Consider two shafts one solid of mild steel of 200 mm diameter and another hollow of alloy steel of which outer diameter is 200 mm. Ratio of different properties of hollow shaft to solid shaft are tabulated as follows: Properties Ratio of hollow to solid Allowable shear stress (max) Power (P) Rotational speed (N) 1.45 1.40 1.04 The maximum value of internal diameter of hollow shaft is mm. (Round off to two decimal places).

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.