Free Practice Questions for Council of Engineers Thailand — Associate Engineer

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Sample Council of Engineers Thailand — Associate Engineer Practice Questions

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

1In a conventional engineering drawing, what does a thin dash-dot chain line used through the middle of a circular feature normally represent?

A.Center lines and axes of symmetry

B.Hidden contours and hidden edges

C.Cutting plane paths and direction of sight

D.Dimension lines and extension lines

Explanation: A thin dash-dot chain line identifies center lines, pitch circles, and axes of symmetry in conventional engineering drawings. It locates geometric centers without representing a visible edge of the part.

2A drafter places the view obtained from the right to the left of the front view. Using that same orthographic convention, where should the view obtained from above be placed?

A.Below the front view

B.Above the front view

C.To the right of the front view

D.To the left of the front view

Explanation: Placing the right-side view to the left identifies first-angle projection. In that convention, unfolding the projection planes places the top view below the front view. Keeping the convention consistent prevents a first-angle and third-angle layout from being mixed.

3What type of sectional view is created when the cutting plane passes entirely through an object along its centerline, dividing it into two halves?

A.Full section

B.Half section

C.Offset section

D.Broken-out section

Explanation: A full section is produced when the cutting plane extends completely across the object, usually along a principal plane of symmetry. Half of the object is imagined to be removed, revealing all interior features across the full view.

4In an engineering drawing, what is the primary purpose of a 'leader line'?

A.To connect a dimension or note to a specific feature on the drawing

B.To show the path of motion of a moving machine component

C.To divide a drawing sheet into coordinate grid zones

D.To indicate the exact boundary between two welded plates

Explanation: A leader line is a continuous thin line that directs attention from a text note, dimension, or symbol to a specific hole, surface, or mechanical feature. It terminates in an arrowhead when pointing to an edge or a dot when pointing inside a surface.

5On an isometric drawing, at what angle are the receding isometric axes oriented relative to the horizontal baseline?

A.30 degrees

B.45 degrees

C.60 degrees

D.90 degrees

Explanation: In the conventional isometric drawing layout, one axis is vertical and the other two are drawn at 30 degrees to the horizontal. Isometric views use equal foreshortening along the three principal directions. The requested angle is measured from the horizontal baseline, rather than from the vertical axis.

6What does a metric screw thread designation 'M10 x 1.25' denote?

A.A metric thread with a 10 mm nominal major diameter and a 1.25 mm pitch

B.A metric thread with a 10 mm core minor diameter and a 1.25 mm lead

C.A coarse metric thread with 10 mm length and 1.25 threads per centimeter

D.A multi-start thread with 10 mm pitch diameter and 1.25 mm thread depth

Explanation: In a metric thread callout, M identifies the metric thread profile and 10 is the nominal major diameter in millimeters. The value 1.25 specifies pitch: the axial distance between corresponding points on adjacent thread forms.

7A hole has limits of 25.000 mm to 25.021 mm, and a mating shaft has limits of 24.980 mm to 24.993 mm. What type of fit is produced between these two components?

A.Clearance fit

B.Interference fit

C.Transition fit

D.Shrink fit

Explanation: The minimum hole dimension is 25.000 mm and the maximum shaft dimension is 24.993 mm. Because the minimum hole is larger than the maximum shaft (minimum clearance = 25.000 - 24.993 = +0.007 mm), a clearance is guaranteed under all tolerance conditions, defining a clearance fit.

8In the ISO basic hole system of limits and fits, what is the defining characteristic of a fundamental deviation designated by the letter 'H'?

A.The lower deviation (EI) of the hole is zero, meaning the minimum hole size equals the basic size

B.The upper deviation (ES) of the hole is zero, meaning the maximum hole size equals the basic size

C.The tolerance band is positioned symmetrically about the zero line

D.The hole has a guaranteed negative allowance before assembly

Explanation: In the hole-basis system, H specifies a zero lower deviation, EI. The smallest permitted hole therefore equals the basic size, while the largest permitted hole is the basic size plus its tolerance.

9When drawing an offset section of a mechanical casting, how should the change-of-plane transitions (bends in the cutting plane) be shown in the resulting section view?

A.No solid lines should be drawn at the plane transitions, and hatch lines should maintain continuous direction across them

B.Thick solid lines must divide the section view at every 90-degree bend in the cutting plane

C.Cross-hatching must reverse angle by 90 degrees across every stepped transition line

D.Dashed hidden lines must be inserted at each cutting plane step

Explanation: An offset section steps the cutting plane to pass through off-axis internal features. In the resulting section view, the 90-degree step transitions are fictitious and must not be shown with solid or partition lines; section lining (hatching) continues uniformly across the part as if it were a single continuous cut.

10A shaft is dimensioned as 50 (+0.030 / -0.015) mm. What are its maximum material condition (MMC) and total tolerance?

A.MMC is 50.030 mm, and total tolerance is 0.045 mm

B.MMC is 49.985 mm, and total tolerance is 0.045 mm

C.MMC is 50.030 mm, and total tolerance is 0.015 mm

D.MMC is 50.000 mm, and total tolerance is 0.030 mm

Explanation: Maximum Material Condition (MMC) is the state in which a feature contains the maximum amount of material within its stated limits. For an external feature like a shaft, MMC corresponds to the maximum upper limit: 50 + 0.030 = 50.030 mm. The total tolerance is the difference between upper and lower limits: 50.030 - 49.985 = 0.045 mm.

About the Council of Engineers Thailand — Associate Engineer Exam

Independent practice by OpenExamPrep for the basic engineering category of the Council of Engineers Thailand Associate Engineer knowledge examination (การทดสอบความรู้ระดับภาคีวิศวกร, สภาวิศวกร). The official materials demonstrate Thai-language electronic MCQs. This is an English-language MCQ study adaptation, not an official translation or a simulation of the exam's language environment. Use separate preparation for the branch-specific examination and the required readiness training and assessment.

Exam sponsor: สภาวิศวกร (Council of Engineers Thailand - COE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The knowledge-examination route has a basic engineering category and a branch-specific category, each with 100 questions over three hours. Electronic delivery is the principal method. Eligible applicants may instead seek the certified-employment exemption. Both routes proceed through separate readiness training and assessment, including all five required video subjects. This bank covers basic engineering, with 25 independent practice questions per subject; it does not cover the branch-specific or readiness subjects.

Time Limit

3 hours (180 minutes)

Passing Score

At least 60% in each knowledge category; separate readiness assessment requires at least 60% in each assessed subject.

Exam / Certification Fees

THB 1,500 per knowledge-examination session, excluding payment-provider charges. Readiness training and assessment cost a separate THB 1,500; licensing and membership charges are additional.

Exam sponsor website

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

Official sources

COE Associate Engineer licensing: current procedure, fees, eligibility routes, and subject lists · Source checked 2026-10-18Current licensing procedure, two knowledge categories, the employment-certificate route, five readiness videos, and separate charges.
COE knowledge-examination regulations B.E. 2565, consolidated with amendments B.E. 2568 and B.E. 2569 · Source checked 2026-10-18Clauses 5, 7, 8, and 9 establish electronic delivery, scoring, the expanded basic-subject scope, and branch-specific subjects. The 2026 amendment revises the chemical-engineering category; that category is outside this bank's basic-engineering focus.
COE official online knowledge-examination candidate manual · Source checked 2026-10-18Pages 16 and 19 confirm 100 questions, four subjects of 25 questions, three hours, a 60% category pass threshold, and an illustrated Thai four-option interface. This manual predates the later scope amendments, which are checked separately.
COE readiness training and assessment regulation B.E. 2565 · Source checked 2026-10-18Clauses 6, 8, and 9 cover the readiness subjects, mandatory training attendance, and 60% pass requirement in each assessed subject. This is separate from the basic knowledge category.
NPTEL engineering drawing lectures · Source checked 2026-10-18Primary teaching reference for projection conventions; related lectures cover dimensioning, sections, and developments.
Autodesk AutoCAD documentation: model and layout scale · Source checked 2026-10-18Full-size model geometry and scaled paper-space views.
MIT OpenCourseWare: Solid Mechanics · Source checked 2026-10-18Primary teaching references for equilibrium, trusses, beam loads, stress, and strain.
NPTEL virtual work and stationary potential energy · Source checked 2026-10-18Admissible variations, virtual work, and stationarity of potential energy.
MIT OpenCourseWare: mechanical properties laboratory · Source checked 2026-10-18Mechanical-property definitions, tensile behavior, and elastic energy.
British Stainless Steel Association: sensitisation investigation · Source checked 2026-10-18Chromium-carbide precipitation, adjacent chromium depletion, and sensitisation-related intergranular corrosion.
American Welding Society: interpreting AWS A2.4 symbols · Source checked 2026-10-18Arrow-side and other-side placement for AWS A2.4 welding symbols.
KEYENCE GD&T fundamentals: maximum material condition · Source checked 2026-10-18Material-condition modifiers and the geometric-tolerance increase available as a feature departs from maximum material size.
WG14 public C11 committee draft N1570 · Source checked 2026-10-18Primary language reference for the explicitly identified C examples: integer arithmetic, arrays, pointers, function arguments, and control flow.
NIST AI evaluation program · Source checked 2026-10-18Independent evaluation data and prevention of train/test contamination.

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.

Practice: 25%

Engineering Drawing

25 questions on projections, sections, dimensions and tolerances, symbols, developments, drawing scales, and CAD.

Practice: 25%

Engineering Mechanics: Statics

25 questions on forces, equilibrium, trusses, beam loads, centroids, friction, virtual work, potential energy, and stability.

Practice: 25%

Engineering Materials

25 questions on mechanical properties, phase diagrams, heat treatment, metals, polymers, ceramics, composites, and degradation.

Practice: 25%

Computer Programming

25 questions on computer hardware and software, data representation, programming logic, C examples, and AI concepts and evaluation.

Preparing for the Council of Engineers Thailand — Associate Engineer Exam

What You Need to Know

Passing score: At least 60% in each knowledge category; separate readiness assessment requires at least 60% in each assessed subject.
Assessment: The knowledge-examination route has a basic engineering category and a branch-specific category, each with 100 questions over three hours. Electronic delivery is the principal method. Eligible applicants may instead seek the certified-employment exemption. Both routes proceed through separate readiness training and assessment, including all five required video subjects. This bank covers basic engineering, with 25 independent practice questions per subject; it does not cover the branch-specific or readiness subjects.
Time limit: 3 hours (180 minutes)
Exam / certification fees: THB 1,500 per knowledge-examination session, excluding payment-provider charges. Readiness training and assessment cost a separate THB 1,500; licensing and membership charges are additional. Official sources

Using Our Practice Resources

Work through all 100 available questions
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Council of Engineers Thailand — Associate Engineer: Suggested Study Strategy

1Review first-angle and third-angle views, sectioning, drawing scales, and full-size CAD modeling.

2Practice worked numerical calculations for 2D equilibrium, truss reaction forces, and centroid locations without relying on software.

3Use free-body diagrams and consistent units for force, moment, virtual-work, and potential-energy calculations.

4Interpret phase diagrams and connect processing to mechanical properties in metals, polymers, ceramics, and composites.

5Trace loop execution and conditional logic step-by-step to avoid off-by-one and indexing errors in programming questions.

6Review computer components, hardware/software roles, supervised-learning tasks, and independent model evaluation.

Frequently Asked Questions

Which engineering license in Thailand does this examination prepare for?

The exam belongs to the Associate Engineer licensing route (ระดับภาคีวิศวกร) administered by the Council of Engineers Thailand (สภาวิศวกร). This independent bank focuses on the four subjects in the basic engineering knowledge category. Branch-specific knowledge and readiness training and assessment require separate preparation.

Which assessment language is verified, and what language does this bank use?

The official candidate manual illustrates Thai-language questions and instructions. An official English sitting was not confirmed in the reviewed sources. Our bank is an independent English-language MCQ study adaptation, not an official translation or a simulation of the Thai-language examination environment.

What is the format and passing score of the official COE examination?

The knowledge-examination route has two categories: basic engineering and branch-specific engineering. Each has 100 questions over three hours and a 60% category pass threshold. Electronic delivery is the principal method. The separate readiness stage requires completion of training and at least 60% in each assessed subject.

Must every applicant take the knowledge examinations?

The current COE service page also describes an employment-certificate route. Applicants with at least 12 months of relevant engineering work may request exemption if their qualification and certified work record meet COE requirements. This is subject to Council review and does not remove the readiness training and assessment stage.

What happens after passing the knowledge examination?

Applicants proceed to separate training and professional readiness assessment (อบรมและทดสอบความพร้อมในการประกอบวิชาชีพ). The current procedure requires completion of all five video subjects before testing, followed by license approval and payment of the issuance fee. This basic-engineering bank is not a substitute for that training or assessment.