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EPA 608 Free Practice Test: Core exam 14
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Question 1 of 15
1. Question
1 pointsThe oils used in most R-134A refrigeration systems are ESTERS
Correct
Incorrect
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Question 2 of 15
2. Question
1 pointsThe piping connection to the vacuum pump should be as short a length as possible
Correct
This is to avoid excess pressure drop in the lines and improve the recovery rate
Incorrect
This is to avoid excess pressure drop in the lines and improve the recovery rate
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Question 3 of 15
3. Question
1 pointsVolcanoes contribute large quantity of Chlorine as compared to CFC’s however it is dissolves with water and comes down with rain:
Correct
Natural Sources contributes only 18% of the chlorine in the stratosphere. Remaining 72% is contributed by man made sources. Chlorine associated with natural sources generally dissolve in water / moisture and falls down unlike CFCs & HCFCs
Incorrect
Natural Sources contributes only 18% of the chlorine in the stratosphere. Remaining 72% is contributed by man made sources. Chlorine associated with natural sources generally dissolve in water / moisture and falls down unlike CFCs & HCFCs
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Question 4 of 15
4. Question
1 pointsMontreal Protocol regulates the production and use of which of the following:
Correct
Montreal Protocol regulates the production and use of CFCs, HCFCs, Halons, Methyl Chloroform and Carbon Tetrachloride.
Incorrect
Montreal Protocol regulates the production and use of CFCs, HCFCs, Halons, Methyl Chloroform and Carbon Tetrachloride.
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Question 5 of 15
5. Question
1 pointsA Zeotrope refrigerant mixture will not have temperature glide:
Correct
Zeotrope mixture refrigerant blend consists of mixture of different refrigerants with different vapor pressures
Incorrect
Zeotrope mixture refrigerant blend consists of mixture of different refrigerants with different vapor pressures
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Question 6 of 15
6. Question
1 pointsWhen virgin supplies of CFC’s are depleted, future supplies will come from ______ refrigerants:
Correct
Incorrect
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Question 7 of 15
7. Question
1 pointsBadly contaminated and mixed refrigerants in cylinder must be:
Correct
Badly contaminated refrigerant shall be destroyed at an EPA approved reclaimed facility for a substantial fee.
Incorrect
Badly contaminated refrigerant shall be destroyed at an EPA approved reclaimed facility for a substantial fee.
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Question 8 of 15
8. Question
1 pointsAsphyxia is the lack of ________:
Correct
Molecular weight of Refrigerants are higher than oxygen. Therefore they are heavier than air and can displace oxygen in closed rooms when leaked from equipment. This causes Asphyxia – meaning lack of oxygen and may cause headache, dizziness, unconsciousness and even death.
Incorrect
Molecular weight of Refrigerants are higher than oxygen. Therefore they are heavier than air and can displace oxygen in closed rooms when leaked from equipment. This causes Asphyxia – meaning lack of oxygen and may cause headache, dizziness, unconsciousness and even death.
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Question 9 of 15
9. Question
1 pointsAfter recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may not be legally vented
Correct
Incorrect
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Question 10 of 15
10. Question
1 pointsIn order to determine the general area of a leak which of the following is used:
Correct
Incorrect
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Question 11 of 15
11. Question
1 pointsThe instability of the ozone molecule allows free oxygen atoms to react easily with which of the following:
Correct
The ozone molecule containing three oxygen atoms is unstable and can react with Chlorine, Bromine, Nitrogen & Hydrogen
Incorrect
The ozone molecule containing three oxygen atoms is unstable and can react with Chlorine, Bromine, Nitrogen & Hydrogen
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Question 12 of 15
12. Question
1 pointsMeasuring a systems vacuum should be done with the system isolated:
Correct
Incorrect
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Question 13 of 15
13. Question
1 pointsWhich of the following is highly stable at lower atmosphere:
Correct
CFCs are highly stable at lower atmosphere. Lifetime of CFCs will be in the range of 20 to 100 years. Because of high stability it does not react at lower levels of atmosphere and reaches stratosphere where it reacts with Ozone thus depleting ozone layer.
Incorrect
CFCs are highly stable at lower atmosphere. Lifetime of CFCs will be in the range of 20 to 100 years. Because of high stability it does not react at lower levels of atmosphere and reaches stratosphere where it reacts with Ozone thus depleting ozone layer.
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Question 14 of 15
14. Question
1 pointsThe stratospheric layer above the earth’s surface contains _____ ozone gas
Correct
Incorrect
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Question 15 of 15
15. Question
1 pointsA two-stage vacuum pump is necessary to pull the deep vacuums generally below:
Correct
Incorrect