction of a centrifugal pump, labelling its parts. What is a ‘lantern ring’ and why is it fitted? (10)
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