a) What you have learnt?

Ans:

1.torsional rigidity.

2. Specific torsional rigidity.

3. Breaking twist.

4. Breaking twist angle.

 and Math

b) Explain the term T_b ∞ 1/d.

Ans:

 # Breaking twist: The twist for breaking of a yarn is called breaking twist. It also can be defined as the number of twists required to break a yarn. Breaking twist depends on the diameter of fiber and it is inversely proportional to its diameter.

That is, T_b ∞ 1/d

Where, Tb = Breaking twist,

d = diameter of fiber.