tt 105 final fucking exam - QUIZZES

Question 1

Mechanical properties depends on?

Answer 1

All of the above

Question 2

The crystalline region in a polymer is where the chains are highly packed and oriented.

Answer 2

true

Question 3

If a yarn has a numerical description 2/100/38, what is the overall denier?

Answer 3

200

Question 4

Block-copolymer is made of long blocks of one monomer (e.g. A), followed by a long block of the other monomer

Answer 4

true

Question 5

Towels and sheets are example of?

Answer 5

Household and institutional textiles

Question 6

Choose the fibers that get stronger when wet.

Answer 6

cotton, linen

Question 7

When we draw filaments, we make them weaker.

Answer 7

false

Question 8

Polymer properties depend on:

Answer 8

Chemical structure, Crystallinity, Degree of polymerization, Polymer chain orientation

Question 9

Which characteristic will NOT happen when increase number of filaments:

Answer 9

Increase colorfulness

Question 10

Bicomponent filaments have two polymers inside the fiber instead of just one.

Answer 10

true

Question 11

A spun yarn with a CV% of 16% is not as uniform as a spun yarn with a CV% of 22%.

Answer 11

false

Question 12

Which list ranks the intermolecular forces in the order of INCREASING strength:

Question 13

Answer 12

an der Waals, dipole-dipole, H-bonding, ionic-ionic

Question 13

The tenacity of a fiber refers to how difficult to deform it.

Answer 13

false

Question 14

Wool is a natural cellulose fiber.

Answer 14

false

Question 15

Filament yarns cannot have a flat or textured appearance.

Answer 15

false

Question 16

Kevlar is made from a synthetic polymer and is normally used for regular apparels.

Answer 16

true

Question 17

The leather in a leather coat is a textile.

Answer 17

false

Question 18

Which of the following is NOT considered as Chemical Properties?

Answer 18

Affinity for oil

Question 19

Hardening point is where stress-strain curve begins to climb again.

Answer 19

true

Question 20

Threads (sewing threads) are used to produce fabrics, whereas yarns are used to join fabric parts together.

Answer 20

false

Question 21

In a bullet proof vest, you should use a fiber with high elongation.

Answer 21

false

Question 22

What is the total number of filaments in a 1/70/13 yarn?

Answer 22

13

Question 23

Polypropylene is a polymer made from the monomer propylene.

Answer 23

true

Question 24

Under an optical microscope cotton fiber look like collapsed drinking straws with twists known as convolutions.

Question 25

Answer 24

true

Question 25

Textile fibers have a length at least 50 times its diameter.

Answer 25

false

Question 26

Steep slope in the stress-strain curve means it is easy to stretch

Answer 26

false

Question 27

Supply chain management involves forecasting, purchasing, scheduling, financing, distribution and service.

Answer 27

true

Question 28

Nylon is produced by the dry spinning method of extrusion.

Answer 28

false

Question 29

The arrangement of yarns of fibers within a fabric is the definition of?

Answer 29

fabric construction

Question 30

Thermoplastic polymers can be wet spun into continuous filaments.

Answer 30

false

Question 31

Cotton is thermoplastic.

Answer 31

false

Question 32

The non-crystalline region of a polymer tends to absorb dye/pigments easier than the crystalline region.

Answer 32

true

Question 33

Decreasing the polyester in a polyester/cotton blend will (“Increase” OR “Decrease”) the yarn strength.

Answer 33

decrease

Question 34

What are the size of Microfiber and Nanofiber?

Answer 34

Less than 1 denier, Less than 0.3 µm

Question 35

Which of the following materials has the highest moisture regain?

Answer 35

wool

Question 36

When a filament yarn is drawn, what happens to it?

Answer 36

Increases in denier

Question 37

The type of a manufactured fiber or silk could be positively identified by its appearance under an optical microscope.

Answer 37

false