7.1 State THREE different test results that can be obtained from a tensile tester - NSC Mechanical Technology Fitting and Machining - Question 7 - 2022 - Paper 1
Question 7
7.1 State THREE different test results that can be obtained from a tensile tester.
7.2 FIGURE 7.2 below shows a diagram of a Brinell hardness tester. Label A–C.
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Worked Solution & Example Answer:7.1 State THREE different test results that can be obtained from a tensile tester - NSC Mechanical Technology Fitting and Machining - Question 7 - 2022 - Paper 1
Step 1
State THREE different test results that can be obtained from a tensile tester.
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Answer
Yield stress: The maximum stress a material can withstand while being stretched or pulled before necking.
Ultimate tensile stress: The maximum stress a material can endure before failure after necking begins.
Elongation percentage: A measure of ductility defined as the change in length of a material after it has been pulled and is expressed as a percentage of the original length.
Step 2
FIGURE 7.2 below shows a diagram of a Brinell hardness tester. Label A–C.
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Answer
A - Work piece / Test piece
B - Steel Carbide ball / Indenter
C - Indentation diameter
Step 3
Calculate the cutting depth of a screw thread with a pitch of 1.75 mm.
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Answer
Cutting depth = 0.613 × pitch
Cutting depth = 0.613 × 1.75
Cutting depth = 1.07 mm
Step 4
Determine the depth micrometer reading shown in FIGURE 7.4 below.
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Answer
The depth micrometer reading is 17.36 mm.
Step 5
Describe the function of a moment tester.
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Answer
The function of a moment tester is to determine the reactions on either side of a simply loaded beam.
