Free Practice Questions for Fire Protection Electrical Engineer (소방설비기사 전기분야)

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Engineer Fire Protection System — Mechanical (소방설비기사(기계분야), South Korea)

Practice Questions100 questions

Exam Review

Key Facts: Fire Protection Electrical Engineer (소방설비기사 전기분야) Exam

120 Mins

Official written examination time limit for 80 questions across 4 subjects

HRD Korea / Q-Net

₩19,400

Official written examination application fee in South Korean Won

Q-Net Examination Guide

60% Avg

Passing mark across all 4 subjects with minimum 40% floor per subject

National Technical Qualifications Act

80 Qs

Total questions on official written exam (4 subjects × 20 questions)

Q-Net jmCd 1682

100 MCQs

Total practice questions in this OpenExamPrep English-language study bank

OpenExamPrep

Prepare for the Engineer Fire Protection System — Electrical (소방설비기사(전기분야), Q-Net jmCd: 1682) examination with 100 practice questions covering fire science, general electrical engineering, fire safety regulations, and electrical fire protection systems. Note: The real written exam has 80 questions and this bank provides 100 English-language practice MCQs as a study adaptation by OpenExamPrep.

Sample Fire Protection Electrical Engineer (소방설비기사 전기분야) Practice Questions

Try these sample questions to review concepts for the Fire Protection Electrical Engineer (소방설비기사 전기분야) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the standard South Korean fire safety classification system (소방기본법 및 화재안전기준), which match correctly pairs the fire classification letter with its fuel type and official identification color?

A.Class A (일반화재) – Ordinary solid combustibles (wood, paper, textiles) – White

B.Class B (유류화재) – Flammable liquids and gases – Blue

C.Class C (전기화재) – Energized electrical equipment – Yellow

D.Class D (금속화재) – Combustible metals (magnesium, sodium) – Black

Explanation: In South Korean fire safety standards and fire extinguisher labeling rules, Class A fires (일반화재) involve ordinary solid carbonaceous combustibles leaving glowing embers (ash) and are designated by the color White (백색). Class B fires (유류 및 가스화재) involve flammable liquids and gases and are designated by Yellow (황색). Class C fires (전기화재) involve energized electrical equipment and are designated by Blue (청색). Class D fires (금속화재) involve combustible metals like Mg, Na, K and have no standard color symbol (무색), while Class K fires (주방화재) involve cooking oils and edible animal/vegetable fats.

2What is the fundamental difference between the Fire Triangle (연소의 3요소) and the Fire Tetrahedron (연소의 4요소), and which combustion mode specifically requires the fourth component?

A.The Fire Triangle governs uninhibited chemical chain reactions (순조로운 연쇄반응), whereas the Tetrahedron governs deep-seated smoldering combustion.

B.The Fire Triangle applies exclusively to liquid fuels, while the Fire Tetrahedron applies only to Class D metal fires.

C.The Fire Tetrahedron includes uninhibited chemical chain reactions (연쇄반응), which is essential for flaming gas/vapor combustion but absent in glowing surface combustion.

D.The fourth element in the Tetrahedron is carbon dioxide concentration, which sustains glowing embers in charcoal fires.

Explanation: The traditional Fire Triangle comprises Fuel (가연물), Oxygen/Oxidizer (산소공급원), and Heat/Ignition Source (점화원). However, flaming combustion (불꽃연소) in the gas phase is sustained by free radical chain carriers (such as H•, OH•, and O• radicals). The Fire Tetrahedron adds uninhibited chemical chain reactions (순조로운 연쇄반응) as the fourth element. In surface combustion (표면연소 / 무염연소, such as glowing charcoal or coke), combustion occurs directly at the solid-gas interface without a flaming gas phase, requiring only the three triangle elements.

3Which of the following correctly describes the relationship between Flash Point (인화점), Fire Point (연소점), and Autoignition Temperature (발화점/착화점) for a typical liquid fuel?

A.Autoignition Temperature < Flash Point < Fire Point

B.Flash Point < Autoignition Temperature < Fire Point

C.Flash Point < Fire Point < Autoignition Temperature

D.Fire Point < Flash Point < Autoignition Temperature

Explanation: Flash point (인화점) is the lowest liquid temperature at which sufficient vapor is evolved to form an ignitable mixture with air that momentarily flashes upon application of an external ignition source. Fire point (연소점) is typically 5°C to 10°C higher than the flash point, where vapor generation is fast enough to sustain continuous combustion for at least 5 seconds after ignition. Autoignition temperature (발화점/착화점) is the minimum temperature required to initiate self-sustained combustion in the absence of an external spark or pilot flame, which is substantially higher than both the flash point and fire point (e.g., gasoline has a flash point of roughly -43°C, fire point ~ -35°C, but an autoignition temperature of ~280°C to 300°C).

4A combustible gas mixture consists of 80% methane (CH₄, lower explosive limit LEL = 5.0 vol%) and 20% hydrogen (H₂, lower explosive limit LEL = 4.0 vol%). Using Le Chatelier's formula (르 샤틀리에의 공식), what is the lower explosive limit (폭발하한계) of this binary mixture?

A.4.00 vol%

B.4.50 vol%

C.4.76 vol%

D.5.00 vol%

Explanation: Le Chatelier's formula for the lower limit of a flammable gas mixture is 100 / L_mix = Σ (V_i / L_i). Substituting: 100 / L_mix = (80 / 5.0) + (20 / 4.0) = 16.0 + 5.0 = 21.0, so L_mix = 100 / 21.0 = 4.76 vol%. The reciprocal form is required because the component with the lower limit contributes disproportionately; a straight volume-weighted average would give 0.8 × 5.0 + 0.2 × 4.0 = 4.80 vol%, which is close here only because the two limits are similar, and diverges sharply when they are not.

5Which flammable gas possesses the widest flammability range (폭발범위/연소범위) in air at atmospheric pressure among the following choices, posing extreme explosion hazards in industrial facilities?

A.Methane (메탄: 5.0% – 15.0%)

B.Propane (프로판: 2.1% – 9.5%)

C.Gasoline vapor (가솔린 증기: 1.4% – 7.6%)

D.Acetylene (아세틸렌: 2.5% – 81.0%)

Explanation: Acetylene (C2H2) has an exceptionally wide flammability range of approximately 2.5% to 81.0% by volume in air (span of 78.5%), and under elevated pressure can even undergo self-decomposition explosions without oxygen. By comparison, methane spans 10.0% (5–15%), propane spans 7.4% (2.1–9.5%), and gasoline vapor spans 6.2% (1.4–7.6%). Hydrogen (H2) also has a wide range (4.0–75%), but acetylene's upper limit of 81% is broader.

6According to the Stefan-Boltzmann law (스테판-볼츠만 법칙) governing thermal radiation, if the absolute temperature (절대온도, K) of a radiant flame surface triples (3T), by what factor does the total radiant heat flux (방사열량) emitted per unit area increase?

A.3 times

B.9 times

C.27 times

D.81 times

Explanation: The Stefan-Boltzmann law states that the emissive power of a blackbody or graybody is directly proportional to the fourth power of its absolute temperature: E = ε·σ·T^4, where ε is emissivity, σ is the Stefan-Boltzmann constant (5.67 × 10^-8 W/(m²·K^4)), and T is absolute temperature in Kelvin. If the absolute temperature triples (T' = 3T), the new radiant heat flux becomes E' = ε·σ·(3T)^4 = 3^4·(ε·σ·T^4) = 81·E. Hence, radiant heat output multiplies by 81 times.

7In compartment fire dynamics (구획실 화재거동), which physical phenomenon marks the sudden transition from the growth stage (성장기) to the fully developed fire stage (최성기), characterized by thermal radiation flux reaching approximately 20 kW/m² at floor level and upper hot gas temperatures reaching ~600°C?

A.Backdraft (백드래프트)

B.Boilover (보일오버)

C.Flashover (플래시오버)

D.Slopover (슬롭오버)

Explanation: Flashover (플래시오버) is the rapid transition from a localized fuel-controlled fire to a fully involved compartment fire where all exposed combustible surfaces ignite almost simultaneously. The accepted engineering criteria for flashover occurrence are an upper hot smoke layer temperature of 500°C to 600°C and radiant heat flux of approximately 20 kW/m² incident at the floor level. Backdraft, in contrast, occurs when air is suddenly introduced into an oxygen-depleted, ventilation-controlled smoldering space.

8Which set of pre-incident conditions and initiating events triggers a Backdraft (백드래프트) in an enclosed building fire?

A.Abundant fresh air supply, rapid flame propagation, and low carbon monoxide concentrations.

B.Rapid heat loss through broken exterior glass walls causing immediate gas condensation.

C.Oxygen starvation, heavy accumulation of unburned flammable pyrolysis gases and CO, followed by a sudden influx of fresh air.

D.Direct application of water spray onto burning molten electrical conductors.

Explanation: A backdraft occurs in a tight, unventilated compartment that has consumed nearly all available oxygen (falling below 10–14%), forcing flaming combustion to decay into smoldering. High concentrations of unburned vaporized fuels and carbon monoxide (CO) accumulate at elevated temperatures. When an opening is created (e.g., firefighters opening a door or a window breaking), the sudden inrush of oxygen rapidly mixes with the superheated gases and ignites explosively, producing a violent fireball pushing outward. Korean terminology: 산소 결핍, typically < 10–15%.

9The stack effect (연돌효과 / Chimney effect) drives significant vertical smoke movement in tall building shafts. Under winter conditions where interior building air is significantly warmer than exterior ambient air, which pressure and flow pattern occurs?

A.Air flows outward from shafts into lower floors and enters shafts from upper floors.

B.Air pressure inside the shaft is uniform from bottom to top, preventing any vertical air displacement.

C.Cold exterior air infiltrates through building openings at lower levels, moves upward through vertical shafts, and exhausts outward into upper levels above the Neutral Pressure Plane.

D.Warm air sinks toward the basement due to thermal inversion inside elevator hoistways.

Explanation: In winter, interior air is warmer and less dense than exterior air. The buoyancy force creates a vertical pressure gradient governed by ΔP = (ρ_out - ρ_in)·g·h. Below the Neutral Pressure Plane (NPP, 중성대), interior shaft pressure is lower than outside, causing cold air to infiltrate inward through lower doors and windows. The buoyant air rises through vertical shafts (stairwells, elevator shafts) and exerts positive pressure relative to the outside above the NPP, driving hot smoke into upper tenant floors and exhausting outward.

10What are the typical representative movement velocities of fire smoke horizontally across a floor corridor compared to vertically inside an open stairwell or vertical shaft?

A.Horizontal: 0.5 – 1.0 m/s; Vertical: 2.0 – 3.0 m/s (up to 3 – 5 m/s in violent thermal drafts)

B.Horizontal: 5.0 – 8.0 m/s; Vertical: 0.2 – 0.5 m/s

C.Horizontal: 0.1 – 0.2 m/s; Vertical: 0.1 – 0.2 m/s

D.Horizontal: 3.0 – 5.0 m/s; Vertical: 15.0 – 20.0 m/s

Explanation: In building fire safety engineering, horizontal smoke spread across level ceilings and corridors typically progresses at approximately 0.5 to 1.0 m/s (comparable to or slightly slower than normal adult walking speed of 1.0 to 1.2 m/s). Vertically inside stairwells, hoistways, and service ducts, thermal buoyancy and chimney effects accelerate smoke to 2.0 to 3.0 m/s, reaching up to 3.0 to 5.0 m/s under intense fire loads. This explains why unprotected vertical openings must be strictly fire-separated.

About the Fire Protection Electrical Engineer (소방설비기사 전기분야) Exam

Comprehensive practice bank and reference guide for the Engineer Fire Protection System — Electrical (소방설비기사(전기분야), Q-Net jmCd: 1682) examination administered by HRD Korea under the National Fire Agency (소방청). This preparation bank features 100 verified multiple-choice questions covering Principles of Fire Protection (소방원론: combustion chemistry, explosive limits, flash/autoignition points, heat transfer, fire classifications A/B/C/D/K, extinguishing mechanisms, smoke dynamics, and building stack effect), General Fire Electricity (소방전기일반: DC/AC circuit theory, Ohm's and Kirchhoff's laws, power calculations, three-phase wye/delta systems, single/three-phase voltage drop equations, transformer/motor operation, rectifiers, and electrical testing instruments), Fire-Related Regulations (소방관계법규: Framework Act on Fire Services, Act on Installation and Management of Firefighting Systems, Fire Construction Business Act, Hazardous Materials Safety Control Act, statutory fire safety manager appointments, and periodic inspections), and Structure and Principles of Fire Protection Electrical Systems (소방전기시설의 구조 및 원리: NFTC/NFPC national technical standards for automatic fire detection systems, P-type and R-type fire alarm control panels, manual call points, alarm bells and sirens, emergency broadcast systems, escape lighting and illuminated signs, and fire-resistant emergency wiring). Note: This practice bank is an independent English-language MCQ study adaptation by OpenExamPrep.

Exam sponsor: Human Resources Development Service of Korea (한국산업인력공단 / Q-Net) under National Fire Agency (소방청). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Administered under the National Technical Qualifications Act (국가기술자격법) and regulated by the National Fire Agency (소방청). The qualification comprises two stages: 1) Written CBT Examination (1차 필기시험: 소방원론 20 items, 소방전기일반 20 items, 소방관계법규 20 items, 소방전기시설의 구조 및 원리 20 items; 80 MCQs total in 120 minutes; passing criteria: minimum 40 points per subject and 60+ overall average on a 100-point scale); 2) Practical Examination (2차 실기시험: 소방전기시설 설계 및 시공 실무 / Fire Protection Electrical Facility Design & Construction Practice; 2.5-hour written descriptive and engineering calculation test; passing criteria: 60+ out of 100).

Time Limit

Official written exam: 120 minutes (80 questions total across 4 subjects; 30 minutes per subject)

Passing Score

Minimum 40% floor per subject (과락 방지) with 60% overall average across all 4 subjects

Exam / Certification Fees

₩19,400 KRW (Written) / ₩22,600 KRW (Practical)

Exam sponsor website

Reported exam pass rate: ~35–45% (Written) / ~20–30% (Practical). Written examination pass rates historically average between 35% and 45%, whereas the second-stage practical descriptive/calculation paper (소방전기시설 설계 및 시공 실무) is notably demanding, with pass rates fluctuating between 20% and 35% depending on exam round difficulty. This describes exam candidates, not OpenExamPrep users or results from using our resources. 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%

Principles of Fire Protection (소방원론)

Combustion chemistry, fire triangle and tetrahedron, flammable limits (연소범위) and Le Chatelier's formula, ignition mechanisms (flash point 인화점, fire point 연소점, autoignition temperature 발화점), heat transfer modes (conduction, convection, radiation), Class A/B/C/D/K fire classifications and color codes, extinguishing agents (water, carbon dioxide, halon alternatives, clean agent FK-5-1-12/IG-541, ABC dry chemical powder NH4H2PO4), and smoke generation, obscuration, and building stack effect (연돌효과).

25%

General Fire Electricity (소방전기일반)

Direct current (DC) and alternating current (AC) circuit theorems (Ohm's law, Kirchhoff's laws, Thevenin and Norton equivalents), sinusoidal AC quantities, active/reactive/apparent power (유효전력, 무효전력, 피상전력) and power factor correction (역률개선), series and parallel RLC resonance, balanced three-phase delta/wye systems, single-phase and three-phase voltage drop equations (e = 35.6LI/(1000A)), transformer operation and efficiency, induction motor torque and starting methods (wye-delta Y-Δ starting), semiconductor rectifiers, and electrical instrumentation (insulation resistance testing via Megger, ground resistance via earth tester).

25%

Fire-Related Regulations (소방관계법규)

Framework Act on Fire Services (소방기본법: firefighting operations, emergency dispatch orders, fire investigation, and warning zones), Act on Installation and Management of Firefighting Systems (소방시설 설치 및 관리에 관한 법률: designated fire-fighting targets 특정소방대상물, statutory fire safety manager appointments 1급/2급/3급, performance-based fire design, and annual comprehensive/actuation inspections 종합정밀점검/작동점검), Fire Construction Business Act (소방시설공사업법: licensing, supervision, construction subcontracting), and Hazardous Materials Safety Control Act (위험물안전관리법: Classes 1 to 6 hazardous materials classifications, designated quantities 지정수량, and storage safety distances).

25%

Structure and Principles of Fire Protection Electrical Systems (소방전기시설의 구조 및 원리)

National Fire Safety Technical and Performance Standards (NFTC / NFPC 201–205): Automatic Fire Detection Systems (자동화재탐지설비: differential rate-of-rise 차동식, fixed-temperature 정온식, photoelectric smoke 광전식, ionization 이온화식, and flame flame-detectors, detector ceiling height criteria and area allowances), fire alarm control panels (P-type vs R-type receivers P형/R형 수신기, multiplex signal communication), manual call points (발신기 M-type push buttons), sound alarm appliances (경종 bells, minimum 90 dB at 1m), emergency broadcast systems (비상방송설비: 1W indoor / 3W outdoor, 3-wire common/emergency/attenuator wiring), illuminated exit signs and emergency lighting (피난구유도등, 통로유도등, 유도표지, 비상조명등 with 20/60 min battery backup), and fire-resistant / heat-resistant emergency power wiring (FR-8 내화배선, HF-COE 내열배선).

Preparing for the Fire Protection Electrical Engineer (소방설비기사 전기분야) Exam

What You Need to Know

Passing score: Minimum 40% floor per subject (과락 방지) with 60% overall average across all 4 subjects
Assessment: Administered under the National Technical Qualifications Act (국가기술자격법) and regulated by the National Fire Agency (소방청). The qualification comprises two stages: 1) Written CBT Examination (1차 필기시험: 소방원론 20 items, 소방전기일반 20 items, 소방관계법규 20 items, 소방전기시설의 구조 및 원리 20 items; 80 MCQs total in 120 minutes; passing criteria: minimum 40 points per subject and 60+ overall average on a 100-point scale); 2) Practical Examination (2차 실기시험: 소방전기시설 설계 및 시공 실무 / Fire Protection Electrical Facility Design & Construction Practice; 2.5-hour written descriptive and engineering calculation test; passing criteria: 60+ out of 100).
Time limit: Official written exam: 120 minutes (80 questions total across 4 subjects; 30 minutes per subject)
Exam / certification fees: ₩19,400 KRW (Written) / ₩22,600 KRW (Practical) Official sources

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Fire Protection Electrical Engineer (소방설비기사 전기분야): Suggested Study Strategy

1Master Combustion Physics & Flammables in Subject 1 (소방원론): Memorize Le Chatelier's formula for gas mixtures, flammability limits (gasoline 1.4–7.6%, hydrogen 4.0–75%, acetylene 2.5–81%), flash vs fire vs autoignition points, and extinguishing agent chemistry (e.g., NH4H2PO4 for ABC dry powder, thermal decomposition products, and atmospheric lifetime of halon substitutes).

2Drill Quantitative Electrical Formulas in Subject 2 (소방전기일반): Be ready to solve single-phase and three-phase AC power calculations (P = √3·V_L·I_L·cosθ), voltage drops e = 35.6·L·I / (1000·A), conductor resistance R = ρ·L/A, capacitive and inductive reactance, series/parallel RLC resonance frequencies (f0 = 1 / (2π√(LC))), and induction motor slip s = (Ns - N)/Ns.

3Thoroughly Study the 4 Core Fire Statutes in Subject 3 (소방관계법규): Focus on designated fire-fighting targets (특정소방대상물), appointment timeframes for Fire Safety Managers (선임신고: within 30 days of vacancy, report within 14 days), penalties for unlicensed construction under the Fire Construction Business Act, and dangerous material classes and designated quantities (지정수량) under the Hazardous Materials Safety Control Act.

4Memorize NFTC Installation Criteria in Subject 4 (소방전기시설의 구조 및 원리): Internalize detector coverage areas per ceiling height (e.g., 차동식 스포트형 Class 1 in fire-resistant building < 4m covers 90 m²), P-type vs R-type receiver communication architectures, manual call point installation height (0.8m to 1.5m), sound alarm volume (≥90 dB at 1m), emergency broadcast 3-wire system (공통선, 업무용선, 긴급용선), and emergency power operating durations (20 mins general, 60 mins for high-rises ≥30 floors).

5Manage Time and Prevent Subject Failure (과락): With 80 questions in 120 minutes on the actual written test (1.5 minutes per question), swiftly solve qualitative regulatory and fire science questions first to preserve sufficient time for multi-step electrical circuit calculations.

Frequently Asked Questions

What is the Engineer Fire Protection System — Electrical (소방설비기사 전기분야) qualification?

The Engineer Fire Protection System — Electrical (소방설비기사(전기분야), Q-Net jmCd: 1682) is a premier national technical qualification administered by HRD Korea (한국산업인력공단) under the auspices of the National Fire Agency (소방청). It certifies high-level engineering competence in designing, constructing, supervising, inspecting, and managing fire alarm, detection, emergency broadcasting, exit guidance, and electrical emergency power systems in commercial, industrial, and residential buildings throughout South Korea.

What are the differences between the Electrical and Mechanical Fire Protection Engineer qualifications?

The Fire Protection Engineer qualification is split into two tracks: Electrical (전기분야) and Mechanical (기계분야). While both tracks share the same Subject 1 (Principles of Fire Protection) and Subject 3 (Fire-Related Regulations), the Electrical track focuses on Subject 2: General Fire Electricity and Subject 4: Fire Protection Electrical Systems (automatic fire detection, P/R-type receivers, exit lights, emergency broadcasting). The Mechanical track covers Fluid Mechanics (유체역학) and Mechanical Fire Systems (sprinklers, standpipes, water mist, foam, clean agent extinguishing, and smoke exhaustion fans). Holding both certifications qualifies an engineer as a 'Double Fire Engineer' (쌍기사), commanding premium recognition across construction and facility management industries.

What subjects and formats constitute the official examination?

The qualification requires passing two successive exams: 1) Written Examination (1차 필기시험: 80 multiple-choice CBT questions across 4 subjects in 120 minutes, requiring ≥40 points per subject and ≥60 points overall average); 2) Practical Examination (2차 실기시험: 2.5-hour written descriptive and engineering design/calculation paper titled 'Fire Protection Electrical Facility Design and Construction Practice', requiring ≥60 out of 100 to earn the certificate).

What career appointments and statutory authorities does this license confer?

Under the Act on Installation and Management of Firefighting Systems and related safety statutes, holders are eligible for appointment as First-Class Fire Safety Managers (1급 소방안전관리자), Registered Fire Protection Supervisors (소방감리원), and Technical Managers for licensed Fire Protection Construction Companies (소방시설공사업체 기술인력). They are legally qualified to sign off on fire electrical construction designs, perform annual comprehensive inspections (종합정밀점검), and ensure compliance with NFTC/NFPC national codes.

How do NFPC and NFTC standards apply to the examination?

In December 2022, South Korea reorganized its National Fire Safety Standards (NFSC) into dual tiers: National Fire Safety Performance Standards (NFPC, 화재안전성능기준) enacted by ministerial administrative notice, and National Fire Safety Technical Standards (NFTC, 화재안전기술기준) approved by the National Fire Agency. The exam tests candidates on technical criteria codified in NFTC 201 (emergency lighting), NFTC 202 (emergency broadcast), NFTC 203 (automatic fire detection), and related electrical safety provisions.

Is this OpenExamPrep practice bank an official examination simulation?

No. This practice bank is an independent English-language multiple-choice study adaptation created by OpenExamPrep featuring official Korean statutory, technical, and engineering terminology in parentheses. While the official written test contains 80 questions (20 per subject), this practice bank offers 100 questions (25 per subject) to deliver exhaustive instructional coverage for bilingual engineers, overseas candidates, and domestic test-takers.