Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2172903 Production Planning And Maintenance Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2172903 Date:21/01/2021
Subject Name:Production Planning & Maintenance
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write the equation for calculation of total number of ends and total number
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of picks in the fabric.
(b) Calculate number of Warping machines running at 550 mts/min with 51%
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efficiency and having 450 ends/beam with a set length of 25000 mts/beam to
receive the wound packages weighing 15000 kgs and having 30s yarn count
per day from a Unit having Winding machines.
(c) Prepare production schedule to produce 1200 kgs/shift of 60s Ne semi
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combed warp and 800 kgs/shift of 60s Ne semi combed weft on modern
spinning line.
Hence calculate number of bales required at Blow blow room if each bale is
of 200 kgs and trash removed at Blow room is 6%.
Q.2 (a) Calculate production of Carding machine per shift from following data:
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Hank of lap fed - 0.0014
Draft - 90
Efficiency - 85%
Doffer rpm - 40
Doffer diameter - 27 inch
(b) Calculate the weight of warp and weft threads to be required to produce 1.50
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lac metres of grey fabric per day having following details :
? Reed/Pick ? 96/56
? Warp/Weft ? 30s/36s
? Fabric Width ? 52 inches
(c) Calculate the number of Texturing machines each having 160 spindles and
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running at 1200 mts/min with 95 % efficiency to be required to supply 76
Denier warp & 76 Denier weft textured yarn per day to the Weaving unit
having following details :
240 Waterjet Weaving machines
running at 750 rpm to produce shirting fabric
Reed/Pick : 66/56
52 inches of width
94 % efficiency
Q.3 (a) State importance of maintenance in winding department.
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(b) Explain, in detail, the daily, weekly and monthly check points for warping
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machines.
(c) Calculate the number of sizing machines having following details to be
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required to supply sized beams per day to a weaving unit having 224 plain
power looms, weaving 60 picks/inch quality of fabric and running at 145
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rpm with 69% efficiency.
Sizing machine details :
speed -160 feet/min,
using 36s yarn count
efficiency % - 48
600 metres of warp sheet length per sized beam
3000 ends/beam
Q.4 (a) Calculate time after which the weft package is to be replaced using
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following details :
Speed rpm / Efficiency % -510/95
R. S. (cm) ? 140
Weft Denier ? 66
PPI ? 76
Weight of Yarn on package ? 1.2 kgs
(b) A mill wants to produce 6000 m of a particular fabric every day. Calculate
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no. of bobbins required from pirn winding department using following
details :
R.S.-48"
PPI?56
Count?36s Ne
Length contraction ? 5%
Weight of yarn on pirn ? 1.4 ozs
Pirn winding speed/Eff. ? 450 ypm / 72%
(c) Calculate allocation of looms for a weaving unit having plain power looms
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running at 140 rpm if the frequency of warp breaks, weft breaks, shuttle
change and weft change observed for 92,000 picks are found to be 19,9,63,
and 81 respectively.
Q.5 (a) Calculate the rpm of Air jet loom if the weft insertion rate is 2000
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metres/min and the fabric width is 56 inches. Assume efficiency of 97 %.
(b) Explain, in detail, the daily, weekly and monthly check points for sizing
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machines.
(c) A Yarn Preparatory Unit is having 6 Warping machines running at 550
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mts/min with 55 % efficiency and having 520 ends/beam with a set length of
24000 mts/beam. Calculate number of Winding machines each having 120
spindles and running at 1100 mts/min with 89% efficiency to be required to
supply wound packages having 30s yarn count per day to meet with the
requirements of the said Yarn Preparatory Unit.
Q.6 (a) Calculate length of roving available on roving bobbin from following data :
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Hank of roving- 1.2
T.M - 1.0
Spindle RPM - 1400
Efficiency - 90%
Time to fill one doff - 5 Hrs
(b) Discuss in detail maintenance of carding machine.
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(c) Prepare production schedule to produce 1000 kgs of combed yarn/shift of
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80s Ne. Assume noil 12 % .
Hence calculate number of comber required from following data:
Feed/nip - 8 mm
Nips / min - 350
Efficiency - 88%
Hank of lap fed - 0.016
Q.7 (a) Calculate number of laps produced in blow room/shift, if lap roller rpm is
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10, diameter is 10 inch, efficiency is 84% , length of lap is 40 mts , number
of scutcher are 2.
(b) Calculate production of Draw frame department having 2 Draw frames with
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twin deliveries, if hank of sliver delivered is 0.14, delivery speed is 800
mts/min, efficiency is 92%.
(c) Prepare spin plan to produce rotor spun yarn of 14s Ne warp & 16s Ne weft,
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if hank of lap used is 0.0012 and twist contraction is 5.5 % for warp and
5.2% for weft.
Q.8 (a) Calculate number of cans filled/shift at single delivery draw frame if can
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accommodates 5000 mts of drawn sliver. The draw frame is running at 600
mts/min and 90% efficiency.
(b) Following data refers to rotor spinning machine :
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Rotor Rpm ? 1,00,000
T.M ? 5.5
Count ? 24s Ne
Efficiency ? 90%
Calculate :
1) Production/rotor spindle /shift
2) Time to fill package of 1 kg
(c) A ring frame department is working with following parameters:
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Hank of roving fed - 1.4
Draft - 26
T.M - 4.0
Spindle rpm - 16000
Efficiency - 90%
Number of spindles /machine - 864
Calculate
production /spindle/shift .
number of spindles required for producing 1000kgs of yarn/day
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This post was last modified on 04 March 2021