Leaving Cert Engineering
Damian Keenan 2013
Instructions
• Answer Section A and Section B of Question 1
and FOUR other questions.
• All answers must be written in ink on the answer
book supplied.
• Diagrams should be drawn in pencil.
• Squared paper is supplied for graphs, as required.
• Please label and number carefully each question
attempted.
Q1 –
You must answer Section a & section B
• Section A
• Given 13 short questions – answer 10
• Read them all and pick the ten you know,
• Section B
• Basic principles of operation and applications
of the Stirling engine from its invention in 1816
to its modern uses.”
Q2 Material Testing
• 2012 –
• compare impact tests,
• Tensile tests on different materials- explain
brittleness-elastic and plastic states
• NDT, aircraft internal & external flaws – 2
types for each,
• Name one for internal faults in welded joints,
Q2 Material Testing
2011
• Metal fatigue & metal creep
• Compare Hardness testers – method of
measurement & test material
• Stress/ strain graph – find young's & proof
0.1% stress
• NDT – Explain why NDT, Describe a test using
ultrasonic
Q2 Material Testing
• 2010
• Why test metals till they break – id & describe
impact tester – how it works and why
• Load/extension graph – find UTS 0.1% proof
stress
• NDT – Describe Eddy Current testing – x ray
testing,
Q2 Material Testing
• 2009
• Hardness tester with diamond – identify &
describe features
• Stress/strain graph – id points on graph
(elastic, plastic)- describe shape of specimen
at middle and end
• NDT – why use in cast bike engines, describe a
test used on surface flaws in aluminium,
Q2 Material Testing
• 2008
• Micoscopic vrs macroscopic examination of
metals – explain Creep, 2 factors that
influence creep – compare indentors in
brinnel & vickers
• Stress strain graph, find youngs & 0.1% proof
stress
• Id NDT to determine surface & internal flaws
on casting – describe test to locate internal
defect
Q2 Material Testing
• 2006
• Compare Brinell & Vickers, explain elastic
limit, id 2 factors to prevent early fatigue,
• Load/extension graph – find tensile strength &
youngs
• NDT – why used in industry, describe test to
detect internal flaws.
Q3 heat treatment & iron carbon
•
•
•
•
2012
Describe – Annealing, normalising, carburising
Describe the flame hardening shown & use,
Name different regions of graph – describe
eutectic and eutectoid
Q3 Heat treatment & Iron Carbon
• 2011
• Describe Induction hardening - distinguish
grey & white cast iron – explain stress
relieving in metals
• Name different regions of graph – outline
cooling 0.4% steel from 900 degrees c
• Identify pyrometer and state function –
describe how it works using the pictures,
Q3 heat treatment & iron carbon
• 2010
• Compare Soaking & water cooling –
distinguish optical & thermo electric
pyrometer – describe normalising
• Name different regions of graph – describe
martinsite
• Describe heat treatment for slideways –
describe this process
Q3 heat treatment & iron carbon
• 2009
• Id 3 quenching media used in heat
treatments- discuss safety in case hardening,
discuss induction hardening, what is pearlite,
• Id heat treatment processes as temp zones
A,B,C,- explain Allotropy,
• Id pyrometer (thermo electric) – how does it
work,
Q3 heat treatment & iron carbon
• 2008
• Eutectic vrs eutectoid point, one method
measuring furnace temp, compare
microstructures martensite & ferrite, explain
recrystallisation in heat treatment
• Name different regions of graph – outline
cooling 0.4% steel from 900 degrees c
• Describe pack carburising, outline flame
hardening,
Q3 heat treatment & iron carbon
• 2007
• 2 methods measuring furnace temperature,
describe allotropy, explain soaking in
annealing, difference between grey and white
cast iron,
• Name different regions of graph – describe
eutectic and eutectoid (2012)
• Name 3 quenching media in terms of speed of
cooling, outline induction hardening,
Q3 Heat treatment & Iron Carbon
• 2006
• Select two temp zones on the dwg & explain
the treatment processes they represent,
• Compare – ferrite & martensite, upper and
lower critical temp, stainless steel & high
speed steel, eutectic & eutectoid point
• Optical pyrometer – id & state its function and
how it works,
Q5 Welding
• 2012
• Describe S.A.W. & where used
• Describe Colour coding oxyacetylene equip – 3
safety precautions preparation equip &
materials
• Describe multi run welds
• Describe auto welding of car panels,
• Describe main features of TIG & MMA
Q5 Welding
• 2011
• Describe MMA – identify & state function of
the MMA circuit,
• How minimise electrical hazards in MMA – 3
ways to prevent atmospheric contamination –
why TIG for Aluminium – Function of
Dissolved acetylene,
• Describe Seam welding & SAW
Q5 Welding
• 2010
• Name TIG & MIG – name application for each
and how they work,
• State (oxyacetylene equip) – 3 safety
precautions integrated into the equip – 2
functions of slag in MMA – Use for SAW,
Describe resistance welding
• Describe Electro-slag welding & oxyacetylene
• Or outline why robots for spray painting –
testing pipes or placing electronic parts,
Q5 Welding
• 2009
• Id Seam & spot welding, describe how they work
• Distinguish MIG & TIG - state 2 functions of
electrode coating in MMA – 2 factors when
installing a welding station in school – describe
multi run welds,
• Describe transformer circuit in MMA, S.A.W.
• Or advantage using air to power robots for
assembly – benefits using robotic control for
hazardous environments
Q5 Welding
• 2008
• Describe TIG using name, how it works, uses
• Oxyacetylene – 2 safety features in the equip,
explain two parts of the gauges, whats
dissolved acetylene, difference oxydising &
carburising flames
• Describe main features of spot welding & MIG
• Or 2 industrial uses where robots are used,
advantages of stepper motors in robots
Q5 Welding
• 2007
• SAW – Describe how it works and where used
• Redraw incomplete transformer circuit,
describe function of a & b, advantages multi
run welds, 3 safety precautions preparing
materials for welding
• Describe seam welding & electro slag welding
• Or 2 safety factors setting up robotic welding
facility,
Q5 Welding
• 2006
• MIG welding, name it , how it works, where its
used,
• MMA – 2 functions of electrode, 2 important
functions of the slag, explain bridge rectifier,
know 3 safety hazards and remedy for each,
• Describe spot welding & TIG
• Or benefits robots in car assembly, what is
‘working envelope’
Q6 Polymers
• 2012
• Describe compression moulding, polymer
used, and a component
• Distinguish thermo & thermosetting using
polymerisation process, bonding, structure,
properties
• Explain – elastomer, catalyst, blow moulding,
G.R.P. Laminate
Q6 Polymers
• 2011
• Describe Addition polymerisation, name a
material,
• Describe extrusion, state polymer, name
component
• Explain – Plasticiser, Filler, Lubricant, stabiliser,
pigment
Q6 Polymers
• 2010
• Identify calarindering and describe how it
works – name one part produced
• Distinguish thermo & thermosetting using
bonding, structure, properties (same as 2012)
• Explain – stabiliser, glass transition temp,
condensation polymerisation, elastomer, elastic
memory in perspex
Q6 Polymers
• 2009
• Id Calandering & extrusion, id one
component, describe how they work,
• Describe polymerisation for polyethylene
• Explain, Blow moulding, Elastomer, Catalyst,
Co –polymer, Thermosetting plastic,
Q6 Polymers
• 2008
• Extrusion–id function of 3 part, id a component
• Distinguish thermo & thermosetting using
polymerisation process, bonding, properties (2012)
• Explain Transfer moulding, GRP, Cross linking,
Laminate, Polymer filled materials
Q6 Polymers
• 2007
• Id & describe how transfer moulding works ,
name 1 component,
• State function of pigments, plasticisers, lubricants
• Explain condensation polymerisation, extrusion,
elastomers, van der walls forces, monomer,
Q6 Polymers
• 2006
• Distinguish thermo & thermosetting using
polymerisation process, bonding, internal
structure, properties, (2008)
• State function of fillers, stabilisers, catalyst,
foaming agent
• Describe injection moulding process, how it
works, one part produced, name some parts.
Q8 mechanisms
• 2012
• Describe ball bearings, vee belt pulleys
• Explain – idler gear, car batteries, ratchet &
pawl mechanism, heat sink in electronics,
advantages of solar panels,
• Describe method of independent drive to
each wheel of moon buggy
• Or electronics question
Q8 mechanisms
• 2011
• Describe bevel gears & roller bearings
• Explain vee pulleys, chain & sprocket, toggle,
LDR, function electronic transistor,
• Describe mechanism to control steering of gokart,
• Or electronics question
Q8 mechanisms
• 2010
• Identify Universal joint & cam shaft and cams
• Explain bevel gears, double acting cylinder,
clutch, idler gear, capacitor,
• Describe mechanism to control up & down
dentists chair,
• Or electronics – id circuit diagram
Q8 mechanisms
• 2009
• Id socket set ratchet & timing belt, suggest use
• Explain helical gears, preventing slip in pulley
belt system, crank & slider, integrated circuit,
solenoid,
• Describe mechanism to rotate jewellery box
• Or id & describe function of the electronic
components
Q8 mechanisms
• 2008
• Id and use for bevel gears & ball bearing
• Explain electrical relay, clutch, shuttle valve,
rack & pinion, capacitor,
• Describe a mechanism to lift heavy loads
• or id & describe function of the electronic
components
Q8 mechanisms
• 2007
• Id rack & pinion & worm gears, state where
used
• Explain Idler gears, Universal joint, solenoid,
pneumatic flow regulator, solar panel,
• Describe mechanism to automatically open a
door
• Or id & describe function of the electronic
components
Q8 mechanisms
• 2006
• Id Timing toothed belt & cam and follower
and give an application,
• Explain compound gear train, advantage gears
over pulleys, outline function of idler gear,
outline between bevel and worm gears,
describe 2 uses of rack and pinion mechanism
• Describe the operation of a power hacksaw
• Or id & describe function of the electronic
components,