EPA 608 Core exam: Free Online Practice Test 1
Question 1 of 20
- 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.
- 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.
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.
- 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
- Question 4 of 201 pointsHalons were completely phased out by ______ :
- 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:
- 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
- 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
- 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.
- 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.
- 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
- 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.
- 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.
- 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
- Question 14 of 201 pointsRefrigerant cannot be called reclaimed unless it meets the ______ purity standard:
- Question 15 of 201 pointsEPA has divided refrigerated appliances into _____ groups
Correct
- Small appliances (Type I)
- Low pressure appliances (Type III)
- Medium Pressure appliances (Type II)
- High pressure appliance (Type II)
- Very high pressure appliances (Type II)
Incorrect
- Small appliances (Type I)
- Low pressure appliances (Type III)
- Medium Pressure appliances (Type II)
- High pressure appliance (Type II)
- Very high pressure appliances (Type II)
- 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
- Question 17 of 201 pointsRecovered refrigerant is stored in which of the following painted tank:
- Question 18 of 201 pointsWhich of the following substance present in refrigerant appliance results in corrosion:
- 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
- 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
