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ArticleIs City & Guilds 2079-11 Still Valid in 2026?12 min read
Exam Review

Key Facts: C&G 2079-11 F-Gas Category I Exam

40

Online Questions

City & Guilds 2079-101 specification

80 min

Online Test Time

City & Guilds 2079-101 specification

24/40

Pass Mark (Online Test)

City & Guilds 2079 handbook v2.5

31 Dec 2027

Last Registration

City & Guilds

31 Dec 2030

Last Certification

City & Guilds

£86.40

Published Qualification Fee

City & Guilds

City & Guilds 2079-11 remains an active Category I route in 2026, with last registration on 31 December 2027 and last certification on 31 December 2030. Assessment is a 40-question, 80-minute online test, passed at 24 marks or more out of 40, plus a practical assignment. Legal recognition differs across Great Britain, Northern Ireland, and the EU, and personal qualification does not replace company certification where required.

Sample C&G 2079-11 F-Gas Category I Practice Questions

Try these sample questions to review concepts for the C&G 2079-11 F-Gas Category I exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 112+ 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 C&G 2079-11 F-Gas Category I Exam

The City & Guilds 2079 Level 2 Award in F-Gas & ODS Regulations (Category I, qualification number 2079-11) is one of the accredited qualifications technicians in Great Britain can hold to legally handle fluorinated gases on stationary refrigeration, air-conditioning and heat-pump equipment. Category I covers all activities (leak checking, recovery, installation, repair, maintenance or servicing, and decommissioning) on systems of any charge size. Assessment is a 40-question online multiple-choice test (pass at 24 marks or more out of 40) plus a practical assessment.

Exam sponsor: City & Guilds (delivered through approved training centres). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

40 online (e-volve) multiple-choice questions over 80 minutes, closed book, plus a practical assessment, graded Pass/Fail; the theory test is passed at 24 marks or more out of 40 (60%).

Time Limit

80 minutes (multiple-choice paper)

Passing Score

Pass/Fail; pass at 24 marks or more out of 40 on the 2079-101 test, plus a pass in the practical assessment

Exam / Certification Fees

£86.40 typical City & Guilds qualification fee plus approved-centre charges

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

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.

11 of 40 questions

Systems, Thermodynamics, and Refrigerants

Official City & Guilds 2079-101 outcome group.

8 of 40 questions

Climate Change and Global Warming

Official City & Guilds 2079-101 outcome group.

2 of 40 questions

Ozone Depletion

Official City & Guilds 2079-101 outcome group.

14 of 40 questions

System Components and Leakage Risks

Official City & Guilds 2079-101 outcome group.

5 of 40 questions

Hazards and Safe Working

Official City & Guilds 2079-101 outcome group.

Preparing for the C&G 2079-11 F-Gas Category I Exam

What You Need to Know

  • Passing score: Pass/Fail; pass at 24 marks or more out of 40 on the 2079-101 test, plus a pass in the practical assessment
  • Assessment: 40 online (e-volve) multiple-choice questions over 80 minutes, closed book, plus a practical assessment, graded Pass/Fail; the theory test is passed at 24 marks or more out of 40 (60%).
  • Time limit: 80 minutes (multiple-choice paper)
  • Exam / certification fees: £86.40 typical City & Guilds qualification fee plus approved-centre charges Official sources

Using Our Practice Resources

  • Work through all 112 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

C&G 2079-11 F-Gas Category I: Suggested Study Strategy

1Be fluent with the four components and the cycle: compressor, condenser, expansion device, evaporator, and what happens to pressure, temperature and enthalpy at each stage
2Know the CO2-equivalent leak-check bands cold: 5 t = 12-monthly, 50 t = 6-monthly, 500 t = 3-monthly, with a fixed leak detector doubling each interval
3Remember CO2 equivalent = refrigerant mass (tonnes) x GWP, and that GWP measures climate impact while ODP measures ozone damage
4Distinguish recovery, recycling and reclamation, and remember that intentionally releasing F-gases is banned where it is not technically necessary and portable detectors must sense 5 g/year
5Learn the key refrigerant facts: CFCs/HCFCs have ODP, HFCs have zero ODP but high GWP, and since 1 January 2020 virgin F-gas with a GWP of 2,500 or more (such as R-404A, GWP 3,922) may not be used to service refrigeration equipment of 40 t CO2e or more
6Complete all 112 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the C&G 2079-11 F-Gas Category I exam and how long is it?

The theory assessment is 40 on-screen multiple-choice questions to be answered within 80 minutes as a closed-book exam. You also complete a separate practical assessment. The qualification is graded Pass/Fail.

What score do I need to pass the F-Gas Category I exam?

You need 60% on the multiple-choice paper, which is 24 correct answers out of 40, and you must also pass the practical assessment. Both elements must be achieved to gain the Category I certificate.

What does F-Gas Category I (2079-11) allow me to do?

Category I is the most comprehensive tier. It legally permits leak checking, refrigerant recovery, installation, repair, maintenance or servicing, and decommissioning on stationary refrigeration, air-conditioning and heat-pump systems of any refrigerant charge size.

What topics does the F-Gas Category I exam cover?

It covers the refrigeration cycle and p-h diagrams, refrigerants and the GB F-Gas and ODS Regulations, system components, leak detection and repair, recovery/recycling/reclamation, environmental impact (GWP and ODP) and safety legislation.

Do I need prior qualifications to take C&G 2079 Category I?

City & Guilds lists no eligibility requirements. Its handbook says the qualification is designed for experienced workers and is not entry level: an existing qualification or significant equivalent experience in the sector is desirable, and learners must be aged 16 or above.

Is this free F-Gas Category I practice as good as paid prep?

Our 112 practice questions are independent practice by OpenExamPrep on the topics in the City & Guilds 2079-101 test specification, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free and updated for 2026.