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100+ Free HKIE Professional Assessment — Chemical Discipline Practice Questions
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2026 Statistics
Key Facts: HKIE Professional Assessment — Chemical Discipline Exam
Portfolio+Essay
Assessment Format
HKIE PA Regulations
2 Hours
Written Essay Duration
HKIE PA Regulations
HK$ 3,100
Total Assessment Fee
HKIE Fee Schedule 2026
4 Areas
HKIE Competence Standard
HKIE Competence Standards
45 Mins
Interview Duration
HKIE Interview Standards
MHKIE
Target Qualification
HKIE Membership Regulations
This exam prep resource provides 100 multiple-choice questions designed as an English-language study adaptation for chemical reaction engineering, unit operations, process control, safety & risk assessment (HAZOP), HK Dangerous Goods Ordinance (Cap. 295), HK EPD waste regulations, and HKIE ethics. It serves as a technical knowledge self-assessment tool and does not replace the official HKIE competence portfolio review, interview, or technical essay.
Sample HKIE Professional Assessment — Chemical Discipline Practice Questions
Try these sample questions to test your HKIE Professional Assessment — Chemical Discipline exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Water at 20°C (density ρ = 1000 kg/m³) flows through a smooth horizontal pipe of internal diameter D = 0.1 m at a volumetric flow rate of Q = 0.0314 m³/s. What is the average fluid velocity in the pipe?
A.2.0 m/s
B.4.0 m/s
C.6.0 m/s
D.8.0 m/s
Explanation: Cross-sectional area A = (π/4) × D² = 0.7854 × (0.1)² = 0.007854 m². The average velocity v = Q / A = 0.0314 / 0.007854 = 4.0 m/s. This calculation applies the continuity equation for incompressible fluid flow in closed conduits.
2A centrifugal pump transports liquid with a density of 1200 kg/m³ against a total dynamic head of H = 30 meters. Assuming local gravitational acceleration g = 9.81 m/s² and a pump hydraulic efficiency η = 75%, what is the electrical shaft power required for a volumetric flow rate Q = 0.05 m³/s?
A.14.7 kW
B.17.7 kW
C.23.5 kW
D.31.4 kW
Explanation: Hydraulic power P_hyd = ρ × g × Q × H = 1200 × 9.81 × 0.05 × 30 = 17,658 W = 17.66 kW. Required shaft power P_shaft = P_hyd / η = 17.66 kW / 0.75 = 23.55 kW (or ~23.5 kW). This demonstrates fundamental pump power sizing in process hydraulics.
3For fluid flow in a circular pipe, at what threshold value of Reynolds Number (Re = ρ v D / μ) does the transition from stable laminar flow to turbulent flow typically commence in industrial piping design?
A.Re = 500
B.Re = 2,100
C.Re = 10,000
D.Re = 100,000
Explanation: In pipe flow, laminar flow occurs for Re < 2,100 (or ~2,300), while fully developed turbulent flow generally occurs for Re > 4,000. The regime between 2,100 and 4,000 is considered the critical transition zone where flow becomes unstable.
4According to the Darcy-Weisbach equation h_f = f × (L/D) × (v² / 2g), if the fluid velocity v in a pipe is doubled while keeping pipe diameter D, length L, and friction factor f constant, how does the head loss h_f change?
A.Head loss remains unchanged
B.Head loss doubles (2x)
C.Head loss increases by a factor of 4 (4x)
D.Head loss increases by a factor of 8 (8x)
Explanation: Frictional head loss h_f is directly proportional to the square of fluid velocity (v²). Doubling the velocity (v → 2v) increases (2v)² = 4v², causing head loss to increase by a factor of 4. This quadratic relationship is fundamental to piping pressure drop evaluations.
5An ideal gas expands reversibly and isothermally at temperature T = 300 K from an initial volume V₁ = 1.0 m³ to a final volume V₂ = 2.0 m³. If n = 100 moles of gas are present and R = 8.314 J/(mol·K), what is the heat Q added to the gas during expansion?
A.172.9 kJ
B.249.4 kJ
C.345.8 kJ
D.576.2 kJ
Explanation: For an isothermal expansion of an ideal gas, ΔU = 0, so heat added Q = work done W = n R T ln(V₂ / V₁). Q = 100 mol × 8.314 J/(mol·K) × 300 K × ln(2.0 / 1.0) = 249,420 × 0.6931 = 172,885 J = 172.9 kJ. This demonstrates basic thermodynamic cycle calculations.
6In chemical thermodynamics, what criterion defines phase equilibrium for a multi-component, multi-phase closed system at constant temperature and pressure?
A.Equal mole fractions of each component in all phases
B.Equal chemical potential (μ_i^α = μ_i^β) for each species i across all phases α and β
C.Equal enthalpy of vaporization between liquid and vapor phases
D.Zero total entropy for the system and surroundings
Explanation: Phase equilibrium requires that the chemical potential (μ_i) of every component i is uniform across all existing phases (μ_i^α = μ_i^β = ... = μ_i^π). Equivalently, the fugacity of component i in phase α equals its fugacity in phase β (f_i^α = f_i^β).
7What thermodynamic state function is minimized when a system containing chemical reactions reaches chemical equilibrium at constant temperature and constant pressure?
A.Helmholtz Free Energy (A)
B.Gibbs Free Energy (G)
C.Internal Energy (U)
D.Enthalpy (H)
Explanation: At constant temperature and pressure, the criterion for spontaneous process direction and chemical equilibrium is the minimization of Gibbs Free Energy (G = H - TS). At equilibrium, (dG)_T,P = 0 and G is at a minimum.
8A gas stream at 5.0 bar absolute pressure flows into a venturi meter. If the throat velocity increases such that dynamic pressure increases by 50 kPa, assuming incompressible inviscid flow (density ρ = 1.2 kg/m³), what is the static pressure reduction at the throat?
A.25 kPa
B.50 kPa
C.100 kPa
D.250 kPa
Explanation: According to Bernoulli's equation for horizontal inviscid flow, P₁ + 0.5 ρ v₁² = P₂ + 0.5 ρ v₂², which simplifies to P₁ - P₂ = 0.5 ρ (v₂² - v₁²). An increase in dynamic pressure of 50 kPa corresponds directly to an identical static pressure drop of 50 kPa.
9What phenomenon occurs when the suction pressure at a pump impeller inlet drops below the vapor pressure of the liquid being pumped, causing vapor bubbles to form and violently collapse?
A.Water hammer
B.Cavitation
C.Choked flow
D.Vortex shedding
Explanation: Cavitation occurs when local static pressure drops below the liquid saturation vapor pressure (NPSHa < NPSHr), forming micro-vapor bubbles. As these bubbles move to higher pressure regions on the impeller blades, they collapse violently, causing severe pitting erosion, noise, and vibration.
10A liquid mixture follows Raoult's Law (P_i = x_i × P_i^sat). At 80°C, pure Benzene has a vapor pressure of 100 kPa and pure Toluene has a vapor pressure of 40 kPa. What is the total vapor pressure of an equimolar liquid mixture (x_benzene = 0.5, x_toluene = 0.5) at 80°C?
A.50 kPa
B.70 kPa
C.80 kPa
D.140 kPa
Explanation: P_total = P_benzene + P_toluene = (x_B × P_B^sat) + (x_T × P_T^sat) = (0.5 × 100 kPa) + (0.5 × 40 kPa) = 50 kPa + 20 kPa = 70 kPa. This demonstrates ideal solution thermodynamics and vapor pressure calculations.
About the HKIE Professional Assessment — Chemical Discipline Practice Questions
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