Refrigerants

20 Questions | Total Attempts: 128

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Refrigerants

This quiz is designed to help students with Refrigerants exam.


Questions and Answers
  • 1. 
    Which of the following chemical elements is not found in HFC refrigerants?
    • A. 

      Carbon

    • B. 

      Flurine

    • C. 

      Chlorine

    • D. 

      Hyrdogen

  • 2. 
    HFC refrigerants are considered ozone friendly, but they should not be vented to the atmosphere because?
    • A. 

      They are flammable

    • B. 

      They are toxic

    • C. 

      They have a high Global Warming Potential

    • D. 

      They are both toxic and flammable

  • 3. 
    Which of the following is not considered to be a natural refrigerant?
    • A. 

      R407C

    • B. 

      R744

    • C. 

      R600a

    • D. 

      R717

  • 4. 
    Refrigerants which change state twice in a system are called:
    • A. 

      Secondary refrigerants

    • B. 

      Primary refrigerants

    • C. 

      Ternary refrigerants

    • D. 

      Expendable refrigerants

  • 5. 
    Which of the following is not a result of ozone depletion?
    • A. 

      Increased sea levels

    • B. 

      Reduced levels of phytoplankton

    • C. 

      Increased rates of skin cancer

    • D. 

      Reduced crop yields

  • 6. 
    Which of the following statement holds ture for an Azeotropic refrigerant?
    • A. 

      They have a noticeable glide

    • B. 

      They do not fracture

    • C. 

      They consist of 1 pure refrigerant only

    • D. 

      Their composition changes as they undergo a change in state

  • 7. 
    Which of the following statements holds true for a superheated refrigerant?
    • A. 

      The temperature of superheated refrigerant is always high

    • B. 

      If heat is removed the temperature will remain stable

    • C. 

      A superheated refrgerant could become saturated

    • D. 

      A superheated refrgerant is always a vapour

  • 8. 
    The specific aim of Montreal Protocol is to:
    • A. 

      Phase out synthetic greenhouse gases

    • B. 

      Reduce the worlds output of CO2 from burning fossil fuels

    • C. 

      Phase out ozone depleting substance

    • D. 

      Increase the energy performance of mordern HVAC equipment

  • 9. 
    CO2 has a global warming potential of 1. What is the global warming potential of R404A?
    • A. 

      0

    • B. 

      38

    • C. 

      380

    • D. 

      3800

  • 10. 
    It is essential that the oil in a hermetic compressor:
    • A. 

      Have a high dielectric strength

    • B. 

      Have a low miscibility with the system refrigerant

    • C. 

      Be extremely hygroscopic

    • D. 

      Be compatible with the materials used in the shaft seal

  • 11. 
    Alkyl Benzene lubricant would be most commonly associated with:
    • A. 

      R12 in an older style domestic refrigerator

    • B. 

      R410A in a mordern split system air conditoner

    • C. 

      R404A in a commercial ice-cream cabinet

    • D. 

      R410A in a retrofitted cool room

  • 12. 
    Which of the following refrigerants has the highest Global Warming Potential
    • A. 

      R717

    • B. 

      R744

    • C. 

      R410A

    • D. 

      R600a

  • 13. 
    Refrigerant R744 is often used in a cascade system. In these systems:
    • A. 

      There are 2 refrigerant circuits and 2 different refrigerants

    • B. 

      There are 2 refrigerant circuits and only 1 type of refrigerant

    • C. 

      There is 1 refrigerant circuit and 2 different refrigerants

    • D. 

      There is 1 refrigerant circuit and only 1 type of refrigerant

  • 14. 
    Which of the following will ensure the fastest evacuation of a system?
    • A. 

      Short hoses with a small diameter, compressor service valves mid-seated

    • B. 

      Large diameter hoses, all service valves back seated, system fans running

    • C. 

      Short hoses with a large diameter, compressor service valve mid-seated

    • D. 

      Long hoses with a large diameter, compressor service valve mid seated

  • 15. 
    Requirements for the repair of a small self contained refrigeration system (e.g. an ice-cream cabinet) would be found in which part of the new Refrigerant Handling Code of Good Practice.
    • A. 

      Part 1

    • B. 

      Part 2

    • C. 

      Part3

    • D. 

      The new Code of Practice does not cover self contained systems

  • 16. 
    To satisfy all state and national codes, to  install a split system air conditioner in NSW a technician must have:
    • A. 

      A minimum Restricted Air Conditioning Installation and Decommissioning Licence from the Australian Refrigerant Council

    • B. 

      A minimum Full Refrigerant and Air Conditioning Licence from the Australian Refrigerant Council

    • C. 

      A Full Refrigerant and Air Conditioning Licence from the Australain Refrigeration Council plus a Qualifed Supervisor Certificate from the Department of Fair Trading

    • D. 

      A minimum Qualified Supervisor Certificate from the Department of Fair Trading

  • 17. 
    A hlide lamp is a SUITABLE leak detection method for which of the following refrigerants?
    • A. 

      R600a

    • B. 

      R134a

    • C. 

      R290

    • D. 

      R11

  • 18. 
    Under the new Refrigerant Handling Code of Practice, an acceptable method/methods of recovering refrigerant from a small contained system such as a domestic refrigerator would be:
    • A. 

      Purging to atmosphere if only small amounts involved

    • B. 

      Refrigerant recovery unit and cylinder

    • C. 

      Flexible recovery bag

    • D. 

      Both b and c

  • 19. 
    For the deep evacuation method a technicial knows an adequate vacuum has been achieved by:
    • A. 

      Leaving the vacuum pump runnig for at least half an hour

    • B. 

      Monitoring the amount of vapour being emitted from the exhaust

    • C. 

      Monitoring the compound (blue) gauge on his/her service manifold

    • D. 

      Monitoring the vacuum level with an electronic vacustat

  • 20. 
    A suction burnout drier is fitted with Schrader access ports to allow:
    • A. 

      The refrigerant to be recovered

    • B. 

      A vacuum to be pulled

    • C. 

      Pressure drop to be monitored

    • D. 

      Refrigerant to be charged