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Key Facts: Engineer Building Facilities Exam

80 items

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

Q-Net Engineer-grade grading method; Q-Net 건축설비기사 출제기준 period 2026.1.1–2029.12.31

120 minutes

Written timing at 30 minutes per subject

Q-Net 필기시험 접수안내 (기사·산업기사 과목별 30분)

40 / 60

Written per-subject floor and overall average

Q-Net 검정기준 및 방법 (기사)

KRW 19,400

Written registration fee on the Q-Net 건축설비기사 page

Q-Net crf005 jmCd=1632, checked 2026-09-20

KRW 22,600

Practical registration fee on the Q-Net 건축설비기사 page

Q-Net crf005 jmCd=1632, checked 2026-09-20

2 years

Written-pass exemption period from the pass date

National Technical Qualifications Act Enforcement Decree Article 21

건축설비기사 is HRD Korea's Engineer-grade building-facilities qualification. From 1 January 2026 the written paper is 80 four-option items in four subjects (20 each, 30 minutes each), with a 40-per-subject and 60-average pass rule, followed by a 3-hour written-answer practical in 건축설비설계 및 시공 실무. Official fees on Q-Net are KRW 19,400 written and KRW 22,600 practical. OpenExamPrep offers independent English MCQ study for the written topics, not an official translation or practical simulation.

Sample Engineer Building Facilities Practice Questions

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

1A composite exterior wall consists of 100 mm reinforced concrete [conductivity k = 1.6 W/(m·K)], 100 mm insulation board [k = 0.034 W/(m·K)], and 20 mm interior gypsum plaster [k = 0.20 W/(m·K)]. The indoor surface film resistance is R_si = 0.11 (m²·K)/W and the outdoor surface film resistance is R_se = 0.04 (m²·K)/W. What is the total thermal resistance (R_tot) of the wall?
A.3.25 (m²·K)/W
B.1.50 (m²·K)/W
C.0.31 (m²·K)/W
D.5.12 (m²·K)/W
Explanation: Total thermal resistance R_tot is the sum of surface air film resistances and material conductive layer resistances: R_tot = R_se + sum(d_i / k_i) + R_si. Concrete resistance: R_conc = 0.100 m / 1.6 W/(m·K) = 0.0625 (m²·K)/W. Insulation resistance: R_ins = 0.100 m / 0.034 W/(m·K) = 2.9412 (m²·K)/W. Gypsum resistance: R_gyp = 0.020 m / 0.20 W/(m·K) = 0.1000 (m²·K)/W. Total resistance: R_tot = 0.04 + 0.0625 + 2.9412 + 0.1000 + 0.11 = 3.2537 approx 3.25 (m²·K)/W.
2What is the physical relationship between thermal resistance (R) and thermal transmittance (U-value, 열관류율) of a building envelope assembly?
A.Thermal transmittance is independent of material thickness and depends solely on indoor humidity
B.Thermal transmittance is the mathematical reciprocal of total thermal resistance: U = 1 / R_tot
C.Thermal transmittance equals thermal resistance multiplied by wall surface area: U = R * A
D.Thermal transmittance is the square root of thermal resistance: U = sqrt(R)
Explanation: Thermal transmittance (U-value, 열관류율), expressed in W/(m²·K), quantifies the rate of steady-state heat transfer through a unit area of a building envelope structure induced by a unit temperature difference between indoor and outdoor air. It is mathematically defined as the exact inverse (reciprocal) of the total thermal resistance (R_tot, which includes interior and exterior air film boundary layers): U = 1 / R_tot.
3How is the Mean Radiant Temperature (MRT, 평균복사온도) defined in building environmental thermal comfort evaluation?
A.The temperature recorded by an unshielded mercury thermometer exposed to direct drafts
B.The boiling point of liquid refrigerant circulating inside radiant floor heating coils
C.The uniform surface temperature of an imaginary enclosure in which radiant heat exchange with the human body equals radiant exchange in the actual non-uniform environment
D.The arithmetic average of indoor dry-bulb and wet-bulb air temperatures
Explanation: Mean Radiant Temperature (MRT, T_mrt) is the uniform surface temperature of an imaginary blackbody enclosure that would exchange the same amount of net radiative heat with a human occupant as the actual real surrounding environment with its diverse, non-uniform surface temperatures (walls, windows, radiators, ceiling). It is typically measured using a standardized black globe thermometer (Vernon globe) coupled with air velocity and dry-bulb temperature readings.
4In building ventilation design, what aerodynamic driving mechanism produces the 'Stack Effect' (굴뚝효과, 연돌효과) in high-rise building vertical shafts (elevator hoistways, stairwells)?
A.Mechanical exhaust fans running at super-high static pressure in basements
B.Coriolis forces generated by earth rotation acting on tall building structures
C.Atmospheric humidity condensation releasing latent heat inside stairways
D.Air density differences between warm indoor air and cold outdoor air creating a vertical buoyancy hydrostatic pressure gradient
Explanation: The stack effect (굴뚝효과 / 연돌효과) is the natural vertical movement of air through building shafts (stairs, elevator shafts, service risers) driven by thermal buoyancy. In winter, warm indoor air is less dense than cold outdoor air (rho_indoor < rho_outdoor), creating positive pressure near the top of the building (exfiltration) and negative pressure near the ground floor (infiltration through entrance doors). The pressure differential is proportional to building height and temperature difference: delta P = C * h * (1/T_out - 1/T_in).
5Which mechanical ventilation system classification (기계환기설비 분류) provides mechanical supply fans combined with natural exhaust (or gravity relief dampers), maintaining a positive indoor air pressure (정압) relative to outdoors?
A.Class 2 mechanical ventilation (제2종 기계환기)
B.Class 1 mechanical ventilation (제1종 기계환기)
C.Class 3 mechanical ventilation (제3종 기계환기)
D.Class 4 natural ventilation (제4종 환기)
Explanation: In standard mechanical building ventilation taxonomy: Class 1 (제1종) uses mechanical supply and mechanical exhaust fans (balanced); Class 2 (제2종) uses mechanical supply fans with natural/relief exhaust, maintaining positive room air pressure (정압, +) to prevent unconditioned outdoor air, dust, or contaminants from infiltrating (used in clean rooms, hospital operating rooms, and precision labs); Class 3 (제3종) uses natural supply with mechanical exhaust fans, maintaining negative pressure (부압, -) to contain odors and moisture (used in kitchens and restrooms).
6In domestic water supply design for a high-rise building, why is the building vertically divided into multiple pressure zones (급수 조닝, Pressure Zoning)?
A.To prevent hot water from circulating during winter heating periods
B.To prevent excessive static hydrostatic pressure in lower-floor pipes that causes water hammer, pipe bursts, valve erosion, and splashing at faucets
C.To separate drinking water from toilet flush water into completely distinct municipal mains
D.To eliminate the need for water supply pumps on the upper floors
Explanation: Hydrostatic head increases by approx. 0.01 MPa (0.1 kgf/cm²) for every 1.0 meter of vertical water column height. In high-rise buildings, unrestricted single-zone supply would subject lower-floor plumbing to destructive static pressures (> 0.5 to 0.7 MPa), leading to severe water hammer, valve seat erosion, rapid joint leakage, and dangerous faucet water splashing. Vertical zoning (using separate booster pumps, gravity tanks, or pressure reducing valves PRV) restricts maximum static pressure at any fixture to 0.3 to 0.4 MPa.
7What is the Hunter Fixture Unit method (급수부하단위, Fixture Unit Method) used for in plumbing water supply system design?
A.To measure the acoustic decibel rating of bathroom water closet flushes
B.To determine the structural weight of copper pipes resting on seismic pipe hangers
C.To estimate peak design water demand flow rates based on statistical probability of simultaneous fixture usage
D.To calculate the total chemical chlorine residual needed for water disinfection
Explanation: Developed by Dr. Roy B. Hunter, the Fixture Unit (FU / WSFU) method assigns weight factors to various plumbing fixtures based on their discharge rate, duration of use, and frequency of operation. Because all plumbing fixtures in a building are never operated simultaneously, summing raw fixture flow rates would vastly oversize pipes. The Hunter method converts total accumulated fixture units into a realistic peak instantaneous design water demand flow (in L/min) using empirical probability curves.
8Which HVAC system is categorized as an All-Water System (전수방식)?
A.Single-duct constant air volume (CAV) system
B.Variable air volume (VAV) with central air handler
C.Dual-duct multi-zone central air system
D.Fan coil unit system without outdoor air ductwork (팬코일 유닛 방식, 2-pipe / 4-pipe)
Explanation: In HVAC taxonomy, systems are classified by the working fluid delivering heating and cooling to the conditioned space: All-Air (전공기), Air-Water (공기-수), All-Water (전수), and Refrigerant (냉매). An All-Water system uses fan coil units (FCUs) or convector radiators connected to central chillers and boilers via hydronic water piping alone, without any centralized outdoor air distribution ductwork (ventilation air must enter through openable windows or wall grilles).
9What is the primary operational advantage of a 4-pipe hydronic distribution system over a 2-pipe system for building fan coil units (FCUs)?
A.Simultaneous heating and cooling availability for individual zones with different exposures, eliminating seasonal changeover delays
B.50% lower initial capital expenditure for pipe materials and valves
C.Elimination of all terminal condensate drain pans in cooling mode
D.Operation without motorized two-way control valves at fan coil units
Explanation: A 2-pipe system has one supply pipe and one return pipe, forcing the entire building to operate in either heating mode or cooling mode with complicated seasonal changeover delays. A 4-pipe system provides dedicated chilled water supply/return lines AND separate hot water supply/return lines to each terminal FCU. This allows simultaneous cooling in solar-exposed south zones and heating in shaded north zones during shoulder seasons (spring/autumn), maximizing occupant thermal comfort.
10How does an Economizer Cycle (엔탈피 제어 이코노마이저) reduce mechanical chiller energy consumption in commercial building HVAC systems?
A.By spraying recycled sewage water directly across condenser refrigerant coils
B.By introducing up to 100% outdoor ambient air for free cooling when outdoor air enthalpy/temperature is lower than indoor return air
C.By reducing supply fan motor speed by 80% during summer peak hours
D.By heating outdoor intake air with electric resistance heaters prior to entering cooling coils
Explanation: An air-side economizer cycle (외기냉방 / 이코노마이저) uses modulated motorized dampers to introduce up to 100% cool outdoor air into the air handling unit when outdoor air temperature or enthalpy is lower than indoor return air conditions (typically below 15°C to 18°C during spring, autumn, and mild winter days). This provides 'free cooling' to dissipate interior core heat gains (lights, people, IT servers), allowing chillers and refrigeration compressors to shut down completely.

About the Engineer Building Facilities Exam

Engineer Building Facilities (건축설비기사) is South Korea's Engineer-grade national technical qualification for building mechanical, electrical, plumbing, and fire-protection systems, administered by HRD Korea on Q-Net under MOLIT. Q-Net lists a revised 출제기준 from 1 January 2026. The written paper uses four-option multiple-choice items. After a written pass, candidates sit a 3-hour written-answer practical examination in 건축설비설계 및 시공 실무. Q-Net publishes the specifications reviewed here in Korean. The questions on this page are independent English-language MCQ study practice for those written topics; they are not an official translation or format simulation and not a substitute for the practical stage.

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

Assessment

Written paper covering 건축설비계획, 건축설비설계, 전기설비 및 소방시설 일반, and 건축설비 관련법규 (20 items and 30 minutes each) from the 2026.1.1 출제기준, followed by a 3-hour written-answer practical examination in 건축설비설계 및 시공 실무. OpenExamPrep study weights below match those four equal written subjects.

Time Limit

120 minutes for the four written subjects (30 minutes each); practical: 3 hours written-answer

Passing Score

Written: 40+ per subject and 60 average; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 22,600 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%

Architectural Equipment Planning (건축설비계획)

Indoor thermal environment, air quality, water-supply and drainage planning, and HVAC system selection.

25%

Architectural Equipment Design (건축설비설계)

Thermodynamics, fluid mechanics, equipment and duct/pipe sizing, and design documentation.

25%

General Electrical and Fire Protection Facilities (전기설비 및 소방시설 일반)

Building power distribution, lighting, fire-alarm systems, and suppression installations.

25%

Architectural Equipment Related Laws (건축설비 관련법규)

Mechanical Equipment Act topics, Building Act equipment provisions, and energy-performance rules.

Preparing for the Engineer Building Facilities Exam

What You Need to Know

  • Passing score: Written: 40+ per subject and 60 average; practical: 60/100
  • Assessment: Written paper covering 건축설비계획, 건축설비설계, 전기설비 및 소방시설 일반, and 건축설비 관련법규 (20 items and 30 minutes each) from the 2026.1.1 출제기준, followed by a 3-hour written-answer practical examination in 건축설비설계 및 시공 실무. OpenExamPrep study weights below match those four equal written subjects.
  • Time limit: 120 minutes for the four written subjects (30 minutes each); practical: 3 hours written-answer
  • Exam / certification fees: KRW 19,400 written / KRW 22,600 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 Building Facilities: Suggested Study Strategy

1Keep all four 2026 subjects above the 40-point floor; a strong HVAC score cannot rescue a failed law paper.
2Work psychrometric, U-value, pipe-friction, and pump-head calculations with units shown end to end.
3Read 기계설비법 and energy-saving design standards as current MOLIT / law.go.kr text; drop any article number you cannot open.
4Use this English bank for concept drill. Official CBT still uses Korean equipment and statute wording.

Frequently Asked Questions

What is Engineer Building Facilities (건축설비기사)?

It is an Engineer-grade National Technical Qualification for building facilities, administered by HRD Korea on Q-Net, with MOLIT as the related ministry. Q-Net's English title is Engineer Building Facilities.

What changed for the 2026 written paper?

Q-Net lists a 건축설비기사 출제기준 effective 2026.1.1–2029.12.31. The written study outline used here is four subjects: 건축설비계획, 건축설비설계, 전기설비 및 소방시설 일반, and 건축설비 관련법규 (20 items each). After the written paper, the practical is a 3-hour written-answer examination in 건축설비설계 및 시공 실무.

What language is the official exam, and what is this bank?

Q-Net publishes the specifications reviewed here in Korean but does not state the permitted delivery language or a multilingual option on those sources. This page is independent English-language multiple-choice study practice for the named written topics. It is not an official translation or format simulation and not a substitute for the practical examination.

What are the 2026 fees and written timing?

The Q-Net 건축설비기사 page lists KRW 19,400 for the written paper and KRW 22,600 for the practical paper (checked 2026-09-20). Four Engineer-grade written subjects at 30 minutes each total 120 minutes.

How long does a written pass remain usable?

Under National Technical Qualifications Act Enforcement Decree Article 21, a written pass exempts that qualification's written paper for 2 years from the pass date.