Describe the working principle of the four stroke cycle.
(10)
Study Notes MDE Unit 1 Q1 Quiz 1 MDE Unit 1 Q1 Quiz 2 MDE Unit 1 Q1 Quiz 3 MDE Unit 1 Q1 Quiz 4
(a) With reference to the combustion of fuel, explain EACH of the following terms:
(i) atomisation; (3)
(ii) penetration; (2)
(iii) compression ratio.(1)
(b) State the factors which influence the terms explained in part (a).(4)
Study Notes MDE Unit 1 Q2,3 Quiz Answer
(a) Sketch a cross section through a four stroke diesel engine piston, labelling the MAIN components.(6)
(b) Describe the transfer of gas force from piston crown through to the crankshaft.(4)
Study Notes Quiz Answer
(a) State THREE desirable properties of piston rings. (3)
(b) State the materials commonly used for piston rings.(2)
(c) Sketch THREE different types of piston ring ends.(3)
(d) Explain why piston ring end clearance is necessary.(2)
Study Notes MDE Unit 2 Q1 Quiz
(a) Show, using sketches, the THREE clearances necessary for efficient piston ring functioning.(3)
(b) Explain why piston rings are necessary.(2)
(c) Explain why the clearances sketched in part (a) are necessary.(5)
Study Notes MDE Unit 2 Q2 Quiz
With reference to diesel engines thermal and mechanical efficiency, describe where the losses may occur.
(10)
Study Notes MDE Unit 2 Q3 Quiz
With reference to a diesel engine chain driven camshaft:
(a) state the important checks that must be made during the drive inspection;(6)
(b) explain why the checks described in part (a) are necessary.(4)
Study Notes MDE Unit 3 Q1 Quiz
With reference to engine timing belts or chains:
(a) state the cause of loss of timing drive tension;(2)
(b) state how this will affect the engine;(6)
(c) explain how slight loss of tension can be corrected.(2)
Study Notes MDE Unit 3 Q2 Quiz
Study Notes MDE Unit 3 Q3 Quiz
(a) Sketch a four stroke timing diagram, showing the position of fuel valve, exhaust valve and inlet valve operation.(8)
(b) Explain the meaning of the term valve overlap, stating its purpose.(2)
Study Notes MDE Unit 3 Q4 Quiz
(a) Describe the procedure for setting tappet clearance on diesel engine inlet/exhaust valves.(6)
(b) Explain the importance of tappet clearances.(4)
Study Notes MDE Unit 3 Q5 Quiz
Study Notes MDE Unit 3 Q6 Quiz
(a) Describe the function of a main engine turbocharger.(5)
(b) Describe how the turbocharger is cooled.(2)
(c) Describe how the turbocharger is lubricated.(3)
(a) Explain why air coolers are fitted after main engine turbo chargers.(6)
(b) Explain the effects of undercooling the charge air on the engine. (4)
With reference to large medium speed diesel engine turbo chargers:
(a) explain why a thrust bearing is needed;(4)
(b) state where the thrust bearing is fitted;(2)
(c) describe how the thrust bearing is lubricated.(4)
With reference to main engine turbo chargers, explain the purpose of EACH of the following:
(a) the volute casing;(3)
(b) the diffuser;(4)
(c) the nozzle ring.(3)
With reference to diesel engine turbocharger construction, explain the purpose of EACH of the following:
(a) labyrinth glands;(3)
(b) diffuser;(3)
(c) inducer;(2)
(d) thrust bearing.(2)
With reference to large medium speed diesel engine turbo chargers:
(a) explain what is meant by the term pulse system;(6)
(b) explain the advantage the pulse system has over the constant pressure system.(4)
With reference to a turbocharged engine fitted with charge air cooler, It is noticed that boost pressure at the inlet manifold is reducing over a period of time:
(a) list FOUR possible causes; stating a simple and economical in service maintenance routine that would rectify EACH(8)
(b) state the effect reduced inlet pressure at full load will have on the engine.(2)
(a) Explain why the air outlet from the turbocharger should be cooled before entering the diesel engine cylinder.(4)
(b) Explain why the charge air cooler has fins attached to its tubes.(2)
(c) State possible reasons why the charge air coolers performance may be reduced.(4)
With reference to air coolers, explain the purpose of EACH of the following:
(a) zinc anodes;(3)
(b) vent cocks;(3)
(c) tube fins.(4)
With reference to poor turbocharger performance:
(a) state FOUR possible causes;(4)
(b) describe the possible indications.(6)
(a) Sketch a cross section through a resilient/flexible mounting for a diesel engine, labelling the MAIN components.(8)
(b) State the special consideration necessary with respect to the engine installation when using the type of mounting in part (a).(2)
(a) Describe the operation and purpose of a diesel engine fuel nozzle.(6)
(b) State the defects diesel engine fuel nozzles may encounter during service.(4)
Study Notes MDE Unit 5 Q1 Quiz
(a) Sketch a section through the nozzle of a fuel injector, labelling the MAIN components.(6)
(b) Explain what is meant by EACH of the following terms:
(i) atomisation;(2)
(ii) penetration.(2)
Study Notes MDE Unit 5 Q2 Quiz
With reference to four stroke engines, explain the effects of EACH of the following:
(a) advanced fuel injection;(3)
(b) retarded fuel injection:(4)
(c) low compression pressure.(3)
Study Notes MDE Unit 5 Q3 Quiz
With reference to Bosch or jerk type fuel injection pumps:
(a) describe how the delivered quantity of fuel oil may be controlled;(6)
(b) explain the purpose of the delivery valve.(4)
Study Notes MDE Unit 5 Q4 Quiz
With reference to scroll type fuel injection pumps:
(a) describe how the delivered quantity of fuel may be varied:(5)
(b) explain the purpose of the delivery valve:(3)
(c) describe how fuel oil is prevented from spraying out if the high pressure pipe fails in service.(2)
Study Notes MDE Unit 5 Q5 Quiz
(a) Sketch a scroll type fuel pump, labelling the main components.(6)
(b) Explain how the pump sketched in part (a) may vary the end of delivery.(4)
Study Notes MDE Unit 5 Q6 Quiz
Explain, with the aid of labelled sketches, how a scroll type fuel pump meters the fuel for high and low loads.(10)
Study Notes MDE Unit 5 Q7 Quiz
Describe FIVE defects which may occur with main engine fuel injectors.(10)
Study Notes MDE Unit 5 Q8 Quiz
With reference to diesel engine crankcases:
(a) explain why crankcases may have relief valves fitted;(3)
(b) outline the circumstances which may cause the relief valves to operate;(5)
(c) state a safety detection system which may be fitted.(2)
Study Notes MDE Unit 6 Q1 Quiz
(a) Outline the actions which must be taken, by the on-watch engineer when the engine crankcase oil mist detector activates.(5)
(b) Sketch a crankcase explosion relief door, labelling the MAIN components.(5)
Study Notes MDE Unit 6 Q2 Quiz
The daily engine log shows the engine crankcase pressure gauge is indicating a much higher value than the normal reading.
(a) State the implications of this and the immediate actions that should be taken.(2)
(b) Outline the checks and investigations that should be undertaken to ascertain the cause of this increased crankcase pressure.(8)
Study Notes MDE Unit 6 Q3 Quiz
(a) Sketch an overspeed trip of the centrifugal type. (6)
(b) Describe the operation of the overspeed trip sketched in part (a). (4)
Study Notes MDE Unit 7 Q1 Quiz
Describe FOUR safety cut outs/trips which may be fitted to a diesel engine, explaining how EACH functions. (10)
Study Notes MDE Unit 7 Q2 Quiz
Describe a procedure for manually testing the set points on diesel generator HT cooling water, high temperature alarm and shut down.
Study Notes Quiz
Describe a procedure for manually testing the set points on diesel generator HT cooling water, high temperature alarm and shut down.
(10)
Study Notes MDE Unit 7 Q4 Quiz
Describe a procedure for manually testing the set points on a diesel engine lubricating oil low pressure alarm and shut down using a pressure calibrator.(10)
Study Notes MDE Unit 7 Q5 Quiz
List TEN safety devices that may be fitted to a propulsion engine and gearbox arrangement, stating a reason why EACH device is fitted.
(10)
Study Notes MDE Unit 7 Q6 Quiz
Explain the meaning of EACH of the following diesel engine terms:
(a) overlap;(2)
(b) scavenging;(2)
(c) afterburning;(2)
(d) compression;(2)
(e) expansion.(2)
Study Notes MDE Unit 8 Q1 Quiz
Explain what is meant by EACH of the following terms:
(a) cetane number;(3)
(b) calorific value;(3)
(c) density;(2)
(d) viscosity.(2)
Study Notes MDE Unit 8 Q2 Quiz
With reference to tube type heat exchangers, explain the purpose of EACH of the following:
(a) baffle plates;(2)
(b) sliding tube plate;(2)
(c) tell tale ring;(2)
(d) vent cock;(2)
(e) anodes.(2)
Study Notes MDE Unit 8 Q3 Quiz
With reference to diesel engines, explain EACH of the following terms:
(a) top dead centre;(1)
(b) bottom dead centre;(1)
(c) piston stroke;(2)
(d) swept volume;(2)
(e) clearance volume;(2)
(f) compression ratio.(2)
Study Notes MDE Unit 8 Q4 Quiz
With reference to distillate fuel oil, explain EACH of the following:
(a) why it often needs treatment before the engine;(6)
(b) why it sometimes needs cooling after the engine.(4)
MDE Unit 9 Q1 MDE Unit 9 Q1 Quiz
(a) List FIVE products directly obtained from the distillation of Crude Oil, stating a typical use for EACH on board a vessel.(5)
(b) With reference to ISO 8217, aluminium & silicon oxides in fuel, state EACH of the following:
(i) how they get there;(2)
(ii) what effect they will have on engine performance;(2)
(iii) how they are removed from the fuel.(1)
MDE Unit 9 Q2 MDE Unit 9 Q2 Quiz
With reference to microbial infestation of distillate fuel:
(a) describe what is meant by the term microbe;(1)
(b) state what microbes need to survive;(2)
(c) describe the possible diesel engine problems;(5)
(d) describe how it can be identified.(2)
MDE Unit 9 Q3 MDE Unit 9 Q3 Quiz
With reference to diesel engine fuel:
(a) explain the meaning of the term microbial contamination;(1)
(b) describe the possible problems the engine may encounter if the fuel received is contaminated with microbes;(4)
(c) explain how microbial contamination can be avoided;(3)
(d) explain the actions to be taken if microbial contamination is severe.
(2)
MDE Unit 9 Q4 MDE Unit 9 Q4 Quiz
(a) Explain what is meant by the term flashpoint of bunker fuel stored on board.(1)
(b) Describe the importance of knowing the flash point of the bunker fuel stored on board.(1)
(c) Describe a method in common use for ascertaining the flashpoint of bunker fuel.(4)
(d) State the SOLAS requirements, with respect to temperature, for storage of bunker fuel in an engine room.(4)
MDE Unit 9 Q5 MDE Unit 9 Q5 Quiz
With reference to distillate fuel, explain the potential problem for EACH of the following, stating how they may be avoided:
(a) flash point;(3)
(b) wax;(3)
(c) microbes.(4)
MDE Unit 9 Q6 MDE Unit 9 Q6 Quiz
Describe the engine and system problems created by EACH of the following common contaminants in distillate fuel oil:
(a) water;(3)
(b) solids;(3)
(c) microbes.(4)
MDE Unit 9 Q7 MDE Unit 9 Q7 Quiz
(a) Describe how contamination of fuel oil by EACH of the following can occur:
(i) microbes;(2)
(ii) sodium.(2)
(b) Describe how to avoid fuel system and engine related problems with reference to the TWO contaminants in part (a).(6)
MDE Unit 9 Q8 MDE Unit 9 Q8 Quiz
(a) Explain what is meant by EACH of the following fuel terms:
(i) cloud point;(2)
(ii) compatibility.(2)
(b) Describe how to avoid fuel system and engine related problems with reference to the TWO terms in part (a)(6)
MDE Unit 9 Q9 MDE Unit 9 Q9 Quiz
Describe, with the aid of a sketch, a typical distillate fuel supply system for a diesel engine, including ALL the safety devices.(10)
MDE Unit 9 Q10 MDE Unit 9 Q10 Quiz
With reference to distillate fuel oil material safety datasheets, describe with examples the information that would be included for EACH of the following:
(a) hazards; (4)
(b) first aid;(3)
(c) fire fighting measures.(3)
MDE Unit 9 Q11 MDE Unit 9 Q11 Quiz
(a) Describe TWO methods of cylinder liner lubrication in medium speed diesel engines.(6)
(b) Describe the possible effects of EACH of the following:
(i) insufficient lubrication;(2)
(ii) excessive lubrication.(2)
MDE Unit 10 Q1 MDE Unit 10 Q1 Quiz
(a) State FOUR functions of lubricating oil.(4)
(b) Explain EACH of the following terms:
(i) hydrostatic lubrication;(2)
(ii) boundary lubrication.(2)
(c) State ONE advantage and ONE disadvantage of using grease as a lubricant in a plain bearing.(2)
MDE Unit 10 Q2 MDE Unit 10 Q2 Quiz
With reference to diesel engine lubricating oil:
(a) state the main functions;(6)
(b) list FOUR contaminants that may be identified from laboratory analysis of a lubricating oil sample, stating their effects on the engine.(4)
MDE Unit 10 Q3 MDE Unit 10 Q3 Quiz
Describe, with reasons, FIVE properties required of lubricating oil.
(10)
MDE Unit 10 Q4 MDE Unit 10 Q4 Quiz
With reference to a gearbox:
(a) explain why large quantities of lubricating oil are used;(2)
(b) state FOUR possible causes of excessive lubricating oil temperature when at normal operating speeds;(4)
(c) state how EACH cause stated in part (b) may be remedied.(4)
MDE Unit 10 Q5 MDE Unit 10 Q5 Quiz
With reference to diesel engine lubricating oil:
(a) explain how the oil may become contaminated during service;(5)
(b) describe how to keep the oil in a satisfactory condition.(5)
MDE Unit 10 Q6 MDE Unit 10 Q6 Quiz
(a) Explain what is meant by microbial degradation of a lubricating oil.(4)
(b) State FOUR indications that could be observed if a lubricating oil was suffering from microbial degradation.(4)
(c) Describe TWO actions that should be taken on detecting the early start of microbial degradation of the main engine lubricating oil.(2)
MDE Unit 10 Q7 MDE Unit 10 Q7 Quiz
Explain the principle of operation of EACH of the following types of lubricating oil filter:
(a) magnetic;(2)
(b) centrifugal;(2)
(c) coalescer;(3)
(d) plate edge (eg auto-klean).(3)
MDE Unit 11 Q1 MDE Unit 11 Q1 Quiz
Describe, with the aid of a sketch, a coalescer type distillate fuel oil filter.(10)
MDE Unit 11 Q2 MDE Unit 11 Q2 Quiz
Describe, with the aid of a sketch, the operation of a centrifugal type lubricating oil filter, labelling the MAIN components.(10)
MDE Unit 11 Q3 MDE Unit 11 Q3 Quiz
(a) Describe FOUR factors influencing centrifugal separator efficiency.(4)
(b) Explain how oil loss occurs in a separator, stating how this can be minimised.(4)
(c) State the factors determining the discharge frequency of an engine lubricating oil purifier.(2)
MDE Unit 11 Q4 MDE Unit 11 Q4 Quiz
(a) Explain how the lubricating oil of a diesel engine may become contaminated with water.(6)
(b) Outline the problems that water in an engine oil may cause.(4)
MDE Unit 11 Q5 MDE Unit 11 Q5 Quiz
Describe how large medium speed diesel engine lubricating oil is kept in optimum condition.(10)
MDE Unit 11 Q6 MDE Unit 11 Q6 Quiz
Describe how the lubricating oil of a large medium speed diesel engine may be assessed on board.(10)
MDE Unit 11 Q7 MDE Unit 11 Q7 Quiz
With reference to plate type heat exchangers:
(a) sketch the assembly, labelling the main components and indicating the direction of flow;(5)
(b) state the materials used for the plates and seals;(2)
(c) state the purpose of the plates being corrugated;(2)
(d) state the purpose of tell tales.(1)
MDE Unit 12 Q1 MDE Unit 12 Q1 Quiz
(a) Describe, with the aid of a sketch, the construction of a plate type heat exchanger.(7)
(b) State THREE advantages of the plate types, compared with the tube type heat exchanger.(3)
MDE Unit 12 Q2 MDE Unit 12 Q2 Quiz
With reference to tube type heat exchangers, explain the purpose of EACH of the following:
(a) baffle plates;(2)
(b) sliding tube plate;(2)
(c) tell tale ring;(2)
(d) vent cock;(2)
(e) anodes.(2)
MDE Unit 12 Q3 Quiz
(a) State FOUR conditions for the fresh water cooling system treatment program to be effective.(4)
(b) State the function of the inhibitor used in fresh water cooling treatment.(3)
(c) Explain the safety considerations needed when handling the inhibitors.(3)
MDE Unit 13 Q1 MDE Unit 13 Q1 Quiz
With reference to diesel engine cooling water:
(a) explain why the water requires treatment;(6)
(b) describe the type of treatment that should be used.(4)
MDE Unit 13 Q2 MDE Unit 13 Q2 Quiz
(a) Describe, with the aid of a sketch, a keel type cooling water system, labelling the MAIN components.(6)
(b) Explain the purpose of EACH of the following in the cooling system:
(i) header tanks;(3)
(ii) vent lines.(1)
MDE Unit 13 Q3 MDE Unit 13 Q3 Quiz
With reference to the main engine cooling water systems:
(a) explain the purpose of the header tank;(4)
(b) explain why both heaters and coolers may be fitted;(4)
(c) state, with reasons, the type of pumps used.(2)
MDE Unit 13 Q4 MDE Unit 13 Q4 Quiz
Sketch a typical diesel engine cooling water system, describing the purpose of EACH component.(10)
MDE Unit 13 Q5 MDE Unit 13 Q5 Quiz
With reference to diesel engine water coolers:
(a) describe how performance is measured;(5)
(b) describe the possible causes of the performance falling off.(5)
MDE Unit 13 Q6 MDE Unit 13 Q6 Quiz
Describe, with the aid of a sketch, the operation of a diesel engine hydraulic oil start system, labelling the MAIN components, including all interlocks.(10)
MDE Unit 14 Q1 MDE Unit 14 Q1 Quiz
(a) Explain, with the aid of a diagram, the operation of a solenoid operated, battery powered electric starting system for an internal combustion engine.(6)
(b) Explain the term pre-engaged starter.(4)
MDE Unit 14 Q2 MDE Unit 14 Q2 Quiz
With reference to the operation of an air starting system of a large medium speed marine diesel engine fitted with individual air starting valves:
(a) state the checks to be carried out if the engine will not start when initiating the start sequence;(6)
(b) list FOUR safety devices fitted to the air start system.(4)
MDE Unit 14 Q3 MDE Unit 14 Q3 Quiz
(a) List FOUR safety interlocks that may be fitted to a direct air start medium speed diesel engine to prevent inadvertent starting during maintenance.(4)
(b) Explain, with the aid of a diagram, the opening period of an air start valve on a four stroke diesel engine in relation to the crank angle, inlet and exhaust valves.(6)
MDE Unit 14 Q4 MDE Unit 14 Q4 Quiz
Describe the checks and maintenance required for a main engine starting system that uses an air motor.(10)
MDE Unit 14 Q5 MDE Unit 14 Q5 Quiz
Describe the procedure to be adopted prior to removing a diesel engine cylinder head, including safety precautions.(10)
MDE Unit 15 Q1 MDE Unit 15 Q1 Quiz
(a) State the safety precautions necessary before removing a four stroke diesel engine cylinder head.(4)
(b) Explain the procedure for removing a four stroke diesel engine cylinder head.(6)
MDE Unit 15 Q2 MDE Unit 15 Q2 Quiz
Describe the inspection of a diesel engine piston that has already been removed from the engine.(10)
MDE Unit 15 Q3 MDE Unit 15 Q3 Quiz
(a) Describe how to calibrate a diesel engine cylinder liner, already removed from the engine.(6)
(b) State the precautions that should be taken during initial startup when putting a new liner into service.(4)
MDE Unit 15 Q4 MDE Unit 15 Q4 Quiz
(a) Describe the inspection of a cylinder liner and piston assembly, when the piston has been removed from the engine. (6)
(b) State possible faults which may be found.(4)
MDE Unit 15 Q5 MDE Unit 15 Q5 Quiz
(a) Describe the procedure for renewing a bottom end bearing of a diesel engine.(8)
(b) Describe the precautions necessary on initial startup of the engine.(2)
MDE Unit 15 Q6 MDE Unit 15 Q6 Quiz
Describe the possible causes and remedies for EACH of the following diesel engine faults:
(a) low lubricating oil pressure;(3)
(b) overheating;(3)
(c) unstable speed.(4)
MDE Unit 16 Q1 MDE Unit 16 Q1 Quiz
With reference to diesel engine high bearing temperatures:
(a) describe the possible causes;(5)
(b) explain the procedure to be adopted if detected.(5)
MDE Unit 16 Q2 MDE Unit 16 Q2 Quiz
With reference to leaking cylinder air start valves:
(a) describe how this may be detected whilst the engine is running;(2)
(b) describe the procedure on discovery;(4)
(c) list FOUR possible causes.(4)
MDE Unit 16 Q3 MDE Unit 16 Q3 Quiz
With reference to abnormal turbocharger vibration:
(a) explain the possible causes whilst operating at a steady speed;(5)
(b) describe how the causes explained in part (a) may be minimised.(5)
The air start pipework on a diesel engine attached to the cylinder head is becoming extremely hot.
Explain EACH of the following:
(a) the probable cause;(3)
(b) the consequences of this situation and the immediate action to be taken;(4)
(c) how this problem can be minimised.(3)
(a) State TWO possible causes for EACH of the following exhaust emissions:
(i) black smoke;(2)
(ii) blue smoke;(2)
(iii) white smoke.(2)
(b) State ONE remedy for EACH of the emissions in part (a).(3)
(c) State how combustion defects may be diagnosed.(1)
Describe the possible causes of abnormal diesel engine noises during operation.(10)
MDE Unit 16 Q7 MDE Unit 16 Q7 Quiz
Describe possible reasons for variations in the oil level of a main engine sump.(10)
MDE Unit 16 Q8 MDE Unit 16 Q8,9 Quiz
(a) Describe possible reasons for fluctuations in the oil level of a main engine sump.(8)
(b) State how spurious sump level alarms can be avoided.(2)
MDE Unit 16 Q9 Quiz
Describe the preparation and checks on a main propulsion system prior to going to sea.(10)
MDE Unit 16 Q10 MDE Unit 16 Q10 Quiz
With reference to fluid couplings for the main propulsion shaft:
(a) explain the principle of operation;(5)
(b) state how the transmitted torque may be varied;(2)
(c) state THREE advantages.(3)
MDE Unit 17 Q1 MDE Unit 17 Q1 Quiz
With reference to fluid couplings, explain the effects of EACH of the following:
(a) increasing oil flow between impellors;(3)
(b) increased oil temperature;(4)
(c) angular misalignment.(3)
MDE Unit 17 Q2 MDE Unit 17 Q2 Quiz
Sketch a fluid coupling, suitable for connecting an engine to a gearbox, labelling the main components.(10)
MDE Unit 17 Q3 MDE Unit 17 Q3 Quiz
With reference to an engine connected to a gearbox via a friction clutch, explain EACH of the following:
(a) why vibration from the engine should be damped;(7)
(b) how vibration damping is achieved.(3)
MDE Unit 18 Q1 MDE Unit 18 Q1 Quiz
Sketch a hydraulically operated, multi-plate, friction clutch, labelling the main components.(10)
MDE Unit 18 Q2 MDE Unit 18 Q2 Quiz
With reference to friction clutches, state EACH of the following:
(a) THREE advantages of a wet clutch;(3)
(b) THREE disadvantages of a wet clutch;(3)
(c) ONE advantage of multiple plates;(1)
(d) THREE disadvantages of multiple plates.(3)
MDE Unit 18 Q3 Quiz
With reference to pneumatically operated friction clutches, explain the effects of EACH of the following:
(a) oil contamination of friction pads;(3)
(b) reduced air pressure;(2)
(c) distorted friction pads;(2)
(d) angular misalignment.(3)
MDE Unit 19 Q1 MDE Unit 19 Q1 Quiz
With reference to pneumatic clutches used for medium speed main propulsion purposes:
(a) describe the operating principle of the clutch;(5)
(b) explain how this clutch may be engaged in the event of failure of the control system; (3)
(c) state TWO interlocks necessary for clutch operation.(2)
MDE Unit 19 Q2 MDE Unit 19 Q2 Quiz
With reference to a reduction gearing and pneumatic clutch arrangement of a propulsion system:
(a) state FIVE protection devices fitted;(5)
(b) explain the need for EACH device stated in part (a).(5)
MDE Unit 19 Q3 MDE Unit 19 Q3 Quiz
Describe, with the aid of a sketch, the operation of a diesel engine propulsion system air operated radial tyre type clutch.(10)
MDE Unit 19 Q4 MDE Unit 19 Q4 Quiz
(a) Describe a gearbox inspection. (6)
(b) State, with reasons, TWO gear tooth faults. (4)
MDE Unit 20 Q1 MDE Unit 20 Q1 Quiz
With reference to main reduction gearing:
(a) explain why lubricating oil should be supplied before the gearing rotates:(4)
(b) state the condition monitoring techniques that may be employed to assess the condition of the gearing.(6)
MDE Unit 20 Q2 MDE Unit 20 Q2 Quiz
With reference to reduction gears, state the advantages and disadvantages of EACH of the following:
(a) helical teeth compared with spur teeth;(5)
(b) double helix compared to single helix.(5)
MDE Unit 20 Q3 MDE Unit 20 Q3 Quiz
With reference to reduction gearing, explain EACH of the following:
(a) the purpose of the magnetic filter in the lubricating oil system;(3)
(b) why the surface finish of the gear teeth is important;(4)
(c) why EP lubricating oil is preferred.(3)
MDE Unit 20 Q4 MDE Unit 20 Q4 Quiz
Describe, with the aid of a sketch, an epicyclic planetary reduction gear.
(10)
MDE Unit 20 Q5 Quiz
(a) State how gearbox oil may become contaminated with water.(1)
(b) Explain the effects of water contamination of gearbox oil.(5)
(c) Describe the actions to be taken should a gearbox become contaminated with water.(4)
MDE Unit 20 Q6 MDE Unit 20 Q6 Quiz
(a) Sketch a block diagram of a lubricating oil system suitable for use with a reduction gearing, including all the protective devices.(5)
(b) State the engineering purpose/function of EACH item in the system sketched in part(a).(5)
MDE Unit 20 Q7 MDE Unit 20 Q7 Quiz
Explain why main reduction gearing uses oil sprayers for lubrication rather than rely on a wet sump and the gearing picking up oil as it rotates.(10)
MDE Unit 20 Q8 MDE Unit 20 Q8 Quiz
(a) Explain the difference between in line and vee type engines.(2)
(b) State the advantages of vee type engines.(2)
(c) Sketch TWO vee engine bottom end arrangement types.(6)
MDE Unit 21 Q1 MDE Unit 21 Q1 Quiz
Describe the principle of operation of a simple hydraulic governor.(10)