Material Technology NCV Level 3 — Document
November 2019 — NCV Level 3 — Material Technology
NCV Level 3
2019
NCV Engineering
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Q1— Section header —
1.1.1 The ability of a material to return to its original shape after a load has been removed from it
1.1.5The ability of a metal to resist crushing forces ompressive strength
1.2Define the following physical properties of metals:
1.2.1 Density
1.2.2Melting point
1.2.3
1.3.1 Hardness
1.3.2Tensile strength
1.3.3Ductility
1.3.4
1.4puddling furnace is used for batch type melting of bronze or brass where the charge in the furnace is not heated by direct contact with the fire.
1.4.1 Explain how the charge is heated in the furnace. (2\
1.4.2Name TWO types of fuel used to fire puddling furnace. (2\
1.4.3The furnace is lined with firebricks on the inside. xplain the function or purpose of the firebricks in detail (3\
1.5Molybdenum is an alloy element used to change the mechanical properties of steel. State THREE positive changes that molybdenum, as an alloying element, can make to the mechanical properties of steel.
Q2— Section header —
2.1Indicate whether the following statements a re TRUE or FALSE. Cho ose the answer and write only 'True' or 'F alse' next to the question number (2. 1.
1.10\the ANSWER BOOK.
2.1.10Non metals are shown on the ri ght hand side of the periodic table. The symbol for Arsenic is Ar.
2.2Plastics are widely use d in industry today and are even sometimes used instead of metals.
2.2.1 Toughness is a property of plastics. Name FOUR other properties of plastics. (4\
2.2.2Name FOUR non engine related applications of plastics in the automobile industry
2.3Rubber has become a widely used substance in the industry and is well known for the manufacturing of tyres.
2.3.1 Name FOUR properties of rubber
2.3.2 Styrene butadiene rubber is one example of a synthetic rubber. Name THR EE other types of synthetic rubber. 3\ [25]25
Q3— Section header —
3.1.10Glass like waste product Water that contains salt Used to join two metals together Soak or dip into liquid to lower temperature Spoon
3.2The electric arc furnace is used to produce good quality alloy steels from scrap metal and operates in four stages. The FOUR stages are: Stage 1: (3.
2.1Stage 2: The carbon electrodes are lowered to the surface of the metal and melting starts. When the melting is complete, the slag float to the top. Iron ore is added to
3.2.1 xplain tage 1 of the electric arc furnace.
3.2.2Explain tage 3 of the electric arc furnace.
3.2.3Explain tage 4 of the electric arc furnace. (3\ (6021013\
3.3Heat treatment is a method used to alter the physical properties of materia ls.
3.3.1 Tempering is one example of a heat treatment method. Name T HREE other methods of heat treatment.
3.3.2Briefly explain the tempering process. (3\
3.3.3Name TWO dis advantage of the tempering process.
Q4— Section header —
4.1Complete the following sentences by filling in the missing word or word s from the list given below Write only the word or words nex
4.1.5\n the ANSWER BOOK. The Brinell hardness test is performed as fo llows: optically; dwell; staying 100 to 150; indenter; dividing;
4.1.2The force is maintained for a specified ti
4.1.4by using a portable microscope.
4.1.5
4.2The formula for calculating stress in a material is: What are the SI units of the stress , force and cros sectional area
4.3A Brinell hardness tester was used to test the hardness of a steel test piece using a 10 mm diameter steel ball. The value was 30. he d
4.3.1The load applied to the ball in kg. (2\
4.3.2The surface area of the impression accurate to three decimal places.
4.3.3The Brinell ardness umber accurate to three decimal places.
4.3.4The tensile strength of the hardened test piece accurate to two decimal places. Given:
4.4A force of 1 000 is applied to a circular work piece inducing a stress of 47,23
Mark Allocation
Sections25 + 25 + 25 + 25 = 100 marks
Paper information
TitleDocument
SubjectMaterial Technology
LevelNCV Level 3
Document typeQuestion paper
Year2019
MonthNovember
Pages8
Downloads3
Examination context
Decade2010s
Years ago7y
SeasonSpring (SH)
Start dayFriday
Exam periodNovember 2019
Days since exam2,535
About Material Technology examination preparation
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