71. The following thermo couple may be used for measuring temperature upto 1873 K.
72. Which of the following facts about dislocations is false?
73. A screw dislocation has
74. . . . . . . . . is that flow in which density fluid remains almost constant throughout flow.
75. Particulate reinforcements have . . . . . . . . dimensions in all directions.
76. . . . . . . . . decides the formation of vortex in stir casting process.
77. Attraction force between dislocations of opposite sign is . . . . . . . .
78. In general, strongest polymer group is
79. At steady state and when the inner and outer walls of a long hollow cylinder are kept at two different temperatures, the unidirectional temperature variation along the thickness of the wall is
80. A furnace wall is made of three materials (I, II and III) of equal thickness and having thermal conductivity k1 k2 and k3 respectively. The steady state temperature profile inside each material is shown in the figure. Thermal conductivities of the materials will vary as
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