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Specialist Activities – Refrigeration and Air Conditioning

Construction Test > Specialist Activities – Refrigeration and Air Conditioning

You need to answer at least 39 out of 46 questions correctly to pass the Refrigeration and Air Conditioning Specialist Activities Test. Answers may be reviewed after each question or at the end of the test. Good luck!

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List of questions in above test (quick view). Click question box to reveal correct answer.
1. You are installing a commercial refrigeration system for a restaurant. What might create an ignition hazard? Give ONE answer
A Ammonia in the refrigeration system
B Hydrocarbon gases in the refrigeration system
C Methane gas in the refrigeration system
D Silica in the component parts
Correct Answer: B Hydrocarbon gases in the refrigeration system
Explanation: Some refrigeration systems use hydrocarbons, which are highly flammable.
2. Which THREE of the following describe reasons why gases must be used safely? Give THREE answers
A They are expensive to acquire
B They can create contagious health conditions
C They may be environmentally damaging
D They may be explosive
E They may be highly pressurised when stored
Correct Answer: C They may be environmentally damaging, D They may be explosive, E They may be highly pressurised when stored
Explanation: Gases can be dangerous for a number of reasons when not used safely. Mainly, they are highly pressurised, and potentially explosive or environmentally harmful.
3. You have finished using a refrigerant cylinder - how should you store it? Give ONE answer
A In a refrigerated cellar
B In a secure, fully enclosed compound
C In a secure, outdoors compound
D In a warehouse
Correct Answer: C In a secure, outdoors compound
Explanation: Refrigerants require special storage in a secured, specialised compound.
4. If a refrigerant gas is released into an enclosed room, how would it behave? Give ONE answer
A It would distribute evenly throughout the room
B It would gather at the corners of the room
C It would pool at the lowest point in the room
D It would rise to the top of the room
Correct Answer: C It would pool at the lowest point in the room
Explanation: Refrigerant gases are heavier than air, so will pool at the lowest point in the room.
5. You need to transport a refrigerant gas cylinder from one site to another. How should you store it in the van? Give ONE answer
A Securely and on its side
B Securely and upright
C You must never transport refrigerant cylinders in a van
D You must use a specialised transport container in the van
Correct Answer: D You must use a specialised transport container in the van
Explanation: Refrigerant cylinders require specialised transportation containers.
6. Which THREE of the following items of PPE MUST be worn when handling refrigerant gas? Give THREE answers
A Ear protection
B Eye protection
C Half-mask respirator
D Helmet
E Overalls
F Thermal resistant gloves
Correct Answer: B Eye protection, E Overalls, F Thermal resistant gloves
Explanation: You must wear overalls, eye protection, thermal resistant gloves, and also safety boots when handling refrigerant gas.
7. What is a flashback arrestor? Give ONE answer
A A device preventing flames from tracking back into gas cylinders
B A device preventing hoses from whipping when broken
C A fire extinguishing tool that must be on hand when using gas cylinders
D An item of PPE protecting workers from fire in case of incident
Correct Answer: A A device preventing flames from tracking back into gas cylinders
Explanation: Flashback arrestors must be fitted between gauges and pipes when using brazing equipment powered by oxypropane. They prevent flames from flashing back into the cylinder.
8. You are using nitrogen to pressure-test a flange following repairs. What TWO checks must you carry out before beginning? Give TWO answers
A Are you wearing a helmet?
B Can the gauge tolerate the required pressure level?
C Is the flange at the required temperature?
D Is the nitrogen cylinder horizontal and secured?
E Is the nitrogen cylinder upright and secured?
Correct Answer: B Can the gauge tolerate the required pressure level?, E Is the nitrogen cylinder upright and secured?
Explanation: You must ensure that the gauge can handle the required pressure, and that the nitrogen cylinder is upright and secured.
9. When MUST you use oxygen for pressure testing? Give ONE answer
A Never
B When parts of the pipe are oxidised
C When the pipe is lead, or may contain asbestos
D When working in an enclosed space
Correct Answer: A Never
Explanation: You must never conduct pressure tests using oxygen.
10. Why must oxygen NEVER be used for pressure testing? Give ONE answer
A Because it can react with compressor oil to cause an explosion
B Because it may react with carbon dioxide in the air, creating a toxic gas
C Because it may react with oxidation in the pipework, damaging the materials
D Because it requires dangerously high levels of pressure
Correct Answer: A Because it can react with compressor oil to cause an explosion
Explanation: Oil in the compressor can react explosively with oxygen if it is used to carry out a pressure test.
11. Whilst installing a refrigeration system in an enclosed commercial kitchen, you notice and report a refrigerant leak. What must happen now? Give ONE answer
A Nobody can continue work until the appropriate PPE and RPE has been distributed
B Nobody must enter the area until it is safe to do so
C Nothing in particular
D The health and safety executive must be informed
Correct Answer: B Nobody must enter the area until it is safe to do so
Explanation: Nobody may enter an enclosed area following a refrigerant leak until it has been cleared as safe to do so.
12. What must you ensure BEFORE entering a cold-room? Give ONE answer
A That the door has a handle on the inside
B That the entry handle on the outside is not too cold to touch
C That there is a doorstop in place to prevent the door closing behind you
D That you are wearing thermal-resistant gloves
Correct Answer: A That the door has a handle on the inside
Explanation: Cold-rooms must be fitted with a handle on the inside before you can safely enter.
13. You have been tasked with working on a vapour compression refrigeration system. The level of installed power that is uses is 30 kW. Do you need to produce a written scheme of examination? Give ONE answer
A No
B Yes
Correct Answer: B Yes
Explanation: If a vapour compression refrigeration system uses a level of installed power higher than 25 kW, you must legally produce a written scheme of examination.
14. A piece of refrigeration plant has not yet been commissioned, but you have finished installing it. How should you leave it? Give ONE answer
A You must lock off all switches and valves
B You must lock off all valves but leave the switches on
C You must lock on all switches and valves
D You must turn off all switches but lock the valves open
Correct Answer: A You must lock off all switches and valves
Explanation: Uncommissioned plant that you have finished installing must have all valves and switches locked in the 'off' position.
15. You need to cut through a refrigerant pipe - what should happen to the leaked refrigerant gas? Give ONE answer
A It must be recovered, and you should record the incident
B You must evacuate the room to allow it to dissipate to a safe level
C You must never cut a pipe where it will result in leaked refrigerant gas
D You must recover it
Correct Answer: A It must be recovered, and you should record the incident
Explanation: Where it is impossible to avoid cutting a refrigerant pipe, the gas must be recovered and the incident recorded.
16. You need to access a riser duct to carry out repairs - how should you proceed regarding access? Give ONE answer
A Through a tally system
B You must always work in pairs
C You must carry a full face respirator
D You must put in place a permit to work system
Correct Answer: D You must put in place a permit to work system
Explanation: A permit to work system is required where access to risers is required
17. In order to access a tight spot with your tool, you need to use an extension cable. How should this cable be placed? Give ONE answer
A Place it across the floor where it is clearly visible
B Place it so that the distance between the tool and the socket is as short as possible
C Place it so that there is plenty of slack in the cable
D Place it where it will not create a trip hazard
Correct Answer: D Place it where it will not create a trip hazard
Explanation: You must ensure that extension cables do not create a trip hazard.
18. A system requires maintenance, and it contains refrigerant gases. Who is permitted to carry out this work? Give ONE answer
A A trained, competent employee of a company that is F-gas registered.
B Someone who is familiar with the system
C Someone who is trained and competent
D Someone who is trained and over the age of 21
Correct Answer: A A trained, competent employee of a company that is F-gas registered.
Explanation: Any kind of work involving systems that contain refrigerant gases must be carried out by trained, competent employees of F-gas registered companies.
19. What is welding flash? Give ONE answer
A A corneal burn caused by the light from a welding torch
B A neurological condition caused by gas from the welding torch
C The light created from the welding torch
D When flames from a welding torch flash back to the gas cylinder
Correct Answer: A A corneal burn caused by the light from a welding torch
Explanation: Welding flash is when light from the welding iron causes burns to the cornea.
20. You notice that the plug casing on your circular saw is loose. What should you do? Give ONE answer
A This item is defective: you must fix it
B This item is showing cosmetic damage: no action is required
C This tool is defective: you must mark it, and follow the procedure in place for defective items
D This tool is showing signs of wear: you must monitor it for further damage
Correct Answer: C This tool is defective: you must mark it, and follow the procedure in place for defective items
Explanation: Defective items must be marked and dealt with according to procedure.
21. You need to run an engine-driven generator inside an outhouse where you are working. Where should the exhaust be positioned? Give ONE answer
A Facing away from your workstation
B Facing towards an air duct
C On the inside of the building
D On the outside of the building
Correct Answer: D On the outside of the building
Explanation: Always position the exhaust of engine-driven generators outside of a building.
22. You have just finished installing a new refrigeration system. Which TWO of the following must be your first actions? Give TWO answers
A Assess the risk of the installation
B Inform your supervisor
C Leak test the system
D Pressure test the system
E Put the system into operation
Correct Answer: C Leak test the system, D Pressure test the system
Explanation: Your first courses of action must be to pressure test and leak test any newly-installed refrigeration systems.
23. You need some temporary wiring to be installed for a power tool you will be briefly using. How should you proceed? Give ONE answer
A Find a similar tool that has the required wiring, and make it work for the job
B Find an electrician on site who can install the temporary wiring for you
C Find some wire and carry out the job yourself
D Pause your work until authorised supply installation can be completed
Correct Answer: D Pause your work until authorised supply installation can be completed
Explanation: Do not proceed until authorised wiring can be installed.
24. There is an oil spill from a tool you are using, but you do not have any materials at hand to clean it up. How should you proceed? Give ONE answer
A Avoid the spill and continue working
B Ensure people do not approach the spill, and report the spill to your supervisor
C Leave the site to purchase the materials required to clean it up
D Use any absorbent items of PPE (overalls, face masks, etc.) to mop up the spill
Correct Answer: B Ensure people do not approach the spill, and report the spill to your supervisor
Explanation: Any spills that cannot immediately be cleaned up should be reported, and people must stay clear of it.
25. When removing tiling from a wall, you notice a substance that could be asbestos. How should you proceed? Give ONE answer
A Avoid disturbing the tiles if possible, and continue work
B Contact a laboratory to arrange testing
C Pause all work and report this to your supervisor
D Request a full-face respirator
Correct Answer: C Pause all work and report this to your supervisor
Explanation: Do not work where you suspect asbestos may be present. Report it to your supervisor.
26. You are conducting brazing work with oxyacetylene powered equipment. What must be in place between the pipes and gauges of this equipment? Give ONE answer
A Flashback arrestors
B Pressure valves
C Rubber insulation
D Whip checks
Correct Answer: A Flashback arrestors
Explanation: You must ensure flashback arrestors are in place when using oxyacetylene brazing equipment.
27. You notice a coloured wire sticking out of the casing for the plug on your mains powered drill. How should you proceed? Give ONE answer
A Carry out some basic electrical repairs and then continue
B Mark the defective item, and deal with it according to company procedure
C Put the tool to one side and find a replacement
D Tuck the wire back into the casing and continue
Correct Answer: B Mark the defective item, and deal with it according to company procedure
Explanation: You must make sure to mark all defective equipment, and deal with it according to procedure.
28. The welfare cabin on your site uses a portable hob powered by an LPG cylinder. Where must this cylinder be positioned? Give ONE answer
A By a window inside the cabin
B Indoors, by the door of the cabin
C Next to the cabin's fire extinguisher
D On the outside of the cabin
Correct Answer: D On the outside of the cabin
Explanation: LPG cylinders must be positioned outside of any cabin here they are being used to power appliances inside of it.
29. Some equipment requires regular PAT testing, other equipment does not. Which of the following does NOT? Give ONE answer
A 110 volt electrically powered circular saw
B Battery powered rechargeable drill
C Charger for battery powered drill
D Toaster in welfare facilities
Correct Answer: B Battery powered rechargeable drill
Explanation: The battery powered, rechargeable drill does not need a PAT test.
30. You are carrying an oxygen cylinder from the offload area to the storage compound. Why must you be particularly careful? Give ONE answer
A Because the contents has an extremely high pressure
B Because the contents is extremely expensive
C Because the contents will harm the environment if it spills
D Because the cylinders are fitted with a slow leak
Correct Answer: A Because the contents has an extremely high pressure
Explanation: Oxygen cylinders are filled to high pressures, making them hazardous to handle.
31. Your team has evacuated a work area after reports of a refrigerant leak. Under what condition can you re-enter the area? Give ONE answer
A It must be established that it is safe to do so
B You must be only using intrinsically safe tools
C You must be under a tight deadline
D You must be wearing a full face respirator
Correct Answer: A It must be established that it is safe to do so
Explanation: Only re-enter the area where a refrigerant leak has taken place once it has been assessed as safe to do so.
32. You are carrying out a lifting operation, and want to double check the next step in the order of operations. Which document can you refer to? Give ONE answer
A HSE documentation
B The COSHH assessment
C The construction phase plan
D The method statement
Correct Answer: D The method statement
Explanation: The order of operations will be confirmed and detailed in the method statement
33. You need to run an extension lead from one side of the room to another. Which TWO of the following must you be careful of? Give TWO answers
A Not creating a trip hazard
B The voltage
C Whether there is water on the floor
D Whether you have a permit
E Who is in the room with you
Correct Answer: A Not creating a trip hazard, C Whether there is water on the floor
Explanation: Extension leads must be positioned so they are away from water, and do not create a trip hazard.
34. Why must your eye protection be fitted with tinted filter lenses if you are flame cutting? Give ONE answer
A To protect you from damage caused by infrared radiation
B To protect you from damage caused by ultraviolet radiation
C To protect you from singing your eyelashes
D To protect you from sparks
Correct Answer: A To protect you from damage caused by infrared radiation
Explanation: Welding and flame cutting creates infrared radiation that can damage your eyes - tinted filter lenses will protect you against this.
35. You are loading a heavy duty pallet with a safe working load of 1000kg. What does this mean? Give ONE answer
A The load must be evenly distributed across the pallet
B The load on the pallet must not exceed 1000 kg
C The load on the pallet should be as close to 1000 kg as possible
D The load on the pallet should be at least 1000 kg
Correct Answer: B The load on the pallet must not exceed 1000 kg
Explanation: Safe working load (SWL) describes the maximum weight capacity of a piece of equipment. It must not be exceeded.
36. You are welding on a portion of pipe, and you are leaving to go home in 2 hours. When, at the LATEST, should you usually stop welding? Give ONE answer
A Half an hour before you leave
B Now
C One hour before leaving
D When you leave
Correct Answer: C One hour before leaving
Explanation: When carrying out hotworks, you must ensure you are able to come back and check the area later - this will usually be one hour later.
37. What must you ensure before using a ladder? Give ONE answer
A That defects have been painted over
B That it is secured
C That you are being supervised
D That you are wearing protective gloves
Correct Answer: B That it is secured
Explanation: Ladders must be safely secured to prevent them slipping whilst in use.
38. LPG cylinders and acetylene cylinders have special storage requirements when not in use. Which TWO of the following MUST be true when storing these cylinders? Give TWO answers
A They must be in a securely locked cage
B They must be monitored by CCTV
C They must be no closer than 3m to oxygen cylinders
D They must be stored below room temperature
E They must be stored in a fully enclosed container
Correct Answer: A They must be in a securely locked cage, C They must be no closer than 3m to oxygen cylinders
Explanation: Acetylene and LPG cylinders must be stored in securely locked cages no closer than 3m to oxygen cylinders.
39. You need to move a mobile tower from one side of a room to another to complete a task. What must you do BEFORE moving the tower? Give ONE answer
A Ensure any equipment and people on the tower are secured to it.
B Ensure nobody is on it and equipment and tools are securely tied down
C Ensure there are no equipment or people on it
D You must de-assemble the tower
Correct Answer: C Ensure there are no equipment or people on it
Explanation: Mobile towers must not be moved with people or equipment on them.
40. You are about to begin gas welding with oxyacetylene equipment. Which THREE of the following MUST you ensure are in good condition before continuing? Give THREE answers
A The flashback arrestor
B The hose
C The insurance policy
D The light
E The oxyacetylene cylinder
Correct Answer: A The flashback arrestor, B The hose, E The oxyacetylene cylinder
Explanation: You must check the hose, the flashback arrestor, and the cylinder before beginning work that involves oxyacetylene-powered equipment.
41. What is edge protection? Give ONE answer
A Barriers used to prevent materials and people falling from height
B Covers used with sharp edges to prevent injury
C Guards used on power tools to prevent injury
D Structural support used to prevent collapse in excavations
Correct Answer: A Barriers used to prevent materials and people falling from height
Explanation: Edge protection is used to prevent materials or people falling from height.
42. What is the MAXIMUM height recommended for free-standing mobile towers? Give ONE answer
A 10m in good weather conditions
B 5m
C There is no recommended maximum height
D Whatever the manufacturer recommends
Correct Answer: D Whatever the manufacturer recommends
Explanation: The mobile tower manufacturer will detail the recommended maximum height at which their equipment can be safely used.
43. What edge protection would be suitable if you are going to be working on a flat roof, 1m from the edge, where there is a low parapet? Give ONE answer
A Double guardrails
B Safety nets
C Toe boards
D Toe boards and double guardrails
Correct Answer: D Toe boards and double guardrails
Explanation: Toe boards in addition to double guardrails would be an appropriate form of edge protection.
44. You need to carry out air-conditioning repairs on some ceiling mounted units in a ground floor warehouse. The floor is good, and the space is large, and open-plan. What would be the safest way to access the units? Give ONE answer
A Climb the storage shelves
B Erect a scaffold
C Use a mobile tower
D Use a stepladder
Correct Answer: C Use a mobile tower
Explanation: A mobile tower would be appropriate.
45. You need to fix a broken compressor. It is electrically powered, so you need to isolate it first. What is the MINIMUM you must do to achieve this? Give ONE answer
A Find the local isolator and lock it off
B Find the local isolator, lock it off, and tag it out
C Lock off the local isolator and put up signs so that nobody touches it
D Press the emergency stop button
Correct Answer: B Find the local isolator, lock it off, and tag it out
Explanation: You must locate, lock off, and tag the local isolator as a minimum.
46. What information MUST be visible on all lifting equipment? Give ONE answer
A Chemical components
B Insurance details
C Manufacturer
D Safe working load
Correct Answer: D Safe working load
Explanation: A piece of equipment's safe working load must be visible on the equipment.