CS/B.TECH(TT)/SEM-6/TT-601/2012
2012
YARN FORMATION – IV
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for the following : 10 × 1 = 10
i) Roving is used as feedstock in which of the following
type open-end spinning machine ?
a) Rotor spinning b) Air-vortex spinning
c) Electrostatic spinning d) Friction spinning.
ii) Opener roller speed (rpm) of rotor spinning is usually
ranging from
a) 1000-2000 b) 2500-3500
c) 4000-4500 d) 6500-8000.
iii) Which of the following is the feed roller surface
speed (m/min) of a rotor producing a yarn of 40 tex
from 4 ktex silver at a rate of 45 m/min ?
a) 0·4 b) 0·45
c) 0·5 d) 0·6.
iv) DREF-II spinning is categorised as
a) vortex spinning
b) false-twisted friction spinning
c) open-end friction spinning
d) false-twisted wrap spinning.
v) In Twilo process of twistless spinning, the parallel fibre