Mock exam paper C Higher Level Marking Scheme
PRE-JUNIOR CERTIFICATE EXAMINATION, 2013
MATERIALS AND TECHNOLOGY
METALWORK – HIGHER LEVEL
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Question One SECTION A
(a) (i) John P Holland – invented the submarine
(ii) Guiglielmo Marconi – invented wireless
(iii) Charles A Parsons – invented the steam turbine Any one @ 4 marks
(b) Compression Stroke (4 marks)
(c) Power Stroke (4 marks)
(e) Piston Rings are used used to provide a gas seal between the piston & the cylinder and also to prevent lubricating oil passing into the combustion chamber. 4marks
(f) Toughness: The ability of a material to withstand blows or an impact. The amount of energy required to fracture a material is an indication of its toughness.
Ductility:A material is said to be ductile when it can be permanently stretched without fracture by a tensile force. It is the ability to be drawn into a wire.
Conductivity:The ability of a material to allow heat or electricity to flow through it.
Elasticity:The ability of a material to return to its original shape when freed freom its distorting force.
4 marks @ 1 mark each
(g) Diagram drawn as below. One mark per correct component. One mark for diagram.
Question One SECTION B (Five parts only to count)
(a) (i) Length 80mm / Width 16mm
- Draw a centre line using the odd leg callipers
- Punch mark 8mm from top of the workpiece
- Position one leg of dividers on punchmark,
with other leg set to 8mm draw the arc. 2 marks
Once the axle support has been filed to its required shape the fold lines can be clearly marked using a scriber & try square at 18mm in from either end. Using folding bars in the vice & with the piece lined up at 90 degrees to the jaws of the vice bend the piece with a mallet. Turn over to bend the other side. Check angle using try square.
(c) Safety precautions to be observed incl...