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EPA 608 Free Practice Test: Core exam 14
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Question 1 of 15
1. Question
1 pointsAfter recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may not be legally vented
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Question 2 of 15
2. Question
1 pointsWhich of the following is highly stable at lower atmosphere:
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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 3 of 15
3. Question
1 pointsA Zeotrope refrigerant mixture will not have temperature glide:
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Zeotrope mixture refrigerant blend consists of mixture of different refrigerants with different vapor pressures
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Zeotrope mixture refrigerant blend consists of mixture of different refrigerants with different vapor pressures
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Question 4 of 15
4. Question
1 pointsMontreal Protocol regulates the production and use of which of the following:
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Montreal Protocol regulates the production and use of CFCs, HCFCs, Halons, Methyl Chloroform and Carbon Tetrachloride.
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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 pointsWhen virgin supplies of CFC’s are depleted, future supplies will come from ______ refrigerants:
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Question 6 of 15
6. Question
1 pointsThe stratospheric layer above the earth’s surface contains _____ ozone gas
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Question 7 of 15
7. Question
1 pointsThe instability of the ozone molecule allows free oxygen atoms to react easily with which of the following:
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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 8 of 15
8. Question
1 pointsMeasuring a systems vacuum should be done with the system isolated:
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Question 9 of 15
9. Question
1 pointsIn order to determine the general area of a leak which of the following is used:
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Question 10 of 15
10. Question
1 pointsVolcanoes contribute large quantity of Chlorine as compared to CFC’s however it is dissolves with water and comes down with rain:
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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 11 of 15
11. Question
1 pointsA two-stage vacuum pump is necessary to pull the deep vacuums generally below:
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Question 12 of 15
12. Question
1 pointsThe piping connection to the vacuum pump should be as short a length as possible
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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 13 of 15
13. Question
1 pointsBadly contaminated and mixed refrigerants in cylinder must be:
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Badly contaminated refrigerant shall be destroyed at an EPA approved reclaimed facility for a substantial fee.
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Badly contaminated refrigerant shall be destroyed at an EPA approved reclaimed facility for a substantial fee.
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Question 14 of 15
14. Question
1 pointsThe oils used in most R-134A refrigeration systems are ESTERS
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Question 15 of 15
15. Question
1 pointsAsphyxia is the lack of ________:
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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.