FREE AND STUDY GAMES ABOUT CFC TYPE 2 2 EXAM

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FREE AND STUDY GAMES ABOUT CFC TYPE 2 #2 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -25 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: After installation of a field-piped R-410A split heat pump, the unit should first be

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pressurized with nitrogen, then leak checked Question 2: Manifold gauge set hoses should have self-sealing connectors or hand valves to

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minimize the release of refrigerant when the hoses are connected and disconnected Question 3: To change the compressor on a system containing R-410A, you must isolate the compressor and then

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evacuate the isolated section of the system to atmospheric pressure and hold. If the system pressure does not rise, remove the compressor.Question 4: A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because

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the motor needs the flow of refrigerant through the compressor to provide motor cooling.

Question 5: After reaching the required recovery vacuum on a system you must

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wait to see if the system pressure rises indicating that there is still refrigerant in liquid form or refrigerant trapped in the oil.Question 6: When using recovery or recycling equipment that was manufactured AFTER November 15 1993, you must evacuate a system containing MORE than 200 pounds of CFC-12 to _______ before making a major repair.

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15 inches of Hg vacuum

Question 7: Heat pumps that use R-410A should be leak checked with

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pressurized nitrogen Question 8: Never use oxygen or compressed air to leak check equipment because R-410A can

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explode when mixed with air or oxygen Question 9: The proper charging method for blended (non-azeotropic) refrigerants (400 series) is to remove the charge from the cylinder as a

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liquid Question 10: . To change the compressor on a system containing 40 pounds of R-500 using a recycling machine that was manufactured AFTER November 15 1993, you must isolate the compressor then

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evacuate the isolated section of the system to 10 inches of vacuum and hold. If system pressure does not rise, remove the compressor.Question 11: R-410A requires a high-pressure manifold gauge and hose set. They must have a

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4000 psig burst pressure and a 800 psig working pressure.

Question 12: When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _____ before switching to liquid charging.

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35 psig

Question 13: Pressure relief valves must not be

.

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installed in series Question 14: The method to charge a system that has a normal charge of 80 pounds is to charge with

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liquid through the liquid line service valve Question 15: R-410A is different from other ASHRAE 400 series non-azeotropic blends because

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R-410A behaves as a near azeotropic refrigerant and can be topped off.Question 16: Every air conditioning or refrigeration system should be protected by a

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pressure relief device.Question 17: With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur

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from the liquid line entering the evaporator Question 18: Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before your recovery unit can be used to recover R-410A?

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recovery unit must be EPA-certified for use with R-410A.The recovery tank must be designed for the pressure of R-410A.The filter and lubricant in the recovery unit must be changed and the recovery unit evacuated.

Question 19: When inspecting a system for leaks, you should look for

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traces of oil.Question 20: In a refrigeration system, the component directly following the evaporator is the

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accumulator Question 21: The refrigerant pressure inside an R-410A unit which is at room temperature (72F) and not operating is

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approximately 210 psig.Question 22: Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation method. However, it

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can be dangerous if not used with a pressure regulator.

Question 23: When a new system has been assembled, the first thing to do is

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pressurize the system with an inert gas and leak check.Question 24: Heat pumps that have been retrofitted from R-22 to R-407C should be leak checked with

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pressurized nitrogen

Question 25: A reciprocating compressor should not be energized while

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the discharge service valve is closed