## 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/mm^{2} and maximum shearing stress equal to 30 N/mm^{2} at a particular section. If the yield point in tension of the material is 280 N/mm^{2} and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

^{2}and maximum shearing stress equal to 30 N/mm

^{2}at a particular section. If the yield point in tension of the material is 280 N/mm

^{2}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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