MMET 207 Lab Final Exam Questions With Correct Answers

MMET 207 Lab Final Exam Questions
With Correct Answers

What is the reason for hardness testing? - CORRECT ANSWER✔✔-to
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measure a metal's resistance to indentation
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What are the three methods of hardness testing? - CORRECT
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ANSWER✔✔-Rockwell, Brinell, and Vickers | | |




What is the minor load for the regular scale? - CORRECT ANSWER✔✔-
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10 kg
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What is the minor load for the superficial scale? - CORRECT
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ANSWER✔✔-3 kg |




What are the major loads for regular scale Rockwell? - CORRECT
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ANSWER✔✔-60 kg, 100 kg, and 150kg | | | | |




What are the major loads for superficial scale Rockwell? - CORRECT
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ANSWER✔✔-15 kg, 30 kg, and 45 kg | | | | | |

, What are the two types of indentors? - CORRECT ANSWER✔✔-diamond
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cone (brale) or hardened steel ball
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What is the notation for Rockwell A? - CORRECT ANSWER✔✔-HRA
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When is the minor load applied in hardness testing? - CORRECT
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ANSWER✔✔-while zeroing the scale | | |




What composes an HRA reading? - CORRECT ANSWER✔✔-diamond
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indentor, 60 kg major load | | | |




What composes an HRC reading? - CORRECT ANSWER✔✔-150 kg major
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load, diamond indentor
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What Rockwell scales use the superficial scale? - CORRECT ANSWER✔✔-
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N and T
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What are the steps to tensile testing? - CORRECT ANSWER✔✔-1. place
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machined specimen in tensile tester | | | |




2. apply tensile load, increasing until sample breaks
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3. during loading, at intervals measure tensile load and length
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4. after the sample breaks, but the broken ends together and measure
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length