epa universal certification

EPA 608 Core exam: Free Online Practice Test 1

Question 1 of 20

  1. 1 pointsLifetime of CFCs is believed to be in the range ______ :Correct

    CFCs are highly stable in lower atmosphere and have a lifetime of about 20 to 100 years. This higher lifetime helps in diffusing CFCs into stratosphere where CFC molecule react with UV radiation depleting ozone layer.

    Incorrect

    CFCs are highly stable in lower atmosphere and have a lifetime of about 20 to 100 years. This higher lifetime helps in diffusing CFCs into stratosphere where CFC molecule react with UV radiation depleting ozone layer.

  2. Question 2 of 201 pointsOne chlorine atom in stratosphere can able to destroy approximately _______ number of ozone molecules:

    Correct

    In stratosphere, when sun’s UV radiation breaks down the CFC molecule chlorine ion is formed. This chlorine ion strips an oxygen atom from ozone (O3) forming chlorine monoxide (ClO) and molecular oxygen (O2). The formed chlorine monoxide (ClO) radical strips another free oxygen atom and releases the chlorine ion to repeat the process. This process continuous in cycle resulting in greater depletion of ozone layer.

    Image result for ozone depletion equation

    Incorrect

    In stratosphere, when sun’s UV radiation breaks down the CFC molecule chlorine ion is formed. This chlorine ion strips an oxygen atom from ozone (O3) forming chlorine monoxide (ClO) and molecular oxygen (O2). The formed chlorine monoxide (ClO) radical strips another free oxygen atom and releases the chlorine ion to repeat the process. This process continuous in cycle resulting in greater depletion of ozone layer.

    Image result for ozone depletion equation

  3. Question 3 of 201 pointsWhich one of the following has highest Ozone Depletion Potential (ODP):

    Correct

    CFCs has highest Ozone Depletion Potential because of the presence of chlorine element which reacts with ozone at stratosphere

    Incorrect

    CFCs has highest Ozone Depletion Potential because of the presence of chlorine element which reacts with ozone at stratosphere

  4. Question 4 of 201 pointsHalons were completely phased out by ______ :
  5. Question 5 of 201 pointsA violation of the Clean Air Act, including improper record keeping, is subject to a penalty of a fine of up to _____ per day per violation:
  6. Question 6 of 201 pointsThe ____connects the evaporator to the compressor in a refrigerant system:

    Correct

    Suction line brings low pressure vapor from evaporator to compressor

    Incorrect

    Suction line brings low pressure vapor from evaporator to compressor

  7. Question 7 of 201 pointsAt which of the following stage in refrigeration cycle does the refrigerant changes from high-pressure vapor to a high-pressure liquid:

    Correct

    As heat is removed from the refrigerant at condenser, it reaches its saturation temperature and starts to flash (change its state) into high pressure liquid

    Incorrect

    As heat is removed from the refrigerant at condenser, it reaches its saturation temperature and starts to flash (change its state) into high pressure liquid

  8. Question 8 of 201 pointsTXV valve maintaining the pressure difference between _____ and _____ of the system

    Correct

    Thermostatic Expansion Valve connected between condenser and evaporator helps in regulating the flow of liquid refrigerant entering the evaporator for variation in the load. It helps in maintain the predetermined constant evaporator superheat in refrigeration system.

    Incorrect

    Thermostatic Expansion Valve connected between condenser and evaporator helps in regulating the flow of liquid refrigerant entering the evaporator for variation in the load. It helps in maintain the predetermined constant evaporator superheat in refrigeration system.

  9. Question 9 of 201 pointsWhich of the following is not most effective way to detect the general area of a small leaks:

    Correct

    Electronic leak detector can able to detect the leak rates of about 0.5 oz per year. Ultra sound leak detector listens to the noise of gas leakage.Fluorescent leak detector detects the leak with the help of dyes. These dyes can cause strains on the equipment and foreign substances in dyes could invalidate the warranty. Also this method cannot be able to detect the immediate leak.

    Incorrect

    Electronic leak detector can able to detect the leak rates of about 0.5 oz per year. Ultra sound leak detector listens to the noise of gas leakage.Fluorescent leak detector detects the leak with the help of dyes. These dyes can cause strains on the equipment and foreign substances in dyes could invalidate the warranty. Also this method cannot be able to detect the immediate leak.

  10. Question 10 of 201 pointsAfter recovering refrigerant from a sealed system, which of the following gas is used to pressurize (for leak checking) or blow debris out of the system:

    Correct

    Nitrogen is colorless, odourless, non inflammable and readily available (economical) gas. It may not cause any acidic formation when reacts with oxygen or moisture which can result in corrosion. CO2 in presence of moisture forms carbonic acid

    Incorrect

    Nitrogen is colorless, odourless, non inflammable and readily available (economical) gas. It may not cause any acidic formation when reacts with oxygen or moisture which can result in corrosion. CO2 in presence of moisture forms carbonic acid

  11. Question 11 of 201 pointsA vacuum test could actually hide a leak:

    Correct

    Vacuum test is not the efficient of leak detection.

    Incorrect

    Vacuum test is not the efficient of leak detection.

  12. Question 12 of 201 pointsDuring each vacuum decay test, it is observed that after creating the vacuum, the pressure of the system increases to greater than 0 psig and stops at some point, Then:

    Correct

    If system has leak, the pressure increases to 0 psig (atmospheric pressure) and stops. If the pressure is greater than 0 psig and stops at some point means refrigerant or water is still evaporating in the system.

    Incorrect

    If system has leak, the pressure increases to 0 psig (atmospheric pressure) and stops. If the pressure is greater than 0 psig and stops at some point means refrigerant or water is still evaporating in the system.

  13. Question 13 of 201 pointsIt is to be ensured that the refrigerant recovery cylinder is not filled to more than _____ of its capacity

    Correct

    If it is filled beyond 80% during increase in temperature the refrigerant expands results in increase in pressure inside the cylinder which can lead to bursting of cylinder

    Incorrect

    If it is filled beyond 80% during increase in temperature the refrigerant expands results in increase in pressure inside the cylinder which can lead to bursting of cylinder

  14. Question 14 of 201 pointsRefrigerant cannot be called reclaimed unless it  meets the ______ purity standard:
  15. Question 15 of 201 pointsEPA has divided refrigerated appliances into _____ groups

    Correct

    1. Small appliances (Type I)
    2. Low pressure appliances (Type III)
    3. Medium Pressure appliances (Type II)
    4. High pressure appliance (Type II)
    5. Very high pressure appliances (Type II)

    Incorrect

    1. Small appliances (Type I)
    2. Low pressure appliances (Type III)
    3. Medium Pressure appliances (Type II)
    4. High pressure appliance (Type II)
    5. Very high pressure appliances (Type II)
  16. Question 16 of 201 pointsOnly _____ refrigerant can be transferred or sold to another individual

    Correct

    Reclaimed refrigerant shall meet ARI 700 purity standard

    Incorrect

    Reclaimed refrigerant shall meet ARI 700 purity standard

  17. Question 17 of 201 pointsRecovered refrigerant is stored in which of the following painted tank:
  18. Question 18 of 201 pointsWhich of the following substance present in refrigerant appliance results in corrosion:
  19. Question 19 of 201 pointsIf your recovery unit does not have a sub-cooling feature recovery rate will be _____ :

    Correct

    Recovery unit with sub-cooling feature accelerates the rate of recovery as it lowers the temperature of the recovery tank

    Incorrect

    Recovery unit with sub-cooling feature accelerates the rate of recovery as it lowers the temperature of the recovery tank

  20. Question 20 of 201 pointsA recovery cylinder can maximum store _____ number of refrigerants:

    Correct

    In recovery cylinder refrigerants shall not be mixed

    Incorrect

    In recovery cylinder refrigerants shall not be mixed

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