## 61. Lewis form factor for 14½° 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

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