## 16. A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

## 17. The tension on the slack side of the belt is __________ the tension on the tight side of the belt.

## 18. When the belt is transmitting maximum power, the belt speed should be

(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

## 19. In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

## 20. Spring index is

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