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EPA 608 Core test quiz exam 12
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Question 1 of 15
1. Question
1 pointsA bounty of up to ________ will be awarded for a person who gives details of intentional venting of refrigerants to atmosphere:
Correct
Incorrect
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Question 2 of 15
2. Question
1 pointsRecovery cylinders have how many port(s)
Correct
Incorrect
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Question 3 of 15
3. Question
1 pointsRefillable cylinders which are at high pressure under ambient temperature must be hydrostatically tested and date stamped every ______ years:
Correct
Reusable cylinders must have Department of Transportation (DOT) stamp of approval
Incorrect
Reusable cylinders must have Department of Transportation (DOT) stamp of approval
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Question 4 of 15
4. Question
1 pointsIf moisture is allowed to remain in an operating refrigeration system which of the following is formed:
Correct
At higher temperature refrigerant reacts with water /moisture to form acids
Incorrect
At higher temperature refrigerant reacts with water /moisture to form acids
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Question 5 of 15
5. Question
1 pointsStratosphere is located between ______ above the sea level
Correct
Stratosphere is located at lower part of Earth’s atmosphere above Troposphere. Troposphere extends from Earth’s surface to 10 miles. Stratosphere extends from 10 miles to 30 miles above Earth;s atmosphere
Incorrect
Stratosphere is located at lower part of Earth’s atmosphere above Troposphere. Troposphere extends from Earth’s surface to 10 miles. Stratosphere extends from 10 miles to 30 miles above Earth;s atmosphere
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Question 6 of 15
6. Question
1 pointsTo ________ is to process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis.
Correct
Reclaimed refrigerant should qualify ARI 700 purity specifications. This can be achieved by passing refrigerant through single or multiple stages of equipment such as filters.
Incorrect
Reclaimed refrigerant should qualify ARI 700 purity specifications. This can be achieved by passing refrigerant through single or multiple stages of equipment such as filters.
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Question 7 of 15
7. Question
1 pointsR-134a is most common replacement for which of the following refrigerant:
Correct
R-134a (HFC) is a possible replacement for R-12 (CFC) in new household refrigerators. R-134a pressure-temperature characteristics similar to R-12. However some modifications such as lubrication, thermal expansion valve, compressor & filter dryer may required to be changed
Incorrect
R-134a (HFC) is a possible replacement for R-12 (CFC) in new household refrigerators. R-134a pressure-temperature characteristics similar to R-12. However some modifications such as lubrication, thermal expansion valve, compressor & filter dryer may required to be changed
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Question 8 of 15
8. Question
1 pointsPressure Relief valves must be installed in which of the following arrangement
Correct
Pressure Relief Valves are installed in parallel such that failure of one valve will not compromise the safety of the cylinder.
Incorrect
Pressure Relief Valves are installed in parallel such that failure of one valve will not compromise the safety of the cylinder.
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Question 9 of 15
9. Question
1 pointsRefrigerants are generally ______ than air:
Correct
Refrigerants are generally heavier than air. In closed rooms when leaked it has the capacity to displace the air (oxygen) leading to Asphyxia phenomenon.
Incorrect
Refrigerants are generally heavier than air. In closed rooms when leaked it has the capacity to displace the air (oxygen) leading to Asphyxia phenomenon.
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Question 10 of 15
10. Question
1 pointsRefrigeration Cylinders should not be transported in an upright position
Correct
Refrigeration cylinders are stored and transported in upright position to keep pressure relief valve in contact with the vapour pressure inside the cylinder not the liquid
Incorrect
Refrigeration cylinders are stored and transported in upright position to keep pressure relief valve in contact with the vapour pressure inside the cylinder not the liquid
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Question 11 of 15
11. Question
1 pointsOzone at Stratosphere protects us from Sun’s harmful _______
Correct
Ozone & oxygen molecules present in the stratosphere absorbs the Sun’s harmful UV radiation.
Incorrect
Ozone & oxygen molecules present in the stratosphere absorbs the Sun’s harmful UV radiation.
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Question 12 of 15
12. Question
1 pointsTechnicians certified under Clean Air Act, Section 609 are allowed to purchase R-12 in containers smaller than ______:
Correct
Incorrect
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Question 13 of 15
13. Question
1 pointsAn azeotrope mixture does not have a temperature glide
Correct
Azeotrope mixture is made up of two or more refrigerants which act as single refrigerant compound over its entire temperature and pressure range. Azeotrope refrigerant mixtures will not have temperature glide (temperature difference between saturated vapour & saturated liquid at constant pressure). Zeotrope & near azeotrope mixtures will have temperature glide.
Incorrect
Azeotrope mixture is made up of two or more refrigerants which act as single refrigerant compound over its entire temperature and pressure range. Azeotrope refrigerant mixtures will not have temperature glide (temperature difference between saturated vapour & saturated liquid at constant pressure). Zeotrope & near azeotrope mixtures will have temperature glide.
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Question 14 of 15
14. Question
1 pointsWhich of the following is used for pinpoint the leak in the refrigeration system:
Correct
Incorrect
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Question 15 of 15
15. Question
1 pointsA ______ drier should be installed to trap any debris that may damage the compressor:
Correct
Incorrect