Free EPA 608 Practice Test (Core Exam)-2
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Free Online EPA 608 Practice Test( Core Exam)-2
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Question 1 of 14
1. Question
1 pointsIn a refrigerant system the function of compressor is to change ………………….
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Question 2 of 14
2. Question
1 points……………… refrigerant has highest global warming potential
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Question 3 of 14
3. Question
1 pointsWhich of the refrigerant has no ‘drop-in’ replacement gas?
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Question 4 of 14
4. Question
1 pointsThe temperature difference of refrigerant is across condenser is almost constant.
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Question 5 of 14
5. Question
1 pointsWhich of the following oil used for use with R-22 refrigerant system?
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Question 6 of 14
6. Question
1 pointsCharging a blend refrigerant should be done as a ……………
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Question 7 of 14
7. Question
1 pointsWhich of the following refrigeration system component converts high pressure liquid in to low pressure liquid?
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Question 8 of 14
8. Question
1 pointsWhich of the following compressor should not be operated when there is a vacuum in the system?
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Question 9 of 14
9. Question
1 pointsThe refrigerant storage tanks are painted …………………..
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Question 10 of 14
10. Question
1 pointsHFC’s have no ozone depletion potential because …………………………..
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Question 11 of 14
11. Question
1 pointsEven for small appliances EPA requires to repair leaks with in 10 days.
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Question 12 of 14
12. Question
1 pointsA DOT classification tag should be there on refrigerant cylinder for …………….
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Question 13 of 14
13. Question
1 pointsOzone molecule in stratosphere consists of …………………… atoms.
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Question 14 of 14
14. Question
1 pointsWhat is approximate oxygen percentage in atmosphere?
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EPA 608 Practice Test Note (Core Exam)-2
a) Vacuum Pump used in Passive System
The vacuum pump can be assisted in refrigerant recovery in a passive system with an inoperative compressor. But the refrigerant container should be non-pressurized because vacuum pump can handle pumping against more than atmospheric pressure.
b) Large Vacuum Pump Freezes the moisture in the system.
Using too large vacuum pump will freeze the moisture in the system because it causes the speedy drop in the system pressure. When the pressure drops the boiling point and freezing point of water decreases. To remove the moisture a dry nitrogen should be introduced which increases the pressure in system and melts the moisture in to water which can be removed using liquid recovery procedure.
c) System gauge position in vacuum pulling
In vacuum pulling procedure, the system vacuum gauge should be located as close as possible to system tubing and as far to the vacuum pump. This increases the accuracy in pulling vacuum using vacuum pump. By this method continuous monitoring the system pressure will reduce the effect of moisture freezing.