Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2182902 Process And Quality Control In Weaving Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2182902 Date: 29/11/2019
Subject Name: Process & Quality Control in Weaving
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Which loom mechanism/parts affect loom speed? Discuss any two in short. 03
(b) Calculate expected efficiency of a warping machine from following data:
Speed: 550 ypm Set length: 18000 m
Yarn length on cheese: 54000 m
No. of ends/beam: 540 End breaks/400 ends/1000 m: 2.4
Time to mend a warp break: 38 sec Time to change a beam: 400 sec
Time to change a creel: 2000 sec
Time loss due to miscellaneous causes/1000 m : 20 sec
04
(c) Explain variable staggering of healds and asymmetric shedding tappets. 07
Q.2 (a) Give equation to calculate operative efficiency. 03
(b) Following data is available from slub catcher:
No. of objectionable faults : 235 No. of knots put : 174
No. of objectionable faults removed by slub catcher : 65
Calculate clearing efficiency, knot factor and quality factor of the slub
catcher.
04
(c) Explain in detail various quality point about sizing beams. 07
OR
(c) Write in detail on stops on loom due to shuttle change and loss of efficiency
due to same.
07
Q.3 (a) What are the control measures related with yarn content on pirn? 03
(b) Discuss on weft tension control in shuttle 04
(c) Write a short note on effect of condition of machine on end breaks at
warping.
07
OR
Q.3 (a) Give equation to calculate tension during unwinding of a bobbin. Also
discuss effect of each parameter.
03
(b) Explain terms like clearing efficiency, knot factor, relative strength of
splice and clearing curve. What is the importance of these terms?
04
(c) Discuss effect of depth of immersion roller, level of size paste and density
of ends on average size pick up.
07
Q.4 (a) What is recommended creel tension level for warping? Give value of
tension and weight of discs for high speed warping for different count
groups.
03
(b) List causes & remedies for patterning damage occurring on wound
bobbins.
04
(c) Write a short note on hard waste control in weaving preparatory processes. 07
OR
Q.4 (a) Give sizing-weaving curve and hence discuss how optimum size pick up
level is decided?
03
(b) With sketch explain in short use of after waxing. How it helps in improving
performance at sizing?
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2182902 Date: 29/11/2019
Subject Name: Process & Quality Control in Weaving
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Which loom mechanism/parts affect loom speed? Discuss any two in short. 03
(b) Calculate expected efficiency of a warping machine from following data:
Speed: 550 ypm Set length: 18000 m
Yarn length on cheese: 54000 m
No. of ends/beam: 540 End breaks/400 ends/1000 m: 2.4
Time to mend a warp break: 38 sec Time to change a beam: 400 sec
Time to change a creel: 2000 sec
Time loss due to miscellaneous causes/1000 m : 20 sec
04
(c) Explain variable staggering of healds and asymmetric shedding tappets. 07
Q.2 (a) Give equation to calculate operative efficiency. 03
(b) Following data is available from slub catcher:
No. of objectionable faults : 235 No. of knots put : 174
No. of objectionable faults removed by slub catcher : 65
Calculate clearing efficiency, knot factor and quality factor of the slub
catcher.
04
(c) Explain in detail various quality point about sizing beams. 07
OR
(c) Write in detail on stops on loom due to shuttle change and loss of efficiency
due to same.
07
Q.3 (a) What are the control measures related with yarn content on pirn? 03
(b) Discuss on weft tension control in shuttle 04
(c) Write a short note on effect of condition of machine on end breaks at
warping.
07
OR
Q.3 (a) Give equation to calculate tension during unwinding of a bobbin. Also
discuss effect of each parameter.
03
(b) Explain terms like clearing efficiency, knot factor, relative strength of
splice and clearing curve. What is the importance of these terms?
04
(c) Discuss effect of depth of immersion roller, level of size paste and density
of ends on average size pick up.
07
Q.4 (a) What is recommended creel tension level for warping? Give value of
tension and weight of discs for high speed warping for different count
groups.
03
(b) List causes & remedies for patterning damage occurring on wound
bobbins.
04
(c) Write a short note on hard waste control in weaving preparatory processes. 07
OR
Q.4 (a) Give sizing-weaving curve and hence discuss how optimum size pick up
level is decided?
03
(b) With sketch explain in short use of after waxing. How it helps in improving
performance at sizing?
04
2
(c) Discuss causes and remedies for following defects:
(i) Weft Bar (ii) Weft Snarl
07
Q.5 (a) Write three points to control small weft loop (Phurkies) damage. 03
(b) What are the causes of tightness/slackness in shed connections? How ratio
of front and back heald shaft lift is calculated?
04
(c) Discuss in short what special care is required during weaving of Polyester
Filament yarn as weft in shuttle looms?
07
OR
Q.5 (a) What are the effects of reed parameters on weaving performance? What is
air space?
03
(b) What do you understand by smoothness of shedding in a loom? 04
(c) Write in detail on role of swell release mechanism in shuttle checking. 07
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This post was last modified on 20 February 2020