Which one of the following statement is not correct about acrylic fibre ?

The most widely used method of polymerisation for production of acrylic polymer is

Among the following given fibres, the crystallintyis developed while spinning at a speed of 3000 m/min under normal moisture containing environment for

The POY polyester yarn is produced in the range of

The zone of the extruder in which mostly melt is homogenized and has a drag flow is

The unit for specific flexural rigidity is