Polar modulus is defined as the ratio of the polar moment of inertia to the radius of the shaft. It is also called as *torsional section modulus.* It is denoted by *Z*_{p}.

**1. For solid shaft**

**2. For hollow shaft**

Determine the diameter of a solid shaft which transmits 300 kW at 250 rpm. The maximum shear stress must not exceed 30 N/mm^{2} and the twist should not be more than 1° in a shaft length of 2 m. ...

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