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Key Facts: gh-ctvet-cert-ii-refrigeration-ac Exam

100

Written Exam Questions

CTVET

2 hours

Time Limit

CTVET

EPA Ghana

Refrigerant Regulator

EPA Act

50%

Passing Mark

CTVET

80%

Max Recovery Fill

Safety standard

500 Microns

Target Vacuum Level

Best practice

The CTVET Certificate II Refrigeration & AC exam is the national standard for HVAC/R technicians in Ghana. It tests thermodynamic fundamentals, refrigeration cycle components, refrigerant handling rules, brazing techniques, and compressor circuits. The exam features 100 questions to be answered in 2 hours, with a 50% passing threshold, and is accompanied by a hands-on practical assessment.

Sample gh-ctvet-cert-ii-refrigeration-ac Practice Questions

Try these sample questions to review concepts for the gh-ctvet-cert-ii-refrigeration-ac exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which class of fire extinguisher is specifically designed and rated for extinguishing electrical fires in an HVAC/R workshop?
A.Class A
B.Class B
C.Class C
D.Class D
Explanation: Class C fire extinguishers are designed for electrical fires involving energized electrical equipment (often referred to as Class E in some international standards, but Class C under standard classification systems). They use non-conductive extinguishing agents like carbon dioxide (CO2) or dry chemical powders. Class A is for ordinary combustibles (wood, paper), Class B is for flammable liquids (oils, solvents), and Class D is for combustible metals.
2What is the primary personal protective equipment (PPE) required to protect your eyes when handling or charging liquid refrigerants?
A.Standard reading spectacles
B.Impact-resistant safety goggles or a full face shield
C.Polarized sunglasses
D.A welding hood with dark filter glass
Explanation: Impact-resistant safety goggles or a full face shield must be worn when working with liquid refrigerants to prevent accidental splashes from reaching the eyes. Contact with liquid refrigerant can cause immediate freezing of eye tissues, resulting in permanent blindness. Standard spectacles, sunglasses, and welding hoods do not provide adequate side seal protection against liquid spray.
3If a coworker is experiencing an electric shock in the refrigeration workshop, what is the very first action you should take?
A.Grab their arm and pull them away from the electrical source
B.Throw water on the coworker to extinguish any electrical sparks
C.Immediately switch off or isolate the main power source
D.Administer cardiopulmonary resuscitation (CPR) immediately before isolating power
Explanation: The first and most critical action is to safely switch off or isolate the main electrical power source to break the current path. Attempting to pull the victim away while they are still in contact with the live source will result in the rescuer also receiving the electric shock. Only after the current is safely disconnected should you assess the victim and administer first aid or CPR.
4On a standard HVAC/R service manifold gauge set, what is the function of the blue hose?
A.Connecting to the high-pressure discharge side of the system
B.Connecting to the low-pressure suction side of the system
C.Connecting to the vacuum pump or refrigerant recovery cylinder
D.Connecting to the high-pressure liquid refrigerant supply tank
Explanation: The blue hose of a standard manifold gauge set connects to the low-pressure (suction) side of the refrigeration system, matching the color-coded blue low-pressure compound gauge. The red hose connects to the high-pressure side, and the center yellow hose is reserved for utility connections like vacuum pumps, recovery units, or refrigerant cylinders.
5Why must a refrigerant recovery cylinder never be filled with liquid refrigerant beyond 80% of its volume capacity?
A.To prevent the cylinder from becoming too heavy to carry according to lifting rules
B.To allow room for liquid expansion when the temperature of the cylinder rises
C.To ensure that there is enough air left to keep the refrigerant fresh
D.To maintain a vacuum seal inside the cylinder valve assembly
Explanation: Refrigerant recovery cylinders must only be filled to a maximum of 80% of their volume capacity to leave adequate space for the liquid refrigerant to expand when exposed to high ambient temperatures. If the cylinder is filled 100% with liquid, any increase in temperature will cause thermal expansion of the liquid, generating extreme hydrostatic pressure that can rupture the cylinder, leading to an explosion.
6What unit of measurement is displayed on a digital vacuum gauge to indicate that a deep, high-quality vacuum has been achieved?
A.Pounds per square inch (psi)
B.Inches of mercury (in. Hg)
C.Microns
D.Bar
Explanation: A digital vacuum gauge (micron gauge) measures deep vacuums in microns, where 1 micron equals 1/1000th of a millimeter of mercury. Standard HVAC/R evacuation procedures require pulling a vacuum down to at least 500 microns to ensure moisture and non-condensable gases are completely removed. Dial gauges using inches of mercury (in. Hg) are not precise enough to measure deep vacuums.
7What is the primary purpose of using a dedicated refrigerant recovery machine during system servicing?
A.To filter out acid and clean the refrigerant inside the operating unit
B.To compress air and pressure-test the copper coils for leaks
C.To extract refrigerant from a system and transfer it to an external storage cylinder without venting it
D.To vacuum out moisture and boil off water inside the evaporator coil
Explanation: A refrigerant recovery machine is used to extract refrigerant vapor and liquid from a refrigeration system and pump it into an external recovery cylinder. This process prevents the harmful release of ozone-depleting substances (ODS) and greenhouse gases into the atmosphere, which is strictly prohibited under international protocols and EPA Ghana regulations. A recovery machine is not designed for system dehydration or leak testing.
8Which of the following is the safest and most effective method to locate a small refrigerant leak in a pressurized HVAC/R piping joint?
A.Holding a lit match or candle flame near the joint to see if the flame changes color
B.Applying an approved soap bubble solution or using an electronic leak detector
C.Submerging the entire joint in a bucket of gasoline to observe chemical reactions
D.Listening closely by ear for a whistling sound while the system is turned off
Explanation: Using an approved soap bubble solution (which forms bubbles at the leak site) or an electronic leak detector (which senses halogen gases) are the safest and most effective methods to locate leaks. Holding an open flame near joints is extremely dangerous due to the risk of igniting oil or flammable refrigerants, and it can release highly toxic phosgene gas if halocarbon gases are burned.
9During a system evacuation, if the vacuum pressure rises immediately after turning off the vacuum pump valves and continues to rise toward atmospheric pressure, what does this indicate?
A.The system has successfully achieved a complete dehydration level
B.There is an active physical leak in the system piping or connections
C.The vacuum pump oil is clean and operating at maximum efficiency
D.Liquid refrigerant is boiling off slowly inside the accumulator
Explanation: A rapid, continuous rise in pressure back to atmospheric level after valving off the vacuum pump indicates a physical leak in the system, allowing outdoor air to enter. If the vacuum pressure rises slightly and then stabilizes, it usually indicates that moisture is still boiling off inside the system, which requires further evacuation.
10What is the primary technical reason for using a reamer on copper tubing after cutting it with a wheel cutter?
A.To reduce the outside diameter of the tube to fit into smaller fittings
B.To remove the internal burr created by the cutter to prevent restricted refrigerant flow and turbulence
C.To polish the outer surface of the copper to ensure a shiny brazing joint
D.To increase the thickness of the copper wall at the joint location
Explanation: Cutting copper tubing with a wheel cutter creates an internal ridge or burr that reduces the pipe's internal cross-sectional area. Reaming removes this burr, restoring full flow area and preventing refrigerant turbulence, pressure drops, or damage to compressor valves from dislodged metal shavings.

About the gh-ctvet-cert-ii-refrigeration-ac Exam

The CTVET Certificate II in Refrigeration and Air Conditioning is the national qualification for HVAC/R tradespersons in Ghana. It covers basic thermodynamic principles, the vapor compression cycle, system component functions (compressors, condensers, evaporators, expansion devices), safety standards for refrigerant handling (including EPA Ghana rules on ODS recovery and retrofitting), piping mechanics (brazing and bending), and starting circuits for single-phase and three-phase compressors. Candidates must pass both the written trade theory paper and a hands-on practical assessment to achieve certification.

Exam sponsor: Commission for Technical and Vocational Education and Training (CTVET), Ghana. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 multiple-choice questions covering trade theory, refrigeration science, electrical controls, and safety protocols

Time Limit

2 hours

Passing Score

50% or competent score

Exam / Certification Fees

approx. GH¢300

Exam sponsor website

Reported exam pass rate: ~70%. estimated average pass rate This describes exam candidates, not OpenExamPrep users or results from using our resources. 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.

15%

Workshop Safety, Health, and Tools

Safe workshop practices, personal protective equipment (PPE), hazard identification, fire safety, and correct use of HVAC/R tools (manifold gauge, vacuum pump, recovery machine).

15%

Basic Thermodynamics and Refrigeration Science

Fundamental physics of heat transfer, pressure-temperature relationships, latent vs. sensible heat, and the components of the standard vapor compression refrigeration cycle.

20%

Refrigeration System Components

Operating principles, types, and functions of main components including compressors, condensers, evaporators, and expansion devices.

15%

Refrigerants, Recovery, and Retrofitting

Properties and classifications of refrigerants, safety classifications (ASHRAE), ozone-depleting substances, recovery methods, leak detection, and retrofitting procedures under Ghana EPA guidelines.

10%

Piping, Bending, and Brazing

Copper pipe selection, tube cutting, swaging, flaring, bending techniques, oxy-acetylene brazing processes, and mechanical pipe joints.

15%

Electrical Circuits and Controls

Basic AC/DC electrical principles, wiring diagrams, starting circuits for single-phase and three-phase motors (PSC, CSIR, CSCR), overload protectors, and thermostats.

10%

Installation, Testing, and Commissioning

Installation of split-system air conditioners and domestic refrigerators, pressure testing with dry nitrogen, system evacuation, gas charging, and operational performance testing.

Preparing for the gh-ctvet-cert-ii-refrigeration-ac Exam

What You Need to Know

  • Passing score: 50% or competent score
  • Assessment: 100 multiple-choice questions covering trade theory, refrigeration science, electrical controls, and safety protocols
  • Time limit: 2 hours
  • Exam / certification fees: approx. GH¢300 Official sources

Using Our Practice Resources

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

gh-ctvet-cert-ii-refrigeration-ac: Suggested Study Strategy

1Master the thermodynamic properties of refrigerant gases and understand the pressure-temperature (P-T) relationships.
2Understand the difference between sensible heat (temperature change only) and latent heat (phase change at constant temperature), especially in evaporators and condensers.
3Learn the legal requirements of EPA Ghana, specifically regarding the prohibition of venting refrigerants and the protocols for reclaiming ODS.
4Practice copper tube preparation, bending without kinking, and performing uniform brazing using oxy-acetylene torches and silver filler rods.
5Study electrical control schematics for refrigeration units, including the start relay (current or potential), overload protector, start/run capacitors, and thermostat.
6Be familiar with the operation of a recovery machine and why cylinders must never be filled beyond 80% liquid volume capacity (safety rule).
7Practice reading mechanical blueprints, component layout diagrams, and refrigerant flow pathways.

Frequently Asked Questions

What is the CTVET Certificate II in Refrigeration and Air Conditioning?

It is a national vocational qualification awarded by the Commission for Technical and Vocational Education and Training (CTVET) in Ghana. It confirms that a technician possesses the fundamental theoretical and practical competencies required to carry out safe installation, troubleshooting, and repair of refrigeration and air conditioning systems.

Which body regulates refrigerant gases and environmental safety in Ghana?

The Environmental Protection Agency (EPA) of Ghana, in partnership with the National Ozone Unit, regulates the import, usage, recovery, and disposal of ozone-depleting substances (ODS) and greenhouse gases like HCFCs and HFCs, aligned with the Montreal Protocol.

What is the required procedure for charging and testing an AC system?

Prior to charging, the system must undergo leak testing (using dry nitrogen), deep evacuation using a vacuum pump (typically down to 500 microns to remove moisture and non-condensables), and then refrigerant charging, preferably by weight as specified on the manufacturer's nameplate.

What is the passing score for the CTVET Certificate II Refrigeration & AC exam?

Both the written trade theory exam and the practical workshop assessments require a minimum score of 50% to be certified as competent.

Can I pursue higher education after completing this Certificate II?

Yes. Technicians holding this qualification can gain direct entry or advanced standing into Higher National Diploma (HND) or Bachelor of Technology (B.Tech) programs in Mechanical Engineering (Refrigeration/Air Conditioning option) at technical universities in Ghana.