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Subject Code: 172903
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — SUMMER 2019
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Subject Name:Production Planning & Maintenance
Time: 02:30 PM TO 05:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q1
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(a) Calculate production of carding machine and number of cards required to produce 1600 kgs of carded sliver per shift using following data. Doffer rpm = 27, Doffer diameter = 27 inch, Hank of lap feed = 0.0016, draft = 95, efficiency=88%. [07]
(b) Calculate the number of automatic shuttle looms running at 220 rpm with 82% efficiency to be required to produce 5.00 lac meter of following variety of fabric per month. Reed/Pick = 70/42, Warp and Weft = 30s/32s Ne, Fabric width = 42 inches. [07]
Q2
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(a) Prepare spin plan for producing 40s carded warp yarn if lap weight is 14 oz/yard and twist contraction is 5%. [07]
(b) Calculate the number of Pirn winding machine each of 10 spindles to be required to supply pirns having 30s yarn count per day to meet the requirement of a weaving unit having 300 plain power looms each of 48 inches of width, 52 picks/inch and running at 125 rpm. [07]
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OR
(b) Prepare warp and weft production schedules using following details. No of loom = 350 projectile looms running-at 90% efficiency, Speed = 475 picks/min, Width of grey fabric = 3meters, warp/weft yarn denier = 600/400, Reed/Pick = 20/12. [07]
Q3
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(a) Prepare a production schedule for producing 800 kg of combed warp yarn and 600 kg of combed weft of 62s Ne on modern spinning line. [07]
(b) Prepare production schedule for producing 1200 kgs/shift of rotor spun yarn of 24s Ne warp using 30 mm cotton fiber. Calculate input required at Blow room. If each cotton bale is of 200kg. Calculate number of bales consumed/shift. [07]
OR
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(a) Calculate number of 2-for-1 twisting machines having 900 spindle rpm to be required to supply warp and weft yarn per day to a weaving unit to achieve 88% efficiency of 200 rapier weaving machines. Following variety of fabric is woven on the said weaving machines. Reed/Pick = 72/68, Warp/ Weft = 62 Denier 1800 TPM / 62 Denier 1600 TPM, Fabric Width = 51 Inches, Weave = Plain, Loom Speed = 500 rpm. [07]
(b) Prepare a spin plan for producing rotor spun yarn of 12s Ne warp yarn if cotton used is 1 inch staple and T.M. is 5.2. [07]
Q4
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(a) State the importance of maintenance in weaving industries. Explain in detail the daily, weekly, monthly, quarterly and yearly check point for weaving machines. [07]
(b) Calculate the weight of warp and weft threads to be required to produce 1.00 lac meters for grey fabric per day having following details. Reed / Pick = 80/52, Warp/ Weft = 40s/ 36s, Fabric width = 48 inches. [07]
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Date: 14/05/2019
Total Marks: 70
Q4
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OR
(b) A cloth 44.5” wide (including selvedge) is woven with 72” reed, 32s warp, 40s weft, 64 PPI, Denting — ends/dent (body), 4 ends/dent (selvedges are 0.25” on each side. Length of cloth piece = 120 yds, contraction = 7%. Calculate total weight of fabric and total ends in a fabric. [07]
Q5
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(a) Calculate the number of sizing machine required, running at 65 mts/min with 45% efficiency to supply sized beams to the weaving units. Automatic Shuttle loom speed =210 rpm, Efficiency = 86%, Reed/Pick = 60/40, Warp/ Weft = 40s/36s, Fabric width = 48 inch, Production requirement = 3.5 lac meters / month. [07]
(b) Calculate allocation of looms for a weaving unit having plain power looms running at 160 rpm. The frequency of warp breaks, weft breaks, shuttle change and weft change observed for 1, 10,000 picks are found to be 22, 14, 78 and 86 respectively. [07]
OR
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(a) Calculate the time required to exhaust one lap on carding machine from given data. Lap length = 45 yards, Draft = 80, Doffer dia = 27inch, Doffer rpm = 20, Efficiency = 80%. [07]
(b) Calculate production of ring frame and number of ring frame required for producing 100 kgs/shift. Count = 36s Ne , T.M. = 4.0, Spindle RPM = 16000, Efficiency = 90%, Number of spindles/ machine = 1024. [07]
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Calculate production of combers required to have 1200 kgs/shift production. Feed/Nip = 8mm, Nips/min = 240, Efficiency = 85%, Hank of lap fed = 0.016, Noil = 10%. [07]
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