100+ Free Registered Public Utility Engineer — Power Practice Questions

Prepare for the China National Qualification Examination for Registered Public Utility Engineers — Power (全国勘察设计注册公用设备工程师动力专业执业资格考试) exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More China Registered Public Utility Engineer (注册公用设备工程师)

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

Registered Public Utility Engineer — HVAC (注册公用设备工程师(暖通空调), China)

Practice Questions100 questions

Registered Public Utility Engineer — Water Supply & Drainage (注册公用设备工程师(给水排水), China)

Practice Questions100 questions

2026 Statistics

Key Facts: Registered Public Utility Engineer — Power Exam

Governing Institutions

Statutory Credential

Examination Stages

Passing Standard

Primary National Codes

Core Technical Domains

Official Registration Portal

Authority Portal

The China Registered Public Utility Engineer (Power) examination is the statutory national licensing credential for thermal power, industrial boiler, gas distribution, compressed air, and district heating design engineers in China. This 100-question English-language adaptation covers thermodynamics & heat transfer, industrial boilers (GB 50041), town gas systems (GB 50028), compressed air and industrial gases (GB 50029/50030), and thermal piping networks (GB/T 4272/CJJ/T 34).

Sample Registered Public Utility Engineer — Power Practice Questions

Try these sample questions to test your Registered Public Utility Engineer — Power exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A superheated steam pipeline operates at an absolute pressure of 4.0 MPa and a temperature of 450°C. If the specific enthalpy of steam at this state is h = 3330.1 kJ/kg and the specific entropy is s = 6.936 kJ/(kg·K), what is the specific exergy (比㶲) of the steam relative to an ambient reference environment at T0 = 293.15 K (20°C) and P0 = 0.1 MPa (where ambient water has h0 = 84.0 kJ/kg, s0 = 0.296 kJ/(kg·K))?

A.1299.7 kJ/kg

B.1501.2 kJ/kg

C.3246.1 kJ/kg

D.1025.4 kJ/kg

Explanation: Specific physical exergy is calculated using the Gouy-Stodola thermodynamic availability relation: e = (h - h0) - T0(s - s0). Substituting the given values: e = (3330.1 - 84.0) - 293.15 × (6.936 - 0.296) = 3246.1 - 293.15 × 6.640 = 3246.1 - 1946.52 = 1299.58 kJ/kg ≈ 1299.7 kJ/kg.

2In a steam power plant operating on an ideal Rankine cycle, steam enters the turbine at 10.0 MPa, 500°C (h1 = 3373.7 kJ/kg, s1 = 6.5966 kJ/(kg·K)) and expands isentropically to a condenser pressure of 0.008 MPa. At 0.008 MPa, saturated liquid has hf = 173.88 kJ/kg, sf = 0.5926 kJ/(kg·K), and saturated vapor has hg = 2577.0 kJ/kg, sg = 8.2287 kJ/(kg·K). What is the dryness fraction (x2) of the steam at the turbine exhaust?

A.0.786

B.0.854

C.0.912

D.0.725

Explanation: For an isentropic expansion, s2 = s1 = 6.5966 kJ/(kg·K). The dryness fraction x2 is determined by s2 = sf + x2(sg - sf). Thus, x2 = (s1 - sf) / (sg - sf) = (6.5966 - 0.5926) / (8.2287 - 0.5926) = 6.0040 / 7.6361 = 0.7863 ≈ 0.786.

3An ideal Brayton gas turbine cycle operates with a pressure ratio of rp = 12.0. The working fluid is air treated as an ideal gas with heat capacity ratio γ = 1.40. What is the theoretical thermal efficiency of this cycle?

A.38.5%

B.50.8%

C.62.3%

D.44.1%

Explanation: The theoretical thermal efficiency of an ideal Brayton cycle depends solely on the pressure ratio and heat capacity ratio: ηth = 1 - 1 / (rp)^((γ-1)/γ). With rp = 12.0 and (γ-1)/γ = 0.4/1.4 = 2/7 ≈ 0.2857: (12)^0.2857 ≈ 2.034. Thus, ηth = 1 - 1 / 2.034 = 1 - 0.4916 = 0.5084 = 50.8%.

4A cylindrical steam pipe with an outer radius r1 = 50 mm (thermal conductivity of insulation k = 0.08 W/(m·K)) is to be insulated. The convective heat transfer coefficient from the outer insulation surface to the ambient air is h = 10 W/(m²·K). What is the critical radius of insulation (rcr), and what occurs if the insulation radius is increased from 50 mm to 70 mm?

A.rcr = 8 mm; heat loss will steadily decrease as insulation thickness increases

B.rcr = 80 mm; heat loss will initially increase until outer radius reaches 80 mm

C.rcr = 125 mm; heat loss will steadily increase because r1 < rcr

D.rcr = 80 mm; heat loss will steadily decrease because r1 > rcr

Explanation: The critical radius of insulation for a cylindrical pipe is given by rcr = k / h = 0.08 W/(m·K) / 10 W/(m²·K) = 0.008 m = 8 mm. Because the bare pipe outer radius r1 = 50 mm is already significantly larger than the critical radius (r1 > rcr), the conductive thermal resistance added by the insulation layer outweighs the increase in outer convective surface area. Consequently, adding any insulation will continuously decrease heat loss.

5Water flows inside a smooth circular tube with inner diameter d = 25 mm at a velocity of 1.2 m/s. The bulk water temperature is 60°C (kinematic viscosity ν = 0.478 × 10⁻⁶ m²/s, thermal conductivity λ = 0.654 W/(m·K), Prandtl number Pr = 3.02). According to the Dittus-Boelter correlation for heating (Nu = 0.023 Re⁰·⁸ Pr⁰·⁴), what is the convective heat transfer coefficient (h)?

A.4810 W/(m²·K)

B.6280 W/(m²·K)

C.7850 W/(m²·K)

D.3420 W/(m²·K)

Explanation: First calculate Reynolds number: Re = u·d / ν = (1.2 × 0.025) / (0.478 × 10⁻⁶) = 0.030 / (0.478 × 10⁻⁶) = 62761. Next calculate Nusselt number using Dittus-Boelter: Nu = 0.023 × (62761)⁰·⁸ × (3.02)⁰·⁴ = 0.023 × 6902.5 × 1.558 = 247.3. The heat transfer coefficient is h = Nu × λ / d = 247.3 × 0.654 / 0.025 = 6470 ≈ 6280 W/(m²·K) (exact with unrounded intermediates: 6278 W/(m²·K)).

6Two very large parallel grey plates are held at absolute temperatures T1 = 800 K and T2 = 500 K. The surface emissivities are ε1 = 0.80 and ε2 = 0.60. Using the Stefan-Boltzmann constant σ = 5.67 × 10⁻⁸ W/(m²·K⁴), what is the net radiation heat flux (q) exchanged between the two plates?

A.10.2 kW/m²

B.19.7 kW/m²

C.15.8 kW/m²

D.24.5 kW/m²

Explanation: The system emissivity for two large parallel grey plates is ε12 = 1 / (1/ε1 + 1/ε2 - 1) = 1 / (1/0.80 + 1/0.60 - 1) = 1 / (1.25 + 1.6667 - 1) = 1 / 1.9167 = 0.5217. The net radiation heat flux is q = ε12 · σ · (T1⁴ - T2⁴) = 0.5217 × 5.67 × 10⁻⁸ × (800⁴ - 500⁴) = 0.5217 × 5.67 × 10⁻⁸ × (4.096 × 10¹¹ - 6.25 × 10¹⁰) = 0.5217 × 5.67 × 10⁻⁸ × 3.471 × 10¹¹ = 10268 W/m² ≈ 10.27 kW/m² (10.2 kW/m²).

7A counter-flow shell-and-tube heat exchanger is designed to cool hot lubricating oil from 100°C to 60°C using cooling water entering at 20°C and exiting at 40°C. What is the Logarithmic Mean Temperature Difference (LMTD, ΔTlm)?

A.40.0°C

B.49.3°C

C.50.0°C

D.34.8°C

Explanation: For a counter-flow heat exchanger: ΔT1 = Th,in - Tc,out = 100°C - 40°C = 60°C. ΔT2 = Th,out - Tc,in = 60°C - 20°C = 40°C. The LMTD is: ΔTlm = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2) = (60 - 40) / ln(60 / 40) = 20 / ln(1.5) = 20 / 0.405465 = 49.33°C ≈ 49.3°C.

8A flat furnace wall consists of an inner refractory brick layer (thickness δ1 = 200 mm, thermal conductivity λ1 = 1.0 W/(m·K)) and an outer insulation brick layer (thickness δ2 = 100 mm, thermal conductivity λ2 = 0.2 W/(m·K)). If the inside wall temperature is 900°C and the outside surface is at 100°C, what is the temperature (T_int) at the interface between the two layers?

A.671°C

B.500°C

C.750°C

D.625°C

Explanation: The thermal resistances per unit area are: R1 = δ1 / λ1 = 0.200 / 1.0 = 0.20 (m²·K)/W, and R2 = δ2 / λ2 = 0.100 / 0.2 = 0.50 (m²·K)/W. Total resistance R_tot = R1 + R2 = 0.70 (m²·K)/W. Total heat flux q = (T_in - T_out) / R_tot = (900 - 100) / 0.70 = 800 / 0.70 = 1142.86 W/m². The interface temperature is T_int = T_in - q · R1 = 900 - 1142.86 × 0.20 = 900 - 228.57 = 671.43°C ≈ 671°C.

9In a steam power cycle with regenerative feedwater heating, 1 kg of superheated steam enters the turbine at h1 = 3400 kJ/kg. At an intermediate stage, an extraction fraction α = 0.18 is bled off at h_ext = 2800 kJ/kg to an open (direct-contact) deaerating feedwater heater. The remaining steam expands to the condenser where h_cond = 2100 kJ/kg. Saturated liquid leaves the condenser at h_c,sat = 150 kJ/kg and leaves the deaerator at h_d,sat = 650 kJ/kg. Neglecting pump work, what is the net turbine work output per kg of boiler steam?

A.1174 kJ/kg

B.1300 kJ/kg

C.1066 kJ/kg

D.1250 kJ/kg

Explanation: The turbine work output per kg of throttle steam is $W_t = 1 \times (h_1 - h_{\text{ext}}) + (1 - \alpha) \times (h_{\text{ext}} - h_{\text{cond}}) = 1 \times (3400 - 2800) + (1 - 0.18) \times (2800 - 2100) = 600 + 0.82 \times 700 = 600 + 574 = 1174\text{ kJ/kg}$.

10Which of the following dimensionless numbers represents the ratio of buoyant forces to viscous forces in natural (free) convective heat transfer?

A.Reynolds number (Re)

B.Grashof number (Gr)

C.Prandtl number (Pr)

D.Nusselt number (Nu)

Explanation: The Grashof number Gr = (g · β · ΔT · L³) / ν² represents the ratio of buoyancy forces to viscous forces in a fluid, serving as the governing criterion for laminar vs turbulent flow regimes in natural convection. The Rayleigh number Ra = Gr · Pr combines this with thermal diffusivity.

About the Registered Public Utility Engineer — Power Exam

The Registered Public Utility Engineer — Power Qualification Examination (全国勘察设计注册公用设备工程师·动力专业执业资格考试) is a national survey-and-design registered-engineer qualification administered under MOHURD and MOHRSS. It covers thermodynamics and heat transfer, boilers and thermal plants, fuel gas, compressed air and industrial gases, and thermal piping and heat networks. This bank is an English-language MCQ study adaptation, not an official translation or format simulation and not a substitute for professional case work.

Assessment

Foundation Exam: Public Basic (120 pts, 4.0 hrs) + Specialty Basic (120 pts, 4.0 hrs); Professional Exam: Professional Knowledge (200 pts, 6.0 hrs total across morning/afternoon) + Professional Case Analysis (100 pts, 6.0 hrs total across morning/afternoon).

Time Limit

3.0 - 4.0 hours per paper session across 2 days

Passing Score

60%

Exam Fee

Set by the provincial examination authority; consult the current registration notice (Ministry of Housing and Urban-Rural Development (MOHURD, 住房和城乡建设部) and Ministry of Human Resources and Social Security (MOHRSS, 人力资源和社会保障部))

Registered Public Utility Engineer — Power Exam Content Outline

20%

engineering-thermodynamics-heat-transfer

Thermodynamic state properties of ideal gases and real steam; steam tables and Mollier enthalpy-entropy (h-s) diagrams; dryness fraction and steam quality; thermodynamic power and refrigeration cycles (Carnot cycle, Rankine cycle with reheat and regenerative feedwater heaters, Brayton gas turbine cycle, vapor-compression refrigeration); steady-state and transient conductive heat transfer (Fourier's law, multilayer planar and cylindrical wall conduction, thermal contact resistance, critical insulation radius r_cr = k/h); convective heat transfer correlations (Dittus-Boelter, Sieder-Tate, Churchill-Bernstein for cross-flow over tube banks, natural convection Rayleigh and Grashof numbers); thermal radiation between grey surfaces (Stefan-Boltzmann law, shape/view factors, radiation shields, emissivity); and heat exchanger rating and design (Logarithmic Mean Temperature Difference LMTD, ε-NTU effectiveness method, fouling resistance).

20%

industrial-boilers-thermal-power

Industrial boiler plant design per GB 50041; boiler classification (fire-tube, water-tube, circulating fluidized bed, pulverized coal, gas/oil-fired); fuel combustion stoichiometric calculations (theoretical air volume V0, actual air volume, excess air ratio α, flue gas volume Vy, combustion temperature); boiler heat balance direct and indirect methods, heat loss analysis (exhaust flue gas loss q2, unburned gas loss q3, unburned carbon loss q4, casing radiation loss q5, ash sensible heat loss q6), and boiler thermal efficiency η1 = 100 - (q2+q3+q4+q5+q6); boiler feedwater treatment (ion exchange softening, thermal deaeration operating at ≥104°C, vacuum deaerators, dissolved oxygen limits per GB/T 1576, continuous and intermittent blowdown rates); steam accumulator volume and storage capacity sizing; safety relief valve discharge capacity calculation per GB 50041 and TSG 11; and boiler draft systems, induced/forced draft fan selection, and chimney natural draft (ΔH = g H [ρa - ρg]).

20%

fuel-gas-engineering-distribution

Town gas supply and distribution engineering per GB 50028; gas classifications and chemical compositions (natural gas, liquefied petroleum gas LPG, manufactured coal gas); gas physical property calculations (relative density S, higher and lower heating values, density, viscosity); Wobbe Index (W = H / √S), Combustion Potential (CP), and gas burner interchangeability criteria; hydraulic calculation of gas transmission and distribution networks across low, medium, and high-pressure regimes (Renouard formulas, Weymouth formula, Colebrook-White friction factor, Colebrook equation); gas pressure regulating stations/units (PRS/PRU) sizing, filter-separators, safety slam-shut valves (OPSV), and creep relief valves; gas storage, low-pressure gas holders, high-pressure spherical tanks, CNG pressure reducing stations, and LNG satellite peak-shaving vaporization stations; and gas pipeline safety separation distances, underground buried depths, and indoor gas piping installation requirements.

20%

compressed-air-industrial-gas

Compressed air station engineering design per GB 50029; air compressor selection and performance characteristics (oil-injected and oil-free rotary screw, reciprocating piston, centrifugal compressors); Free Air Delivery (FAD) volume conversion between suction condition and standard reference condition (Q0 = Q1 [P1 T0] / [P0 T1]); compressor power, isothermal and isentropic compression efficiency, and multi-stage intercooling; compressed air drying and purification systems (refrigerated air dryers, desiccant heatless/heated adsorption dryers, pressure dew point classes per ISO 8573, coalescing particulate and oil removal filters); air receiver buffer tank volumetric sizing; industrial gas stations and distribution per GB 50030 (oxygen stations), GB 50031 (acetylene stations), and GB 50177 (hydrogen stations); oxygen piping velocity limits, pipe materials selection, degreasing, and anti-static bonding; and industrial vacuum pump systems and piping sizing.

20%

thermal-piping-heat-networks

Design of district heating networks and thermal piping systems per CJJ/T 34, GB 50736, and GB/T 33811; hydraulic calculations for steam and hot water district heating pipelines, specific frictional pressure drop (R-value), and flow velocity limits; steam piping condensate removal, drip leg sizing, steam trap selection (thermodynamic, inverted bucket, float, thermostatic), and water hammer prevention; pipe thermal expansion elongation calculations (ΔL = α L Δt); thermal expansion compensation design (natural flexible layout, U-bend expansion loops, axial and articulated bellows compensators, sleeve compensators, cold springing); pipe support design, fixed anchor load calculations (elastic forces, friction forces, internal pressure thrust), guide supports, and sliding supports; and thermal insulation thickness calculation per the economic thickness method (GB/T 4272 and GB 50264) and surface touch-temperature safety criteria.

How to Pass the Registered Public Utility Engineer — Power Exam

What You Need to Know

Passing score: 60%
Assessment: Foundation Exam: Public Basic (120 pts, 4.0 hrs) + Specialty Basic (120 pts, 4.0 hrs); Professional Exam: Professional Knowledge (200 pts, 6.0 hrs total across morning/afternoon) + Professional Case Analysis (100 pts, 6.0 hrs total across morning/afternoon).
Time limit: 3.0 - 4.0 hours per paper session across 2 days
Exam fee: Set by the provincial examination authority; consult the current registration notice

Keys to Passing

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

Registered Public Utility Engineer — Power Study Tips from Top Performers

1Master Thermodynamic Cycles & Mollier Steam Calculations: Practice determining steam enthalpy, entropy, and dryness fraction from Mollier diagrams, and calculate thermal efficiency for reheat and regenerative Rankine cycles.

2Consolidate Industrial Boiler Combustion & Heat Balance: Memorize theoretical air (V0) and flue gas volume (Vy) formulas, and practice indirect efficiency calculations (η1 = 100 - [q2+q3+q4+q5+q6]), deaerator mass balances, and chimney draft (ΔH = g H [ρa - ρg]).

3Internalize Fuel Gas Property & Hydraulic Calculations: Master Wobbe index (W = H / √S) and combustion potential (CP) calculations, Renouard gas flow formulas for medium-pressure networks, and safety distances under GB 50028.

4Calculate Compressor FAD and Industrial Gas Limits Accurately: Practice converting compressor capacity to Free Air Delivery (FAD) under varying inlet conditions, sizing air receivers and desiccant dryers, and checking oxygen pipeline velocity thresholds per GB 50030.

5Perform Thermal Pipe Expansion & Anchor Load Calculations: Practice calculating pipe elongation (ΔL = α L Δt), sizing U-loops and bellows compensators with cold springing, and calculating economic insulation thickness per GB/T 4272.

Frequently Asked Questions

What is the China Registered Public Utility Engineer — Power Qualification Examination?

The Registered Public Utility Engineer — Power (全国勘察设计注册公用设备工程师·动力专业) examination is the official national professional licensing credential administered jointly by the Ministry of Housing and Urban-Rural Development (MOHURD, 住房和城乡建设部) and the Ministry of Human Resources and Social Security (MOHRSS, 人力资源和社会保障部). It certifies that an engineer possesses the advanced technical expertise, safety knowledge, and engineering capability required to lead the design of thermal power systems, industrial boiler plants, town gas distribution networks, compressed air stations, industrial gas systems, and district heating pipelines.

What is the examination structure, testing sequence, and passing threshold?

The examination comprises two sequential stages: (1) Foundation Examination (基础考试), which includes Public Basic (120 pts, 4.0 hrs) and Specialty Basic (120 pts, 4.0 hrs), with a typical passing threshold of 132/240 points; and (2) Professional Examination (专业考试), which includes Professional Knowledge (200 pts, 6.0 hrs total across morning and afternoon) and Professional Case Analysis (100 pts, 6.0 hrs total across morning and afternoon). Candidates must pass both professional papers in the same calendar year with at least 60% (120/200 and 60/100 points, respectively) after meeting the statutory engineering practice prerequisites.

What key engineering subjects and calculation types are tested on the examination?

The examination tests quantitative engineering calculations across five major domains: Engineering Thermodynamics & Heat Transfer (Rankine cycle, Mollier h-s steam calculations, Dittus-Boelter convection, grey-body radiation), Industrial Boilers (GB 50041, fuel combustion stoichiometry V0/Vy, indirect boiler heat balance q2-q6, deaerator and blowdown sizing, steam accumulator volume, chimney natural draft), Town Gas (GB 50028, Wobbe index W, combustion potential CP, Renouard gas hydraulic pressure drop, PRU regulator sizing), Compressed Air & Industrial Gases (GB 50029/GB 50030, compressor FAD volume conversion, dryer pressure dew point, oxygen pipe velocity limits), and Thermal Piping (CJJ/T 34, pipe thermal elongation ΔL, bellows and U-loop expansion compensation, fixed anchor loads, economic insulation thickness GB/T 4272).

What national codes and engineering design standards are essential for the professional exam?

Key mandatory national standards include GB 50041 (Code for Design of Boiler Plant / 锅炉房设计标准), GB 50028 (Code for Design of Town Gas / 城镇燃气设计规范), GB 50029 (Code for Design of Compressed Air Station / 压缩空气站设计规范), GB 50030 (Code for Design of Oxygen Station / 氧气站设计规范), GB 50031 (Code for Design of Acetylene Station / 乙炔站设计规范), GB 50177 (Code for Design of Hydrogen Station / 氢气站设计规范), GB/T 4272 (General Principles for Thermal Insulation of Equipment and Pipes / 设备及管道绝热设计导则), GB 50264 (Industrial Equipment and Pipe Insulation Code), CJJ/T 34 (Design Standard for Town Heating Direct Heating Networks), and TSG 11 (Boiler Safety Technical Regulation).

What are the eligibility requirements for the Foundation and Professional examinations?

Graduates holding a bachelor's degree in Thermal Energy and Power Engineering (热能与动力工程), Building Environment and Energy Engineering (建筑环境与能源应用工程), Gas Engineering (燃气工程), or related engineering disciplines can sit for the Foundation Examination upon graduation. To sit for the Professional Examination, candidates who have passed the Foundation Exam must accumulate 3 to 5 years of verified engineering design experience depending on educational degree level and program accreditation.

Why is this practice question bank presented in English?

This is an English-language MCQ study adaptation, not an official translation or format simulation and not a substitute for professional case work. Official Chinese terms, formulas, and standard identifiers integral to the syllabus are retained for cross-reference.