There are 25 multiple choice questions. Each question is worth 4 points and it h

Question

There are 25 multiple choice questions. Each question is worth 4 points and it has only ONE correct answer. Which hardness test is appropriate for testing medium hard metal? a. Brinell b. Rockwell c. Vickers d. Knoop e. None of the above Which hardness test is appropriate for testing case-hardened materials? a. Brinell b. Rockwell c. Vickers d. Knoop e. None of the above HR_a 110 is approximately equal to a BHN of (From the estimate equation) a. 104.3 b. 165 c. 265 d. 365 e None of the above. Among all the different iron-carbon phases, which of the following phases is the softest? a Ferrite b. Austenite c. Pearlite d. Martensite Referring to the time-temperature transformation curve, which of the following cooling rates will result in full martensite? a. Line A b. Line B c. Line c d. None of the above

Explanation / Answer

1 Brinell is used to test the metals whcih are soft to medium hard.

2 Vickers Hardness Test is used for measuring the hardness of metals with extremely hard surfaces.

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