type II

  1. the condition and state of the refrigerant leaving the accumulator of a system is
    superheated low pressure vapor
  2. a ___________ type refrigerant has different saturated vapor pressures at the same temperature in the evaporator and in the condenser of the refrigeration system. the term used to describe this condition is called temperature glide
    near-azeotrope and blended
  3. deep vacuums used for evacuation and dehydration of systems are measured in
  4. with the exception of industrial processes and commercial refrigeration if a system with a charge of 50 pds or more leaks at an annual rate of 15% the owner must
    notify EPA of the leak and have a leak repaired within 30 days unless the owner has valid contract to rebuild or replace the equipment within one year
  5. the only refrigerant approved by the EPA to be used as a trace gas with nitrogen to test for a leak (except for systems using R-134a is
  6. with an air cooled condenser on the roof of a two story building and the evaporator on the first floor it would be best to start recovery from
    the liquid line entering the evaporator
  7. traces of oil around the sight glass, machined, or brazed joints of a refrigeration system may be an indication of
    a leak
  8. one of the easiest ways to identify the type refrigerant in a system is to
    check the name plate data
  9. front seating the three way suction service valve will close the
    suction line inlet to the valve
  10. when using a refrigerant as a trace gas to locate a leak, which refrigerant should you use?
  11. type II clasification as defined by EPA applies to what equipment?
    air conditioning systems over 5 lbs refrigerant
  12. under the exceptions to required evacuation levels an appliance can be evacuated to 0 psig when
    the required levels cannot be reached due to leaks or the recovered refrigerant would be contaminated
  13. the condition and state of the refrigerant in the condenser is
    a mixture of high pressure high temperature vapor and liquid
  14. since___________ it has been illegal to knowingly release refrigerants during the service maintenance repair and disposal refrigerated appliances
    july 1st 1992
  15. the recovery of refrigerant in the vapor phase will minimize the loss of
  16. refrigerant vapors or mist in high concentrations should not be inhaled since they have been demonstrated to cause
    heart irregularities unconsciousness and oxygen deprivation
  17. EPA defines a major repair as replacing the
    compressor condenser and evaporator
  18. The EPA will pay awards of up to _________ to any person who furnishes information which leads to criminal conviction of anyone commiting a violation of the clean air act
  19. the excise tax on refrigerants applies to ____ refrigerants
  20. True or False: service on a small appliance can be performed by a technician with type II and type III certifications or both
  21. at an ambient temperature of 80°F the pressure in a cylinder containing R-22 will be approximately
    143 psig
  22. refrigerant should be recovered first as a
    vapor from the low side
  23. a condition of excessive superheat could be an indication of
    a dirty condenser
  24. non condensibles in an air conditioning or refrigeration system will
    tend to stay in the top portion of the condenser, increase the high side pressure and be removed by the recovery machine
  25. you have just recovered some R-22 and the next service call requires you to recover R-502 what must you do before starting recovery of the R-502
    recover R-22 from the recovery machine, change the recovery machine driers and evacuate the recovery machine
  26. which refrigerants can be used for leak detection as a trace gas and pressurized with nitrogen?
  27. type II certification applies to
    high and very high pressure refrigerants
  28. True or False:
    R-134a is a drop in replacement for R-12
  29. True or False: if nitrogen is not available to use with a trace gas to test for a leak compressed air may be used as a substitute
  30. every refrigerating system shall be protected from high pressure by a ___________
    pressure relief valve, rupture disk, and fusible plug
  31. the oils that should be used with HFC-134a refrigeration applications are
    synthetic esters
  32. the color code for recovery vessels is
    gray with a yellow top
  33. industrial process and commercial refrigeration equipment with an annual leak rate of _____% requires repairs under spa regulations
  34. at 70° ambient temperature R-22 will have a saturated vapor pressure of
    121.5 psig
  35. what type of refrigerant would you expect to find in a residential air conditioning system
  36. many larger refrigeration compressors use an open type compressor which part of the compressor is likely to leak if the unit is shut down for long periods?
    rotating shaft seal
  37. which refrigerant requires its own special set of hoses gauges vacuum pump recovery machine and oil containers?
  38. pressure relief valves must never be
    used if rusted or corroded, installed in series, and tied down
  39. system dependent recovery equipment can not be used when
    the charge exceeds 15 pds
  40. the recovery process can be speeded up by
    putting the recovery tank in cold water
  41. recovery units manufactured before november 15 1993 are required to reach recovery levels of _______ on an R-22 appliance if the charge is more than 200 pounds
    4 inches Hg
  42. recovery units manufactured before november 15 1993 are required to reach recovery levels of _______ on an R-22 appliance if the charge is less than 200 pounds
    0 inches Hg
  43. the required level of evacuation for recovery equipment manufactured after november 15 1993 on a system containing less than 200 pds of R-12 is
    10 inches Hg
  44. recovery units manufactured after november 15 1993 are required to reach recovery evacuation levels of _______ on an appliance using other high pressure refrigerants if the charge is more than 200 pds
    15 inches Hg
  45. it a technicians recovery equipment was manufactured before november 15 1993 he must evacuate a refrigeration system containing 10 pds of R-500 to
    4 inches Hg
  46. as defined by ASHRAE standard 15 a sensor and alarm are required for A1 refrigerants to sense
    oxygen deprivation
  47. 1 mm of mercury (Hg)=0.039 inches of mercury=_________microns
  48. which of the following statements is NOT true of EPA approved recovery equipment manufactured after november 15 1993

  49. when evacuating a vapor compression system the vacuum pump must be capable of pulling vacuum of _______ microns
  50. refrigerants with a boiling point of between -50 and 10+ degrees celsius are defined by the EPA as refrigerants: 12,22,114,132a,500 and 502 the refrigeration unit using any of these gases is called
    high pressure appliance
Card Set
type II
epa exam