71. Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is _________ as that of shaft A.
72. For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.
73. The volumetric strain is the ratio of the
74. The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
75. The extension of a circular bar tapering uniformly from diameter $${{\text{d}}_1}$$ at one end to diameter $${{\text{d}}_2}$$ at the other end and subjected to an axial pull of P is _________ the extension of a circular bar of diameter $$\sqrt {{{\text{d}}_1}{{\text{d}}_2}} $$ subjected to the same load P.
76. Longitudinal stress in a thin cylinder is
77. In the below figure, the stress corresponding to point ‘D’ is
78. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B'. The ratio of deflections in spring 'A' to spring 'B' is
79. Rivets are made of following type of material
80. The breaking stress is __________ the ultimate stress.
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