Question 28 (Textile Engineering & Fibre Science)
4.93 ktex sliver is fed in a rotor spinning machine with opening zone draft of 1400. The draft in the transport duct is 5 and the sliding draft on the rotor wall till the rotor groove is 2. If the back doubling within the rotor is 125, the approximate linear density (tex) of the output yarn is
| (A) | 44 |
| (B) | 39 |
| (C) | 24 |
| (D) | 29 |
[Show Answer]
Option A is correct.
Given-
Linear density of fed sliver=4.93 ktex
Opening zone draft=1400
Transport duct draft=5
Slidinng draft on rotor till rotor groove=2
No. of back doubling=125
Linear density of output sliver=?
Total draft=Opening zone draft x Transport duct draft x Slidinng draft on rotor till rotor groove/No. of back doubling
Total draft=1400 x 5 x 2/125
Total draft=112
By fromula-
Draft=Linear density of fed sliver/Linear density of output sliver
112=4.93/Linear density of output sliver
Linear density of output sliver=4.93/112
Linear density of output sliver=0.04401 ktex
Linear density of output sliver=44.01 tex (Ans)