61. When a half plane is inserted between two perfect planes then the defect arises in two plane perpendiculars to each other is called
62. The heat treatment process in which heating of steel is done to a temperature above the A3 temperature and it between 1000 - 1200°C and hold is for long time 10-20hr and followed by cooling is called
63. A large set of data for a given measurement has been found to be normally distributed around a mean 'μ' with standard deviation 'σ'. Which of the following limits would have about 95% of the data points around the mean and rest outside?
64. Two identical engineering components are made from alloys X and Y. The KIC of alloy X is greater than that of alloy Y. If these components are subjected to the same stress during operation under mode-I loading, which one of the following statements is true?
65. Cork is a good insulator because
66. Kevlar is commercial name for
67. For a steady state two dimensional in-compressible flow of liquid iron, the x component of the velocity is given by μ = 5xy2 - xy where x and y are rectangular co-ordinates.
Using the continuity equation, the y component of the velocity would be
Using the continuity equation, the y component of the velocity would be
68. The Kelvin is converted into Celsius
69. The two surfaces of a 5 mm thick plate of carbon steel are maintained at a carbon concentration of 104 mol. m-3 on one side and zero concentration on the other side. Taking the diffusion coefficient of carbon in austenite to be 10-11 m-2.s-1, the steady state flux (mol.m-3.s-1) through the thickness of the steel is
70. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the applied tensile strain then the poisson's ratio of the rod is
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