15. Along the principal plarr subjected to maximum principal stress

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16. The ratio of the tensile stress developed in the wall of a boiler in the circumferential direction to the tensile stress in the axial direction, is

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17. If two tensile forces mutually perpendicular act on a rectangular parallelopiped bar are equal, the resulting elongation of the pipe, is

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18. A bending moment may be defined as :

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19. At either end of a plane frame, maximum number of possible transverse shear forces, are

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20. At either end of a plane frame, maximum number of possible bending moments, are

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21. A simply supported beam carries two equal concentrated loads W at distances L/3 from either support. The maximum is

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