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100+ Free SOLAS Refrigeration Practice Questions

SOLAS Ireland Refrigeration & Air Conditioning Apprenticeship practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: SOLAS Refrigeration Exam

100

Practice Questions

OpenExamPrep

4 years

Apprenticeship Length

SOLAS

7 phases

On/Off-the-Job

SOLAS

50%

Pass Mark

SOLAS

NFQ Level 6

Advanced Cert (Craft)

QQI

EU 517/2014

F-Gas Regulation

EPA Ireland

The SOLAS Refrigeration & Air Conditioning apprenticeship is Ireland's standards-based craft route to becoming a qualified refrigeration and air conditioning technician, leading to a QQI Level 6 Advanced Certificate (Craft). It runs over four years across seven alternating on-the-job and off-the-job phases, with modular theory, practical and skills-demonstration assessments. Phase theory exams are graded Pass (50-64%), Merit (65-79%) or Distinction (80-100%), with Merit and Distinction available only at the first attempt and up to three attempts allowed. Content spans the refrigeration cycle and components, refrigerants and EU/Irish F-gas rules, pipework and brazing, controls and electrical work, air conditioning systems, charging and commissioning, fault finding and safety. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample SOLAS Refrigeration Practice Questions

Try these sample questions to test your SOLAS Refrigeration exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the basic vapour-compression refrigeration cycle, which component absorbs heat from the space or product being cooled?
A.Condenser
B.Evaporator
C.Compressor
D.Expansion valve
Explanation: The evaporator is the heat-absorbing component: low-pressure liquid refrigerant boils inside it, drawing latent heat from the air, water or product being cooled. The refrigerant leaves the evaporator as low-pressure vapour.
2Which component in the refrigeration cycle increases the pressure and temperature of the refrigerant vapour?
A.Evaporator
B.Expansion valve
C.Compressor
D.Receiver
Explanation: The compressor is the work-input device. It draws low-pressure vapour from the suction line and raises it to high pressure and high temperature, which allows the refrigerant to reject heat in the condenser. It is normally the largest electrical load in the system.
3Superheat is best defined as the number of degrees a refrigerant vapour has been heated:
A.Above its saturation (boiling) temperature at the prevailing pressure
B.Below its saturation temperature at the prevailing pressure
C.Above the ambient air temperature
D.Above the condensing temperature
Explanation: Superheat is the temperature rise of the vapour above its saturation (boiling) point for the pressure it is at. Measuring superheat at the evaporator outlet confirms that all the liquid has boiled off, protecting the compressor from liquid slugging.
4Subcooling of the liquid refrigerant in the liquid line is important mainly because it:
A.Increases the suction pressure
B.Ensures a full column of liquid reaches the metering device, preventing flash gas
C.Raises the discharge temperature
D.Reduces the oil return to the compressor
Explanation: Subcooling cools the liquid below its saturation temperature so it stays 100% liquid in the liquid line. This guarantees the metering device receives solid liquid rather than a mix of liquid and flash gas, which would reduce evaporator capacity.
5During the change of state in the evaporator, the refrigerant absorbs heat while its temperature remains essentially constant. This heat is called:
A.Sensible heat
B.Latent heat
C.Specific heat
D.Superheat
Explanation: Latent heat is the heat absorbed or released during a change of state (boiling or condensing) at constant temperature. The high latent heat of vaporisation is what makes the boiling refrigerant in the evaporator such an effective heat absorber.
6What is the primary function of the receiver in a refrigeration system?
A.To separate oil from the refrigerant vapour
B.To store the high-pressure liquid refrigerant and accommodate changes in charge
C.To remove moisture from the system
D.To reduce vibration in the suction line
Explanation: The liquid receiver, fitted after the condenser, stores high-pressure liquid refrigerant. It accommodates variations in system charge as load changes and ensures a steady liquid supply to the metering device.
7A filter drier is installed in the liquid line primarily to:
A.Increase refrigerant flow rate
B.Remove moisture, acids and solid contaminants from the refrigerant
C.Lower the condensing pressure
D.Add lubricating oil to the refrigerant
Explanation: The filter drier contains a desiccant and filtration medium that removes moisture, acid and particulate contamination from the circulating refrigerant. Moisture is especially harmful because it can freeze at the metering device and form corrosive acids with the oil.
8On a pressure-enthalpy (p-h) diagram, the work of compression is represented by the change in enthalpy across the:
A.Evaporator
B.Condenser
C.Compressor
D.Expansion valve
Explanation: On the p-h chart, compression moves the refrigerant up along a line of (approximately) constant entropy; the horizontal enthalpy increase across this process is the heat-equivalent of the work of compression done on the refrigerant.
9The throttling process through an expansion valve takes place at approximately constant:
A.Temperature
B.Pressure
C.Enthalpy
D.Volume
Explanation: Expansion through a metering device is a throttling process in which enthalpy stays essentially constant while pressure and temperature drop sharply. Some liquid flashes to vapour, cooling the remaining liquid to the evaporator temperature.
10The Coefficient of Performance (COP) of a refrigeration system is calculated as:
A.Work input divided by refrigerating effect
B.Refrigerating effect divided by work input
C.Heat rejected divided by refrigerating effect
D.Refrigerating effect multiplied by work input
Explanation: COP for cooling is the useful refrigerating effect (heat absorbed in the evaporator) divided by the work input to the compressor. A higher COP means more cooling is achieved per unit of energy consumed.

About the SOLAS Refrigeration Practice Questions

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