QUIZ
module 1: Overview of nonwovens
Q1: Which of the following materials has least resemblance with nonwovens?
(i)Textile
(ii)Paper
(iii)Plastic
(iv)Ceramic
A1: (iv)
Q2: Which of the following standards has been adapted by ASTM for the definition of nonwovens?
(i)ISO
(ii)EN
(iii)DIN
(iv)None of them
A2: (iv)
Q3: Which of the following characteristics of a fibre is not considered to be a purely geometric characteristic?
(i)Surface area
(ii)Specific surface area
(iii)Surface area per unit volume
(iv)Perimeter
A3: (ii)
Q4: What is the fibre packing density of a polypropylene-fibre-based nonwoven that has 100 g/m2 basis weight and 2 mm thickness?
(i)0.0147
(ii)0.0362
(iii)0.0473
(iv)0.0542
A4: (ii)
Q5: What is the value of probability density function of isotropic fibre orientation?
(i)0.2345
(ii)0.3185
(iii)0.3569
(iv)0.4023
A5: (ii)
module 2: staple-fibre based nonwovens
Q1: Which of the following openers is most suitable for bleach cotton?
(i)Universal opener
(ii)Single roll opener
(iii)Multi-roll opener
(iv)All of them
A1: (iii)
Q2: Which of the following parameters is inversely related to opening intensity of an opener?
(i)Angular speed of opener
(ii)Rate of production
(iii)Distance between feed roller and opener
(iv)All of them
A2: (i)
Q3: Which of the following statements is correct?
(i)Higher speed of cross-lapper delivery roller results in higher inclination of fibres relative to the cross-direction of the cross-laid batt.
(ii)Higher speed of cross-apron results in higher inclination of fibres relative to the cross-direction of the cross-laid batt.
(iii)Higher width of the carded web results in higher inclination of fibres relative to the cross-direction of the cross-laid batt.
(iv)Higher width of the cross-laid web results in higher inclination of fibres relative to the cross-direction of the cross-laid batt.
A3: (ii)
Q4: Which of the following statements is correct?
(i)The higher aspect ratio of fibres results in worse quality of air-laid web than the lower aspect ratio of fibres.
(ii)The lower aspect ratio of fibres results in worse quality of air-laid web than the higher aspect ratio of fibres.
(iii)The aspect ratio of fibres does not play an important role in determining the quality of air-laid webs.
(iv) None of them.
A4: (i)
Q5: Which of the following statements is correct?
(i)The higher is the length of fibres the better is the quality of wet-laid webs.
(ii)The lower is the length of fibres the better is the quality of wet-laid webs.
(iii)The length of fibres does not play an important role in determining the quality of wet-laid webs.
(iv)None of them.
A5: (ii)
module 3: Web bonding processes
Q1: Which of the following types of bonding is followed by needlepunching?
(i)Mechanical bonding
(ii)Thermal bonding
(iii)Chemical bonding
(iv)None of the above
A1: (i)
Q2: Which of the following statements is correct?
(i)The single reduction needle has an intermediate section in-between shank and blade.
(ii)The single reduction needle is used for highly flexible fibres.
(iii)The single reduction needle is stiffer than the double reduction needle.
(iv)The single reduction needle is not stiffer than the double reduction needle.
A2: (iii)
Q3: Which of the following barbed needles provide the most aggressive punching?
(i)Regular barb
(ii)Medium barb
(iii)Close barb
(iv)High density barb.
A3: (iv)
Q4: Which of the following statements is true?
(i)The lower is the fibre linear density the higher is the numerical value of needle gauge.
(ii)The higher is the fibre linear density the higher is the numerical value of needle gauge.
(iii)The lower is the fibre linear density the lower is the numerical value of needle gauge.
(iv)The fibre linear density does not decide the selection of needle gauge.
A4: (iii)
Q5: Which of the following relationships exists between needle punch density and rate of production of needlepunching process?
(i)Linear
(ii)Exponential
(iii)Directly proportional
(iv)Inversely proportional
A5: (iv)
Q6: Which of the following statements is true in case of thermal calendar bonding process?
(i)There is no difference existing in-between center and surface of the web.
(ii)There is a significant temperature difference existing in-between center and surface of the web.
(iii)Point bonding results in stiffer fabrics as compared to area bonding.
(iv)None of the above.
A6: (ii)
Q7: Which of the following statements is true?
(i)The melting temperature of polypropylene increases with the increase in degree of compression.
(ii)The melting temperature of polypropylene decreases with the increase in degree of compression.
(iii)The melting temperature of polypropylene does not change with the degree of compression.
(iv)None of the above.
A7: (i)
Q8: Which of the following energy conversions takes place during ultrasonic bonding?
(i)Solar energy is converted to thermal energy.
(ii)Mechanical energy is converted to thermal energy.
(iii)Mechanical energy is converted to electrical energy.
(iv)Thermal energy is converted to mechanical energy.
A8: (ii)
module 4: polymer-extrusion based technologies
Q1: Which of the following statements is true for spunbond process?
(i)It requires thermoplastic polymers of low molecular weight.
(ii)It requires thermosetting polymers of low molecular weight.
(iii)It requires thermoplastic polymers of high molecular weight.
(iv)It requires thermosetting polymers of low molecular weight.
A1: (iii)
Q2: Which of the following process sequences is correct for spunbond process?
(i)preparation, extrusion, quenching, lay-down, bonding, drawing, winding.
(ii)preparation, extrusion, quenching, bonding, lay-down, drawing, winding.
(iii)preparation, extrusion, quenching, drawing, lay-down, bonding, winding.
(iv)preparation, quenching, extrusion, drawing, lay-down, bonding, winding.
A2: (iii)
Q3: Which of the following statements is true for meltblown process?
(i)It requires thermoplastic polymers of low MFI.
(ii)It requires thermosetting polymers of low MFI.
(iii)It requires thermoplastic polymers of high MFI.
(iv)It requires thermosetting polymers of high MFI.
A3: (iii)
Q4: Which of the following statements is true?
(i)The meltblown technology requires polymers with considerably higher melt viscosity as compared to spunbond technology.
(ii)The initial investment cost for spunbond technology is lower than that for meltblwon technology.
(iii)The meltblown process consumes more energy than the spunbond process.
(iv)The meltblown products are generally cheaper than the spunbond products.
A4: (iii)
module 5: finishing processes
Q1: Which of the following statements is true?
(i)Sueding is a process that is similar to singeing.
(ii)Sueding is a process that is similar to calendaring.
(iii)Sueding is a process that is similar to shearing.
(iv)Sueding is a process that is similar to raising.
A1: (iv)
Q2: What is the name of the process by which we apply chemical finishes to a fabric by using kiss roll?
(i)Welding
(ii)Coating
(iii)Lamination
(iv)micoencapsulation
A2: (ii)