【正确答案】The winding tension Tw in the yarn causes the traveller to slide around the ring which surrounds the bobbin, and centrifugal caused by the rotation of yarn enables the yarn to form a balloon between the traveller and the yarn lappet guide. The balloon top tension TO is larger than the balloon bottom tension TR because of the centrifugal force, the so called spinning tension TS between the lappet and the front roller nip is directly depends upon the TO, and for the four tensions, the largest one is Tw, and second one is TO, the least one is TS which has the direct effect on the end break in spinning.