61. Lewis form factor for $$14{\frac{1}{2}^ \circ }$$ composite and full depth involute system is (where T = Number of teeth)
62. The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
63. A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
64. The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity and n = Number of active coils)
65. For longitudinal joint in boilers, the type of joint used is
66. For circumferential joint in boilers, the type of joint used is
67. A column of length $$l$$ is fixed at both ends. The equivalent length of the column is
68. The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that
69. Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.
70. When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is
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