A tensile specimen with 20 mm gauge length was pulled with a nominal strain rate of 2.2 × 10-3/ sec. The true strain rate of the specimen at 2 mm extension is
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Metallurgical Engineering · all questionsMetallurgical Testing and Inspection
Metallurgical Testing and Inspection
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Magnetic particles testing is most likely to find subsurface discontinuities in
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A term which refers to the smallest detail visible in a radiograph is called
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A brittle material is mechanically tested in medium P in which it has surface energy γs = 0.9 J m-2. This material has a fracture strength of 300 MPa for a given flaw size. The same solid containing the same flaws is then tested in medium Q in which γs = 0.1 J m-2. The fracture strength (in MPa) in medium Q based on Griffith's theory is
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The decrease in fatigue life is due to
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For a given ductile materia, which one of the following tensile properties obtained with non-standard specimen is not comparable to that obtained with standard specimen?
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Match the following:
| P. Rockwell hardness | 1. Unrecovered projected area of indentation |
| Q. Knoop hardness | 2. Surface area of indentation |
| R. Vickers hardness | 3. Depth of indentation |
| S. Meyer hardness | 4. Projected area of indentation |
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The indentor used in the vicker's harness test is
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Which steel would you choose for Cyclic stress application?
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The ability of a material to resist deformations under the application of load is known as
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Which of the following statements is/are true for ultrasonic test?
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Radiographic appearance of inclusions resembles
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The tensile test of a sheet material exhibits 20% elongation in length and 10% decrease in width. The plastic strain ratio is
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The best method for determining the average hardness of an aluminium casting is
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Ultrasonic testing can be used for (choose the correct combination of the following statements P, Q, R, S):
P. Quantitative analysis of phases
Q. Determination of elastic constants
R. Determination of endurance limit
S. Detection of internal defects
P. Quantitative analysis of phases
Q. Determination of elastic constants
R. Determination of endurance limit
S. Detection of internal defects
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In fracture control design procedures, NDT plays an important role because it primarily enables to
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Match the following:
| Group 1 | Group 2 |
| P. Ultrasonic | 1. change in accoustic impedence |
| Q. Radiography | 2. change in thermal conductivity |
| R. Eddy current | 3. change in electrical conductivity |
| S. Magnetic particle | 4. change in density |
| 5. change in magnetic flux leakage |
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Match the NDT methods with the type of defects detected.
| NDT methods | Type of defects detected |
| P. Ultrasonic | 1. Internal |
| Q. X-ray | 2. Most |
| R. Eddy current | 3. External |
| S. Liquid penetrant | 4. Surface breaking |
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Radiography technique of detecting defects is based on the principle of
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What is the most common source of penetrant bath contamination
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