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100+ Free HKIE Professional Assessment — Building Services Discipline Practice Questions
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2026 Statistics
Key Facts: HKIE Professional Assessment — Building Services Discipline Exam
4 Areas
HKIE Competence Standard
HKIE Competence Standards
2 Hours
Written Essay Duration
HKIE PA Guidelines
45 Mins
Interview Duration
HKIE PA Guidelines
The HKIE Professional Assessment in Building Services Discipline assesses 12 core competencies via portfolio submission, interview, and essay. This 100-question English MCQ practice bank serves as an interactive technical knowledge revision tool for HK statutory codes, electrical/HVAC math, and FSD/WSD/EMSD regulations to complement your official assessment preparation.
Sample HKIE Professional Assessment — Building Services Discipline Practice Questions
Try these sample questions to test your HKIE Professional Assessment — Building Services Discipline exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In psychrometric analysis of an air-conditioning system, how is the Sensible Heat Factor (SHF) defined?
A.The ratio of sensible cooling load to total cooling load (sensible load plus latent load)
B.The ratio of latent cooling load to sensible cooling load
C.The ratio of total cooling load to compressor electrical power input
D.The ratio of room moisture removal rate to total supply air volume
Explanation: Sensible Heat Factor (SHF) is defined as SHF = Q_sensible / (Q_sensible + Q_latent) = Q_sensible / Q_total. It represents the proportion of thermal cooling capacity dedicated to reducing dry-bulb temperature relative to the overall thermal load.
2At constant dry-bulb temperature, what happens to the wet-bulb temperature and relative humidity of air as water vapor is added during a humidification process?
A.Both wet-bulb temperature and relative humidity increase
B.Dry-bulb temperature increases while relative humidity decreases
C.Wet-bulb temperature decreases while relative humidity increases
D.Relative humidity increases while dew-point temperature decreases
Explanation: Adding moisture to air at constant dry-bulb temperature increases the vapor pressure, humidity ratio, and relative humidity. Because the total enthalpy of the air increases due to the latent heat of the added vapor, the wet-bulb temperature also increases.
3According to the Fan Laws, if the rotational speed (RPM) of a centrifugal fan in an AHU is increased by 10%, how does the air volume flow rate change?
A.Increases directly proportional to speed by 10%
B.Increases by the square of speed (21%)
C.Increases by the cube of speed (33.1%)
D.Remains constant while static pressure increases by 10%
Explanation: Fan Law 1 states that air volume flow rate (Q) is directly proportional to fan rotational speed (N), i.e., Q2/Q1 = N2/N1. Therefore, a 10% increase in fan speed yields a 10% increase in volumetric airflow.
4What is the primary operational consequence of specifying higher MERV-rated air filters (e.g., MERV 13 vs MERV 8) in a commercial Air Handling Unit (AHU)?
A.Higher initial and final air pressure drop across the filter, requiring higher fan static pressure
B.Lower air pressure drop across the filter and reduced fan motor power
C.Increased moisture removal capacity during winter heating mode
D.Reduction in indoor acoustic noise levels without affecting fan static pressure
Explanation: Higher MERV-rated filters feature finer media density to trap smaller airborne particles, which inherently creates greater resistance to airflow. This results in a higher initial and final pressure drop across the filter bank, requiring the AHU supply fan to operate against increased static pressure.
5In standard Hong Kong commercial HVAC chilled water system design, what is the typical design temperature differential (ΔT) across the chilled water supply and return headers?
A.5.5 °C to 7.0 °C (e.g., 7 °C supply / 12.5 °C to 14 °C return)
B.1.0 °C to 2.0 °C
C.15.0 °C to 20.0 °C
D.25.0 °C to 30.0 °C
Explanation: Standard HK building design practice uses a chilled water supply temperature of approximately 7 °C with return temperature of 12.5 °C to 14 °C, giving a temperature differential (ΔT) of 5.5 °C to 7.0 °C. High-ΔT designs (e.g., 7 °C to 10 °C ΔT) are increasingly used to reduce pumping power.
6Which line on a standard psychrometric chart represents a pure sensible cooling process without moisture condensation?
A.A horizontal line moving from right to left at constant humidity ratio
B.A vertical line moving downwards at constant dry-bulb temperature
C.A line sloping upwards along constant wet-bulb temperature
D.A curve following 100% relative humidity line
Explanation: Sensible cooling reduces the dry-bulb temperature while keeping the humidity ratio (moisture content) constant. On a standard psychrometric chart, this is represented by a horizontal line moving leftward toward lower dry-bulb temperatures.
7Per ISO 7730 and ASHRAE 55, what PMV (Predicted Mean Vote) range is specified for Class B (standard commercial office) thermal comfort compliance?
A.-0.5 < PMV < +0.5 (with PPD < 10%)
B.-2.0 < PMV < +2.0 (with PPD < 50%)
C.PMV must equal exactly 0.00 at all room locations
D.+1.0 < PMV < +3.0 (with PPD < 5%)
Explanation: Standard commercial building thermal comfort guidelines (ISO 7730 Category B / ASHRAE 55) require PMV to be maintained between -0.5 and +0.5, corresponding to a Predicted Percentage Dissatisfied (PPD) of less than 10%.
8What is the key functional difference between a Variable Air Volume (VAV) system and a Constant Air Volume (CAV) system in air conditioning?
A.VAV varies supply airflow rate at constant supply temperature to match zone loads, whereas CAV maintains constant airflow rate and varies supply temperature
B.VAV varies refrigerant pressure at the chiller while CAV varies fan motor frequency only
C.VAV supplies constant fresh air volume while CAV varies outdoor air percentage dynamically
D.VAV eliminates air filtration while CAV uses high-efficiency MERV filters
Explanation: VAV systems modulate the supply air volume delivered to individual thermal zones using damper-controlled terminal boxes while keeping supply air temperature relatively constant. CAV systems deliver a constant volumetric airflow rate and vary supply air temperature to maintain room comfort.
9An AHU supplies air at a volumetric flow rate of 2.5 m³/s to an open-plan office. The room design dry-bulb temperature is 24 °C and the supply air dry-bulb temperature is 14 °C. Assuming air density ρ = 1.2 kg/m³ and specific heat capacity cp = 1.005 kJ/kg·K, calculate the sensible cooling capacity delivered by the AHU.
A.30.15 kW
B.25.10 kW
C.35.40 kW
D.12.06 kW
Explanation: Sensible cooling capacity Q_s = ρ × Q × cp × ΔT. Here, ρ = 1.2 kg/m³, Q = 2.5 m³/s, cp = 1.005 kJ/kg·K, and ΔT = (24 - 14) = 10 K. Therefore, Q_s = 1.2 × 2.5 × 1.005 × 10 = 30.15 kW.
10An air-conditioning coil removes moisture from a primary outdoor air stream at a mass flow rate of 3.0 kg/s. The humidity ratio decreases from w1 = 0.020 kg_w/kg_da to w2 = 0.016 kg_w/kg_da. Taking the latent heat of vaporization h_fg = 2450 kJ/kg, what is the latent cooling load across the coil?
A.29.40 kW
B.14.70 kW
C.44.10 kW
D.58.80 kW
Explanation: Latent cooling load Q_l = mass flow rate × h_fg × Δw. Δw = 0.020 - 0.016 = 0.004 kg_w/kg_da. Mass flow rate = 3.0 kg/s. Thus, Q_l = 3.0 kg/s × 2450 kJ/kg × 0.004 = 29.40 kW.
About the HKIE Professional Assessment — Building Services Discipline Practice Questions
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