Difficulty: Easy & Basic
For a 1,000 m fibre sample weighing 1.2 g, calculate its tex.
A 1.2 tex
B 12 tex
C 120 tex
D 0.12 tex
Answer: A. 1.2 tex. Tex is grams per 1,000 metres, so the result is 1.2 tex.
Given 3 g over 9,000 m, what is the denier?
A 300 denier
B 3 denier
C 0.3 denier
D 30 denier
Answer: B. 3 denier. Denier is grams per 9,000 metres.
With 20 g over 10,000 m, what is the linear density in dtex?
A 2 dtex
B 200 dtex
C 2,000 dtex
D 20 dtex
Answer: D. 20 dtex. Dtex is grams per 10,000 metres.
If dry mass is 10 g and water gain is 0.8 g, find regain.
A 10 percent
B 8 percent
C 12.5 percent
D 0.8 percent
Answer: B. 8 percent. Regain is water mass divided by oven-dry mass, times 100.
For a 12 g conditioned specimen with 10 g dry mass, find moisture content.
A 16.7 percent
B 83.3 percent
C 8.3 percent
D 20 percent
Answer: A. 16.7 percent. Water is 2 g; dividing by 12 g conditioned mass gives about 16.7 percent.
Given a 40 mm mean and 4 mm SD, calculate CV.
A 4 percent
B 8 percent
C 16 percent
D 10 percent
Answer: D. 10 percent. CV equals standard deviation divided by mean, multiplied by 100.
Compute tenacity when a 2 tex fibre breaks at 6 N.
A 4 N per tex
B 8 N per tex
C 3 N per tex
D 2 N per tex
Answer: C. 3 N per tex. Tenacity is breaking force divided by linear density: 6 divided by 2.
Starting at 50 mm, the gauge length reaches 60 mm at break. Find elongation.
A 120 percent
B 10 percent
C 16.7 percent
D 20 percent
Answer: D. 20 percent. Extension is 10 mm; 10 divided by 50, times 100, equals 20 percent.
What device rapidly measures several cotton properties?
A High Volume Instrument
B Projection microscope
C Trash separator
D Electronic balance
Answer: A. High Volume Instrument. HVI reports length, uniformity, micronaire, strength and related cotton properties.
AFIS can measure which fibre defect?
A Twist tester
B Wrap reel
C AFIS
D Stelometer
Answer: C. AFIS. AFIS measures fibre length and maturity and can report trash and neps.
How can fibre diameter be directly measured?
A Projection microscope
B Airflow plug
C Wrap reel
D Moisture oven
Answer: A. Projection microscope. Projection microscopy can measure fibre diameter from an image.
For cotton length spread, which output is used?
A Colour fastness grade
B Yarn twist factor
C Fabric cover factor
D Length uniformity index
Answer: D. Length uniformity index. HVI length outputs include measures of average length and length uniformity.
How should fibres be selected from a lot?
A Only visible fibres
B Representative random sampling
C One end specimen
D Only longest fibres
Answer: B. Representative random sampling. Representative sampling limits selection bias when estimating lot properties.
Why maintain a standard atmosphere during textile tests?
A Change fibre chemistry
B Remove every fibre crimp
C Control moisture effects
D Increase polymer strength
Answer: C. Control moisture effects. Humidity affects textile moisture and can affect measured mass and properties.
What does a cut-and-weigh method estimate?
A Fibre maturity
B Fibre colour
C Linear density
D Surface friction
Answer: C. Linear density. A known length is weighed to calculate mass per unit length.
Regain expresses water relative to which mass?
A Original fibre length
B Gauge length
C Conditioned mass
D Oven-dry mass
Answer: D. Oven-dry mass. The denominator in moisture regain is the oven-dry mass.
Why hold gauge length constant in tensile tests?
A Increase yarn twist
B Enable fair comparison
C Change fibre diameter
D Remove sample moisture
Answer: B. Enable fair comparison. Different gauge lengths change measured extension and strength statistics.
How should a tester treat a specimen breaking at the jaws?
A Reject jaw break
B Count as normal
C Double the force
D Ignore the fracture
Answer: A. Reject jaw break. A jaw break can reflect clamping damage rather than valid gauge-section failure.
Comparable fibre tests require what sample preparation?
A Unequal specimen masses
B Random dye treatments
C Same conditioning atmosphere
D Different gauge lengths
Answer: C. Same conditioning atmosphere. Consistent conditioning reduces moisture-related differences between results.
How many dtex correspond to one tex?
A 10 dtex
B 100 dtex
C 1 dtex
D 5 dtex
Answer: A. 10 dtex. Dtex is measured per 10,000 m; tex is per 1,000 m.
In tex, what is one denier approximately?
A 0.5 tex
B 1 tex
C 0.111 tex
D 9 tex
Answer: C. 0.111 tex. A denier is grams per 9,000 m, which is one ninth of a tex.
Calculate tex for an 18 denier filament.
A 9 tex
B 2 tex
C 18 tex
D 0.2 tex
Answer: B. 2 tex. Convert denier to tex by dividing by nine.
In HVI length reporting, what averages the longer fibres?
A Mean cross-section area
B Upper-half mean length
C Lower-quarter mean length
D Median diameter
Answer: B. Upper-half mean length. Upper-half mean length averages the longer half of measured fibre lengths.
For tangled fibre knots, what count is reported?
A Crimp frequency
B Tenacity value
C Moisture regain
D Nep count
Answer: D. Nep count. AFIS can report the number of fibre neps in a tested sample.
Relative length spread is expressed by which statistic?
A Length CV percent
B Total bale volume
C Single break force
D Absolute fibre mass
Answer: A. Length CV percent. Length CV reports spread relative to mean fibre length.