61. 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
62. Magnetic particles testing is most likely to find subsurface discontinuities in
63. A term which refers to the smallest detail visible in a radiograph is called
64. 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
65. The decrease in fatigue life is due to
66. 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?
67. 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
| 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 |
68. The indentor used in the vicker's harness test is
69. Which steel would you choose for Cyclic stress application?
70. The ability of a material to resist deformations under the application of load is known as
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