Free Practice Questions for PEC EPE Textile

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More PEC Engineering Practice Examination (Pakistan)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

PEC EPE — Computer and Allied Engineering (Computer/Computer Systems/Software, Pakistan Engineering Council)

Practice Questions100 questions

PEC EPE — Electrical & Allied Disciplines (Pakistan Engineering Council)

Practice Questions100 questions

Sample PEC EPE Textile Practice Questions

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

1In microscopic assessment of swollen cotton fibers, which observation is consistent with greater secondary-wall maturity?

A.More developed secondary walls and a relatively smaller lumen than in immature fibers

B.Mature fibers dissolve completely while immature fibers remain insoluble

C.Mature fibers retain helical convolutions with a wide lumen occupying more than 75% of the cross section

D.Mature fibers exhibit negative birefringence while immature fibers show positive birefringence

Explanation: Cotton maturity concerns secondary-wall development. Mature fibers have more developed walls relative to their perimeter and lumen. Swelling aids microscopic assessment, but classification requires the selected method's definitions; wall thickness and lumen diameter should not be conflated.

2The Sheffield Micronaire instrument measures airflow through a 50-grain (3.24 g) plug of cotton fibers compressed to a fixed volume. Which two physiological fiber characteristics simultaneously govern this reading?

A.Linear density (intrinsic fineness) and secondary wall maturity

B.Mean staple length and fiber elongation at break

C.Upper half mean length and short fiber content

D.Tensile tenacity and convolution angle

Explanation: Micronaire operates on the Kozeny-Carman principle of fluid flow through porous media, where airflow resistance is directly proportional to the total specific surface area of the fiber plug. Because specific surface area depends on both perimeter (intrinsic genetic fineness) and secondary cell wall development (maturity), micronaire reflects a confounded combination of linear density and maturity.

3A raw cotton sample has an oven-dry weight of 25.00 g. After conditioning in standard atmosphere (65% RH, 20°C), its conditioned weight reaches 27.125 g. What is the moisture regain of the sample?

A.8.50%

B.7.83%

C.9.23%

D.10.85%

Explanation: Regain uses dry mass as its denominator: (27.125 - 25.000)/25.000 × 100 = 8.50%. A commercial allowance is a contractual or standards value, distinct from this measured regain.

4A consignment of 10,000 kg of cotton yarn is delivered with a measured moisture content of 6.0%. If the agreed commercial moisture regain for cotton yarn is 8.5%, what is the correct commercial invoice weight?

A.10,199 kg

B.9,400 kg

C.10,250 kg

D.9,770 kg

Explanation: Dry yarn mass is 10,000 × 0.94 = 9,400 kg. Applying the agreed regain allowance gives 9,400 × 1.085 = 10,199 kg invoice weight. This is the specified contract allowance, not a universal legal value.

5In Stelometer flat bundle testing at 1/8-inch (3.2 mm) gauge length, a cotton bundle of length 15 mm yields a breaking load of 6.0 kgf and a bundle mass of 3.0 mg. What is the bundle tenacity in cN/tex?

A.29.42 cN/tex

B.19.62 cN/tex

C.35.20 cN/tex

D.24.15 cN/tex

Explanation: The bundle linear density is 3.0 mg/0.015 m=200 tex. Force is 6.0 × 980.665=5883.99 cN. Tenacity is 5883.99/200=29.41995, rounded to 29.42 cN/tex. The supplied weighed bundle length, not the clamp gauge, sets this linear-density calculation.

6Polyethylene terephthalate (PET) polyester is synthesized industrially via melt polycondensation of purified terephthalic acid (PTA) and monoethylene glycol (MEG). Which parameter is primarily controlled to achieve a fiber-grade polymer suitable for high-speed spinning?

A.Intrinsic viscosity (IV), used as a proxy for molecular size and selected for the intended spinning process

B.Glass transition temperature depressed below 25°C

C.Polydispersity index increased to exceed 5.0

D.Melt index reduced to zero by adding polyfunctional branching agents

Explanation: Intrinsic viscosity reflects polymer molecular size under a specified solvent and temperature method and helps characterize processing behavior. Suitable IV depends on product, polymer formulation, spinning conditions, and equipment. It should not be converted into a universal weight-average molecular mass or one mandatory fiber-grade range.

7How do Nylon 6 and Nylon 6,6 fundamentally differ in chemical synthesis and crystalline melting temperature (Tm)?

A.Nylon 6 is produced by ring-opening polymerization of caprolactam (Tm ~ 215–220°C), whereas Nylon 6,6 is produced by step-growth polycondensation of hexamethylenediamine and adipic acid (Tm ~ 255–260°C)

B.Nylon 6 is synthesized by addition polymerization of ethylene oxide (Tm ~ 180°C), while Nylon 6,6 is synthesized by anionic condensation of sebacic acid (Tm ~ 290°C)

C.Nylon 6 has an alternating aromatic backbone (Tm ~ 300°C), while Nylon 6,6 is fully aliphatic (Tm ~ 200°C)

D.Nylon 6 contains 12 carbons per repeating unit, while Nylon 6,6 contains only 6 carbons per unit

Explanation: Nylon 6 is synthesized via hydrolytic ring-opening polymerization of epsilon-caprolactam (a single 6-carbon monomer) and has Tm ~ 215–220°C. Nylon 6,6 is produced by stoichiometric polycondensation of hexamethylenediamine (6 carbons) and adipic acid (6 carbons) forming nylon salt, yielding higher hydrogen bond symmetry and higher melting point Tm ~ 255–260°C.

8Commercial acrylic fibers contain at least 85% by weight of acrylonitrile units. What is the essential chemical function of incorporating an anionic comonomer such as sodium methallylsulfonate (0.5–2.0%) into the polymer chain?

A.It provides fixed negatively charged sulfonic acid sites for ionic dye bonding with cationic (basic) dyes

B.It acts as a plasticizer to lower the polymer degradation temperature below its melting point

C.It crosslinks polymer chains during wet spinning to prevent fibrillation

D.It eliminates the hydrophobic nature of polyacrylonitrile so it can be dyed with direct dyes

Explanation: Pure polyacrylonitrile homopolymer is highly crystalline and lacks accessible dyeing sites. Comonomers are incorporated in two roles: a neutral ester (e.g., methyl acrylate or vinyl acetate, 4–8%) to open the polymer matrix by disrupting nitrile-nitrile dipolar bonds, and an ionizable sulfonate comonomer (e.g., sodium methallylsulfonate or sodium styrene sulfonate, 0.5–2%) providing fixed negative anionic sites to bind cationic (basic) dyestuffs with high colorfastness.

9What structural feature of the wool fiber cortex is responsible for its natural three-dimensional helical crimp and moisture-driven differential swelling?

A.The bilateral cortical segmentation into ortho-cortex and para-cortex winding along the fiber length

B.The presence of a continuous central hollow lumen called the medulla

C.The epicuticle membrane composed of covalently bound fatty acid monolayers

D.The cross-striated beta-pleated sheets of alanine and glycine residues

Explanation: Wool cortex consists of two distinct segments: the ortho-cortex (lower sulfur, higher swelling, located on the outer curvature of the crimp) and the para-cortex (higher cystine crosslinking, lower moisture swelling, located on the inner curvature). This bilateral asymmetry spiraling along the fiber axis causes differential expansion upon moisture absorption, creating and regulating natural 3D crimp.

10During raw silk yarn degumming, which protein component is selectively removed from the bave, and what percentage of raw silk mass does it typically represent?

A.Sericin, representing approximately 20% to 25% of the total raw silk mass

B.Fibroin, representing approximately 75% to 80% of the total raw silk mass

C.Keratin, representing approximately 10% to 15% of the total raw silk mass

D.Collagen, representing approximately 3% to 5% of the total raw silk mass

Explanation: Raw silk bave extruded by Bombyx mori consists of two triangular fibroin filaments cemented together by a water-soluble gummy protein called sericin. Industrial degumming (boiling-off in weak alkaline or enzymatic soap baths) removes the sericin, which comprises 20–25% of the raw silk mass, leaving the pure, lustrous, high-strength crystalline fibroin cores.

About the PEC EPE Textile Exam

Textile Engineering is a named PEC EPE discipline for Registered Engineers progressing toward Professional Engineer registration. OpenExamPrep provides independent English-language MCQ study across fibers, yarn, fabric, processing, and garments. This bank surveys several optional Depth areas; it is not a single selected-Depth paper or a complete examination simulation.

Exam sponsor: Pakistan Engineering Council (PEC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Part-I closed-book MCQs, 2 hours; 90-minute break; Part-II open-book MCQs, 3 hours. Choose one Textile Depth area. The published EPE assessment does not list additional mandatory assignments, oral, practical, or case-study components.

Time Limit

3 hours (Part-II); 2 hours (Part-I), with a 90-minute break

Passing Score

60% in each part independently

Exam / Certification Fees

Rs. 5,000 new candidate; Rs. 2,500 single-part reappearance, plus bank charges

Exam sponsor website

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

Official sources

PEC EPE portal — 27th EPE, Fall 2026 · Source checked 2026-10-07
27th EPE notice — computer-based delivery and eligibility · Source checked 2026-10-07
27th EPE final application extension · Source checked 2026-10-07
PEC EPE Guidebook V2 · Source checked 2026-10-07
PEC Textile Engineering EPE syllabus · Source checked 2026-10-07Older publication still linked by PEC's EPE curriculum hub; verify any cycle-specific changes with PEC.

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.

38% of official Breadth

Engineering foundations

Mathematics 10%, statistics 6%, physics 6%, chemistry 10%, and computers 6%.

34% of official Breadth

Fibers and fibrous structures

Fiber science 10%, textile raw materials 14%, and mechanics of fibrous structures 10%.

28% of official Breadth

Color, utilities, and environment

Color science 7%, textile engineering utilities 14%, and environmental issues 7%. Breadth totals 25 MCQs.

35 of 60 official Part-II MCQs

Chosen Depth area

Choose Yarn Manufacturing, Fabric Manufacturing, Textile Processing, or Garment Manufacturing.

Preparing for the PEC EPE Textile Exam

What You Need to Know

Passing score: 60% in each part independently
Assessment: Part-I closed-book MCQs, 2 hours; 90-minute break; Part-II open-book MCQs, 3 hours. Choose one Textile Depth area. The published EPE assessment does not list additional mandatory assignments, oral, practical, or case-study components.
Time limit: 3 hours (Part-II); 2 hours (Part-I), with a 90-minute break
Exam / certification fees: Rs. 5,000 new candidate; Rs. 2,500 single-part reappearance, plus bank charges 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

PEC EPE Textile: Suggested Study Strategy

1Confirm your selected Depth area and any current syllabus updates with PEC.

2Keep tex, denier, English cotton count, efficiency, waste, and moisture bases explicit in calculations.

3Use the actual machine, chemical supplier, test edition, and product specification rather than memorizing universal process settings.

Frequently Asked Questions

How is the practice bank distributed?

The 100 items contain 42 foundation/Breadth and 58 Depth study items, approximating the general 25/35 split. Categories are 15 fibers, 15 mechanics/mathematics, 12 chemistry/process foundations, 20 yarn, 20 fabric, 3 applied processing, and 15 garment items. Chemistry and process topics overlap and are assigned editorially. These counts are not official subdomain percentages, and the collection spans multiple Depth options. Study the selected Depth outline and remaining Breadth outcomes such as utilities and general engineering foundations.

Which languages are officially available?

The reviewed PEC materials are in English, but they do not separately confirm assessment-language options. Our questions, instructions, and feedback are in English; this is independent study material rather than an official translation.

Is a manufacturing practical or oral assessment required?

PEC's published EPE assessment consists of two MCQ parts and does not list a separate mandatory manufacturing practical, oral, assignment, or case-study component. Relevant experience and CPD are eligibility requirements.

What may I bring to Part-II?

Bound textbooks, reference books, and standards are permitted under PEC's guidelines. Loose notes, laptops, and prohibited electronic devices are not permitted. Follow current PEC instructions for identification and simple calculator requirements.