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Exam Review

Key Facts: Engineer Textile Exam

80 items

Official written paper length (4 subjects × 20 items, from 2026.1.1)

Q-Net Engineer-grade grading method; Enforcement Rule [별표 8]; Q-Net 섬유기사 page

120 minutes

Written examination duration (30 minutes per subject)

Q-Net 필기시험 접수안내 (기사·산업기사 과목별 30분)

40 / 60

Written per-subject floor (과락) and overall passing average

Q-Net 검정기준 및 방법 (기사)

KRW 19,400

Written registration fee on Q-Net 섬유기사 page

Q-Net crf005 jmCd=1297, checked 2026-09-20

KRW 61,300

Practical registration fee on Q-Net 섬유기사 page

Q-Net crf005 jmCd=1297, checked 2026-09-20

2 years

Written-pass exemption period from pass date

National Technical Qualifications Act Enforcement Decree Article 21

섬유기사 is HRD Korea's Engineer-grade qualification under 고용노동부 for textile engineering. The written CBT paper consists of 80 four-option questions across four subjects (20 questions each, 120 minutes total), requiring at least 40 points per subject (과락 floor) and an overall average of 60 points. A subsequent practical examination (KRW 61,300) is 섬유생산 및 염색가공 실무. OpenExamPrep provides 100 independent English practice MCQs covering those written topics.

Sample Engineer Textile Practice Questions

Try these sample questions to review concepts for the Engineer Textile exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In Textile Materials (섬유소재), cotton fiber is a natural cellulosic polymer. Which repeating chemical unit best describes the polymer backbone of mature cotton cellulose?
A.Amino-acid residues linked by peptide bonds
B.β-1,4-linked D-anhydroglucopyranose (cellobiose-based) units
C.Hexamethylene adipamide repeating units
D.Ethylene terephthalate ester repeating units
Explanation: Cotton cellulose is a linear polysaccharide of β-1,4-linked D-anhydroglucose units. Consecutive residues form the cellobiose repeat, with extensive hydrogen bonding that produces high crystallinity and moisture absorption. Peptide, nylon 66, and PET repeats belong to protein, polyamide, and polyester fibers respectively.
2Wool keratin (양모) owes much of its wet set, felting, and elastic recovery to which covalent crosslink in the cortex?
A.Disulfide cystine bridges between polypeptide chains
B.Ether links between cellulose chains
C.Ester links between PET chains
D.Ionic salt links only, with no covalent crosslinks
Explanation: Cystine disulfide bridges covalently crosslink keratin chains. Reducing or oxidizing those S–S bonds (as in setting, bleaching, or chlorination) changes wool's set, felting, and wet strength. Cellulose ethers, PET esters, and purely ionic bonding do not describe wool's covalent network.
3Raw silk (생사) consists of fibroin filaments cemented by sericin. Which statement is correct?
A.Sericin is the crystalline fiber-forming protein and fibroin is the gum
B.Both fibroin and sericin are thermoplastic polyesters
C.Fibroin is the fiber-forming protein and sericin is the water-soluble gum removed in degumming
D.Degumming dissolves fibroin and leaves sericin as the yarn
Explanation: Each Bombyx mori bave is a pair of fibroin filaments coated with sericin gum. Degumming (정련) hydrolyzes and removes sericin in soap or enzyme baths, leaving fibroin with luster and a triangular cross-section. Sericin is not the fiber former, and neither protein is a polyester.
4Polyethylene terephthalate (PET, 폴리에스테르) fiber is produced by polycondensation. Which pair of monomers yields the PET repeating ester unit?
A.Hexamethylenediamine and adipic acid
B.Caprolactam only
C.Acrylonitrile only
D.Terephthalic acid (or DMT) and ethylene glycol
Explanation: PET is the polyester of terephthalic acid (or dimethyl terephthalate) with ethylene glycol. After melt spinning and drawing, the oriented crystalline structure gives high tenacity and low moisture regain. Nylon 66, nylon 6, and acrylic use other monomers.
5How do nylon 6 and nylon 66 differ at the monomer level?
A.Nylon 6 is from caprolactam (one monomer); nylon 66 is from hexamethylenediamine plus adipic acid
B.Both are polyesters of ethylene glycol and terephthalic acid
C.Nylon 66 is a cellulose ester; nylon 6 is a protein
D.They are identical polymers named only by spinning speed
Explanation: Nylon 6 is a ring-opened polyamide from caprolactam (six carbons in the monomer). Nylon 66 is a condensation polyamide from a C6 diamine and a C6 diacid, giving an alternating 6,6 repeat. The two differ in melting point, dyeability details, and oligomer behavior, but both are polyamides, not polyesters or proteins.
6Lyocell (라이오셀) differs from conventional viscose rayon mainly because the cellulose is dissolved in which system?
A.Carbon disulfide / sodium hydroxide xanthate route
B.N-methylmorpholine N-oxide (NMMO) hydrate, with solvent recovery
C.Acetone solution of cellulose triacetate
D.Melt spinning of PET chips
Explanation: Lyocell dissolves wood pulp in NMMO hydrate and reconstitutes cellulose in a dry-jet wet spin bath, recovering the solvent. Conventional viscose uses CS2 xanthation and alkali cellulose. Acetone spinning is acetate, and PET is melt-spun polyester, not regenerated cellulose.
7Isotactic polypropylene (PP) staple used in textiles is characteristically:
A.Highly hydrophilic with commercial moisture regain near 8%
B.Readily dyed with anionic acid dyes without a carrier or pigment
C.Hydrophobic, chemically inert, and usually colored by mass pigmentation
D.A thermoset protein that felts like wool
Explanation: PP has no polar dye sites and near-zero moisture regain, so it is typically mass-pigmented. It is olefinic, chemically resistant, and lightweight (density ~0.91 g/cm³). It is not a protein and does not take acid dyes the way nylon or wool does.
8Under a longitudinal light-microscope view, mature cotton is most readily distinguished by which morphological feature?
A.Triangular cross-section with no lumen
B.A collapsed, twisted ribbon with a central lumen and reversals
C.A smooth glass-rod appearance with striations only
D.Cuticle scales overlapping toward the tip
Explanation: Cotton's secondary wall collapses on drying, producing a kidney-shaped cross-section, a lumen, and characteristic convolutions (twists) with reversal points. Silk is triangular, viscose is often striated and serrated, and overlapping scales identify animal hairs such as wool.
9Cotton cellulose is relatively resistant to alkali but is readily damaged by strong mineral acids. Why?
A.Acids hydrolyze the β-1,4-glycosidic bonds, lowering DP and tensile strength
B.Alkalis immediately dissolve crystalline cellulose at room temperature
C.Mineral acids esterify PET-type links in cotton
D.Alkali attack is always more severe than acid attack on cellulose
Explanation: Acid-catalyzed hydrolysis of glycosidic bonds shortens cellulose chains (hydrocellulose), dropping DP and strength. Dilute NaOH at room temperature swells cotton (as in mercerization) without rapidly dissolving native cellulose. Cotton is not a polyester, and alkali is not universally more damaging than acid under comparable conditions.
10Wool felting (축융) in aqueous mechanical action is primarily enabled by which surface structure?
A.Isotropic PET skin with no scales
B.Directional cuticle scales that produce a ratchet (differential friction) effect
C.A continuous sericin coating that melts at 60 °C
D.Cotton convolutions that reverse along the fiber
Explanation: Wool cuticle scales point toward the tip, so the with-scale / against-scale friction coefficients differ. In wet, warm, mechanical action, fibers migrate preferentially in one direction and lock into a felt. PET has no scales, sericin is silk gum, and cotton convolutions do not create a ratchet felt.

About the Engineer Textile Exam

Engineer Textile (섬유기사) is South Korea's Engineer-grade national technical qualification for textile engineers and materials technologists. Administered by HRD Korea on Q-Net under 고용노동부, the qualification tests textile materials, yarn and fabric production, dyeing and finishing, and textile testing. Following the 80-question written examination, candidates sit the practical examination 섬유생산 및 염색가공 실무. The questions on this page provide an independent English-language MCQ study adaptation for those written topics; they are not an official translation, format simulation, or substitute for the Korean written paper or practical stage.

Exam sponsor: HRD Korea (Q-Net) / 고용노동부 (Ministry of Employment and Labor). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written CBT covering Textile Materials (섬유소재), Textile Production (섬유생산), Dyeing and Finishing (염색가공), and Textile Testing (섬유시험) with 20 items and 30 minutes each (80 items / 120 minutes total), followed by the practical examination 섬유생산 및 염색가공 실무. OpenExamPrep study weights cover all four written subjects with 25 questions each.

Time Limit

120 minutes for the four written subjects (30 minutes each); practical timing follows the current Q-Net 출제기준 / session notice

Passing Score

Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 61,300 practical (Q-Net, 2026-09-20)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Textile Materials (섬유소재)

Polymer morphology, degree of polymerization, natural cellulosics (cotton structure, lumen, acid/alkali reactions; flax, hemp, ramie), natural proteins (wool ortho/paracortex, cuticle scales, disulfide crosslinks, felting; silk fibroin and sericin), regenerated cellulosics (viscose, modal, lyocell NMMO, cellulose acetates), commodity synthetics (PET, nylon 6/66, PAN, polypropylene, elastane), and high-performance fibers (para-aramid, meta-aramid, carbon fiber, UHMWPE).

25%

Textile Production (섬유생산)

Staple yarn processing (opening, carding, drawing, combing, roving, ring spinning), modern yarn formation (rotor, vortex, friction), yarn numbering (Tex, Denier, English cotton count Ne, metric count Nm), twist multiplier calculations, weaving preparation (winding, warping, sizing, drawing-in), loom motions (shedding, picking, beat-up, let-off, take-up), basic fabric weaves, crimp and cover factors, and knitting.

25%

Dyeing and Finishing (염색가공)

Preparatory treatments (singeing, desizing, scouring, peroxide bleaching, mercerization), colorant classes (direct, reactive, vat, acid, disperse), dyeing machinery (jet, jig, beam, pad-steam), and functional finishes (easy-care, water/oil repellent, flame retardants, antistatic agents).

25%

Textile Testing (섬유시험)

Standard atmospheric conditioning (20 ± 2 °C, 65 ± 4 % RH), moisture content versus moisture regain, tensile properties (CRE, CRT, CRL, tenacity, work of rupture), fabric mechanical testing (grab/strip tensile, Elmendorf tear, bursting, Martindale abrasion, pilling), colorfastness (washing, crocking, light), and quantitative chemical blend analysis.

Preparing for the Engineer Textile Exam

What You Need to Know

  • Passing score: Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100
  • Assessment: Written CBT covering Textile Materials (섬유소재), Textile Production (섬유생산), Dyeing and Finishing (염색가공), and Textile Testing (섬유시험) with 20 items and 30 minutes each (80 items / 120 minutes total), followed by the practical examination 섬유생산 및 염색가공 실무. OpenExamPrep study weights cover all four written subjects with 25 questions each.
  • Time limit: 120 minutes for the four written subjects (30 minutes each); practical timing follows the current Q-Net 출제기준 / session notice
  • Exam / certification fees: KRW 19,400 written / KRW 61,300 practical (Q-Net, 2026-09-20) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Engineer Textile: Suggested Study Strategy

1Master yarn numbering conversions (Tex, Denier, English cotton count Ne, metric count Nm) and cover-factor formulas; numerical items appear in both production and testing topics.
2Memorize standard testing conditions (20 ± 2 °C, 65 ± 4 % RH) and the distinction between moisture content (wet-mass basis) and moisture regain (oven-dry-mass basis).
3Protect against the 40-point per-subject floor (과락) by studying all four 2026 subjects rather than only the former five-subject titles that applied through 2025.12.31.
4Review dye-fiber chemistry and fiber solubility distinctions, which appear in both the materials/dyeing written topics and the practical 섬유생산 및 염색가공 실무.

Frequently Asked Questions

What is Engineer Textile (섬유기사)?

Engineer Textile (섬유기사) is South Korea's Engineer-grade national technical qualification for textile engineers, administered by the Human Resources Development Service of Korea (HRD Korea / Q-Net) under 고용노동부. It tests competence in textile materials, yarn and fabric production, dyeing and finishing, and textile testing.

What is the official written examination structure and passing standard in 2026?

From 2026.1.1 the written examination comprises 80 four-option multiple-choice questions across four subjects: Textile Materials (섬유소재), Textile Production (섬유생산), Dyeing and Finishing (염색가공), and Textile Testing (섬유시험) (20 questions each, 120 minutes total). Passing requires at least 40 points in every subject (과락 floor) and an overall average of 60 points or higher out of 100.

How is the practical examination (실기시험) administered for 섬유기사?

The practical examination is 섬유생산 및 염색가공 실무, as published in 국가기술자격법 시행규칙 [별표 8] for sittings from 2026.1.1. The practical requires at least 60 points out of 100. This OpenExamPrep bank does not simulate that practical stage.

What are the official registration fees and validity periods?

According to the Q-Net 섬유기사 qualification schedule checked on 2026-09-20 (jmCd=1297), the written examination fee is KRW 19,400 and the practical examination fee is KRW 61,300. Under Article 21 of the National Technical Qualifications Act Enforcement Decree, candidates who pass the written exam are exempt from retaking the written paper for 2 years from the written pass announcement date.

What language is the official examination conducted in, and how does this study bank help?

The official Q-Net examination is administered in Korean. OpenExamPrep provides an independent English-language MCQ study adaptation featuring worked calculations and Korean technical terms in parentheses. It is not an official translation, format simulation, or substitute for the Korean written paper or practical stage.