63.
When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring ($$\delta $$) is given by (where d = Diameter of spring wire, n = No. of turns of the spring and C = Modulus of rigidity for the spring material)

68.
The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder? This stress is called

69.
A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at

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