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119+ Free F-Gas Category II (IE) Practice Questions

QQI Level 5 Special Purpose Certificate in F-gas Handling in Small RACHPT&T Systems Category II practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: F-Gas Category II (IE) Exam

< 3 kg

Category II Charge Limit

EPA Ireland

< 6 kg

Hermetically Sealed Limit

EPA Ireland

100 hours

Programme Learning Hours

QQI

NFQ Level 5

Award Level (10 Credits)

QQI

5 g/year

Detector Sensitivity Required

EU 517/2014

100

Free Practice Questions

OpenExamPrep

The QQI Level 5 Special Purpose Certificate in F-gas Handling in Small RACHPT&T Systems Category II is Ireland's F-gas personnel qualification for small stationary refrigeration, air-conditioning, heat-pump and refrigerated truck/trailer equipment. Category II allows recovery, installation, servicing, repair and decommissioning only on systems with less than 3 kg of F-gas charge, or less than 6 kg if hermetically sealed, and non-intrusive leak checking without breaking into the circuit. The award requires 100 learning hours and a skills demonstration meeting Commission Implementing Regulation (EU) 2015/2067 Annex 1 Category II, validated by QQI. The EPA is Ireland's competent authority; company contractors need F-gas Registration Ltd certification. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample F-Gas Category II (IE) Practice Questions

Try these sample questions to test your F-Gas Category II (IE) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 119+ question experience with AI tutoring.

1In a basic vapour-compression refrigeration cycle, which component absorbs heat from the space or product being cooled?
A.The condenser
B.The compressor
C.The evaporator
D.The expansion valve
Explanation: The evaporator is where low-pressure liquid refrigerant boils (evaporates), absorbing latent heat from the surrounding air or product and producing the cooling effect. The other three components either reject heat, raise pressure, or reduce pressure.
2Which of the four main refrigeration components raises the pressure and temperature of the refrigerant vapour?
A.The evaporator
B.The compressor
C.The condenser
D.The receiver
Explanation: The compressor draws in low-pressure superheated vapour from the evaporator and compresses it, raising both its pressure and temperature so that it can subsequently reject heat in the condenser. It is the only component that adds work to the system.
3What happens to the refrigerant as it passes through the expansion (throttling) device?
A.Its pressure and temperature both fall
B.Its pressure rises and temperature falls
C.Its pressure and temperature both rise
D.Its enthalpy increases sharply
Explanation: The expansion valve or capillary tube throttles high-pressure liquid to low pressure. Both pressure and temperature drop, and a small fraction of the liquid flash-evaporates. The process is essentially constant-enthalpy (isenthalpic), shown as a vertical line on the p-h diagram.
4On a pressure-enthalpy (p-h) diagram, the throttling process through the expansion valve is represented by which type of line?
A.A horizontal line of constant pressure
B.A vertical line of constant enthalpy
C.A curved line following the saturation dome
D.A diagonal line of constant entropy
Explanation: Throttling is an isenthalpic process: enthalpy is constant, so it appears as a vertical line on the p-h diagram (enthalpy on the horizontal axis, pressure on the vertical axis). Pressure drops while enthalpy stays the same.
5What is meant by 'superheat' in a refrigeration system?
A.The temperature of the refrigerant above its saturation temperature in the vapour state
B.The temperature of the liquid below its saturation temperature
C.The pressure rise across the compressor
D.The latent heat absorbed in the evaporator
Explanation: Superheat is the number of degrees the refrigerant vapour is heated above its saturation (boiling) temperature at the prevailing pressure. Adequate superheat at the compressor suction protects the compressor from liquid floodback (liquid slugging).
6What does 'sub-cooling' describe in the refrigeration cycle?
A.Cooling the vapour leaving the compressor
B.Cooling the liquid refrigerant below its saturation temperature
C.Heating the vapour above its saturation temperature
D.Reducing the suction pressure
Explanation: Sub-cooling is cooling the liquid refrigerant leaving the condenser to below its saturation temperature for the prevailing pressure. It ensures only liquid (not flash gas) enters the expansion device, improving capacity and efficiency.
7In the evaporator, refrigerant absorbs heat mainly by which mechanism?
A.Sensible heating of the vapour
B.Latent heat of vaporisation as the liquid boils
C.Heat of compression
D.Conduction through the receiver
Explanation: Inside the evaporator the low-pressure liquid refrigerant boils, absorbing latent heat of vaporisation from the air or product. Because a phase change absorbs a large amount of energy at constant temperature, this is what gives the system its cooling capacity.
8Which statement about the condenser in a vapour-compression system is correct?
A.It boils the refrigerant at low pressure
B.It rejects heat and condenses the high-pressure vapour to liquid
C.It reduces the refrigerant pressure
D.It compresses the refrigerant vapour
Explanation: The condenser receives hot, high-pressure superheated vapour from the compressor, de-superheats it, then condenses it to liquid by rejecting heat to the ambient air or water. The total heat rejected equals the cooling load plus the compressor work.
9On a p-h diagram, the area inside the curved 'saturation dome' represents refrigerant that is in which state?
A.Sub-cooled liquid only
B.Superheated vapour only
C.A mixture of liquid and vapour (two-phase)
D.Supercritical fluid
Explanation: The region under the saturation dome is the two-phase region, where liquid and vapour coexist. To the left of the dome the refrigerant is sub-cooled liquid; to the right it is superheated vapour. Evaporation and condensation both take place inside the dome at constant pressure.
10Why must liquid refrigerant be prevented from returning to the compressor suction?
A.Liquid is incompressible and can cause mechanical damage (liquid slugging)
B.Liquid lowers the system GWP
C.Liquid increases superheat
D.Liquid improves lubrication
Explanation: Liquid refrigerant is effectively incompressible, so if it reaches the compressor cylinders it can cause hydraulic shock or 'liquid slugging', damaging valves and bearings. Maintaining adequate suction superheat ensures only vapour enters the compressor.

About the F-Gas Category II (IE) Practice Questions

Verified exam format metadata for QQI Level 5 Special Purpose Certificate in F-gas Handling in Small RACHPT&T Systems Category II is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.