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EPA 608 Free Online Practice Quiz Questions Answers: Core exam 4
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Question 1 of 20
1. Question
1 pointsStratosphere layer consists of ____ of the available Ozone on the earth’s atmosphere:
Correct
Stratosphere layer consists of about 90% of ozone, which protects earth from harmful sun’s UV radiation.
Incorrect
Stratosphere layer consists of about 90% of ozone, which protects earth from harmful sun’s UV radiation.
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Question 2 of 20
2. Question
1 pointsWhen ozone reacts with chlorine ion which of the following is obtained:
Correct
When chlorine ion reacts with ozone molecule in stratosphere oxygen and chlorine monoxide (clo-)is formed. Chlorine monoxide (clo-) then again reacts with ozone molecule to oxygen and chlorine ion
Incorrect
When chlorine ion reacts with ozone molecule in stratosphere oxygen and chlorine monoxide (clo-)is formed. Chlorine monoxide (clo-) then again reacts with ozone molecule to oxygen and chlorine ion
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Question 3 of 20
3. Question
1 pointsWhich one of the following has minimal ozone depletion potential:
Correct
Chlorine ion at stratosphere is responsible for depletion of ozone molecules at stratosphere. HFC refrigerants do not have chlorine ions. Therefore HFCs have minimum ozone depletion potential. However HFC refrigerants are green house gases and contributes to global warming
Incorrect
Chlorine ion at stratosphere is responsible for depletion of ozone molecules at stratosphere. HFC refrigerants do not have chlorine ions. Therefore HFCs have minimum ozone depletion potential. However HFC refrigerants are green house gases and contributes to global warming
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Question 4 of 20
4. Question
1 pointsOnly CFCs and HCFCs refrigerants are to be mandatorily recovered:
Correct
all refrigerants must be recovered not only CFCs and HCFCs
Incorrect
all refrigerants must be recovered not only CFCs and HCFCs
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Question 5 of 20
5. Question
1 pointsAll Refrigerant Oils are Hygroscopic:
Correct
All synthetic oils are hydroscopic (readily absorbs moisture) but not mineral oils.
Incorrect
All synthetic oils are hydroscopic (readily absorbs moisture) but not mineral oils.
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Question 6 of 20
6. Question
1 pointsDisposable cylinders are used only for which of the following refrigerant:
Correct
Disposable cylinders are used for virgin refrigerant & reclaimed refrigerants only
Incorrect
Disposable cylinders are used for virgin refrigerant & reclaimed refrigerants only
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Question 7 of 20
7. Question
1 pointsIf icing occurs on the sight glass, which of the following is used to remove the ice:
Correct
Incorrect
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Question 8 of 20
8. Question
1 pointsWhich of the following when mixed with refrigerants cannot cause an explosion:
Correct
Nitrogen gas temperature changes very little when pressurized.
Incorrect
Nitrogen gas temperature changes very little when pressurized.
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Question 9 of 20
9. Question
1 pointsWhich of the following is formed when refrigerants exposed to flames or steam which is poisonous:
Correct
Incorrect
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Question 10 of 20
10. Question
1 pointsFor obtaining the most accurate readings during evacuation process, the vacuum gauge should be located as ____ as possible from the vacuum pump:
Correct
Longer the distance higher the pressure drop
Incorrect
Longer the distance higher the pressure drop
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Question 11 of 20
11. Question
1 pointsThe warmer the temperature of the refrigeration system, the slower it will evacuate:
Correct
Warmer the refrigeration system, refrigeration vapour will be warmer and more denser. Therefore the compressor in the recovery system transfer more refrigerant per minute
Incorrect
Warmer the refrigeration system, refrigeration vapour will be warmer and more denser. Therefore the compressor in the recovery system transfer more refrigerant per minute
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Question 12 of 20
12. Question
1 pointsWhen evacuation of the refrigerant, larger the diameter of the suction hoses, _____ will be recovery rate of the refrigerant:
Correct
Larger the diameter of suction hose, lower will be the pressure drop and faster will be the recovery rate
Incorrect
Larger the diameter of suction hose, lower will be the pressure drop and faster will be the recovery rate
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Question 13 of 20
13. Question
1 pointsMixed refrigerants in the same tank may be impossible to reclaim:
Correct
If reclaimation facility receives the mixed refrigerant, it may refuse the process the refrigerant and returns back to owner or destroys the refrigerant with fee.
Incorrect
If reclaimation facility receives the mixed refrigerant, it may refuse the process the refrigerant and returns back to owner or destroys the refrigerant with fee.
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Question 14 of 20
14. Question
1 pointsSchrader valves are present on which of the following:
Correct
If reclaimation facility receives the mixed refrigerant, it may refuse the process the refrigerant and returns back to owner or destroys the refrigerant with fee.
Incorrect
If reclaimation facility receives the mixed refrigerant, it may refuse the process the refrigerant and returns back to owner or destroys the refrigerant with fee.
-
Question 15 of 20
15. Question
1 pointsWhen checking for small leaks, using a ____ is the most effective method:
Correct
Incorrect
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Question 16 of 20
16. Question
1 pointsOil is used in compressor for which of the following purpose:
Correct
Incorrect
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Question 17 of 20
17. Question
1 pointsRefrigerant in Discharge Line will be in which of the following phase:
Correct
Discharge line connects the compressor to the inlet of condenser. As compressor compresses the refrigerant, it will be in hot high pressure vapour phase
Incorrect
Discharge line connects the compressor to the inlet of condenser. As compressor compresses the refrigerant, it will be in hot high pressure vapour phase
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Question 18 of 20
18. Question
1 pointsWhich of the following refrigerant is used in medium pressure appliance:
Correct
R-11- Low pressure appliance
R-500- Medium pressure appliance
R-503- Very high pressure appliance
R-410A – High pressure applianceIncorrect
R-11- Low pressure appliance
R-500- Medium pressure appliance
R-503- Very high pressure appliance
R-410A – High pressure appliance -
Question 19 of 20
19. Question
1 pointsThe center port of the service manifold is usually have ______ hose:
Correct
Service manifold consists of 3hoses. Blue hose is for low pressure side, Red hose is for high pressure hose and yellow hose (center) is for service (add or remove refrigerant or remove contaminants from the system)
Incorrect
Service manifold consists of 3hoses. Blue hose is for low pressure side, Red hose is for high pressure hose and yellow hose (center) is for service (add or remove refrigerant or remove contaminants from the system)
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Question 20 of 20
20. Question
1 pointsWhich of the following device takes the low pressure, low temperature refrigerant vapor and changes it to a high-temperature, high-pressure, superheated refrigerant vapor:
Correct
Incorrect