Core Question 1 of 20 Most of the Earth's protective ozone is located in which atmospheric layer?
Show answer & explanation Correct answer: The stratosphere
Per the EPA Section 608 Core exam content: The stratosphere
Type I Question 2 of 20 Which is the EPA definition of a SMALL APPLIANCE?
Show answer & explanation Correct answer: A product fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant
Per the EPA Section 608 Type I exam content: A product fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant
Type II Question 3 of 20 Before charging a new system with refrigerant, what should be done?
Show answer & explanation Correct answer: Pressurize with nitrogen (classified as an inert gas) and leak checked.
Per the EPA Section 608 Type II exam content: Pressurize with nitrogen (classified as an inert gas) and leak checked.
Type III Question 4 of 20 A LOW-pressure appliance uses a refrigerant with a boiling point:
Show answer & explanation Correct answer: Above 10°C (50°F) at atmospheric pressure
Per the EPA Section 608 Type III exam content: Above 10°C (50°F) at atmospheric pressure
Core Question 5 of 20 Between CFCs, HCFCs, and HFCs, ozone-depletion potential (ODP) ranks:
Show answer & explanation Correct answer: CFCs highest, then HCFCs, then HFCs (near zero)
Per the EPA Section 608 Core exam content: CFCs highest, then HCFCs, then HFCs (near zero)
Type I Question 6 of 20 An MVAC-like appliance is:
Show answer & explanation Correct answer: An open-drive, mechanical vapor-compression appliance cooling a non-road vehicle cab (excludes units using HCFC-22)
Per the EPA Section 608 Type I exam content: An open-drive, mechanical vapor-compression appliance cooling a non-road vehicle cab (excludes units using HCFC-22)
Type II Question 7 of 20 What tools can you use to find general area of leaks and pinpoint leaks?
Show answer & explanation Correct answer: Electronic or ultrasonic leak detector will provide the general area of the leak
Per the EPA Section 608 Type II exam content: Electronic or ultrasonic leak detector will provide the general area of the leak
Type III Question 8 of 20 Low-pressure systems (large chillers) operate:
Show answer & explanation Correct answer: Below atmospheric pressure (in a vacuum)
Per the EPA Section 608 Type III exam content: Below atmospheric pressure (in a vacuum)
Core Question 9 of 20 A crankcase heater is used to:
Show answer & explanation Correct answer: Keep refrigerant from migrating into and condensing in the compressor oil
Per the EPA Section 608 Core exam content: Keep refrigerant from migrating into and condensing in the compressor oil
Type I Question 10 of 20 If a small-appliance compressor is INOPERATIVE, refrigerant should be recovered from:
Show answer & explanation Correct answer: Both the high-side and low-side access valves
Per the EPA Section 608 Type I exam content: Both the high-side and low-side access valves
Type II Question 11 of 20 Traces of oil around a sight glass inlet fitting of a refrigeration system might be the indication of:
Show answer & explanation Correct answer: A leak
Per the EPA Section 608 Type II exam content: A leak
Type III Question 12 of 20 In a low-pressure system, a leak usually means:
Show answer & explanation Correct answer: Air and moisture leak INTO the system (rather than refrigerant leaking out)
Per the EPA Section 608 Type III exam content: Air and moisture leak INTO the system (rather than refrigerant leaking out)
Core Question 13 of 20 Which technique speeds up refrigerant recovery?
Show answer & explanation Correct answer: Use short, large-diameter hoses to reduce pressure drop
Per the EPA Section 608 Core exam content: Use short, large-diameter hoses to reduce pressure drop
Type I Question 14 of 20 If a small-appliance compressor IS operating, a system-dependent recovery pulls from:
Show answer & explanation Correct answer: A single access valve on the high side
Per the EPA Section 608 Type I exam content: A single access valve on the high side
Type II Question 15 of 20 Type II classification, as identified by EPA, applies to what equipment?
Show answer & explanation Correct answer: Split air conditioning equipment with five (5) pounds of refrigerant or more
Per the EPA Section 608 Type II exam content: Split air conditioning equipment with five (5) pounds of refrigerant or more
Type III Question 16 of 20 Excessive operation of the purge unit on a low-pressure chiller indicates:
Show answer & explanation Correct answer: A leak allowing air/moisture into the system
Per the EPA Section 608 Type III exam content: A leak allowing air/moisture into the system
Core Question 17 of 20 Air, moisture, and other non-condensables in a system are removed by:
Show answer & explanation Correct answer: Evacuating (pulling a vacuum) with a vacuum pump
Per the EPA Section 608 Core exam content: Evacuating (pulling a vacuum) with a vacuum pump
Type I Question 18 of 20 System-dependent (passive) recovery on small appliances uses:
Show answer & explanation Correct answer: The appliance's own compressor or internal pressure to move refrigerant
Per the EPA Section 608 Type I exam content: The appliance's own compressor or internal pressure to move refrigerant
Type II Question 19 of 20 What is the purpose of the filter drier and when should it be changed?
Show answer & explanation Correct answer: To remove moisture from the refrigerant, replace on a routine basis or anytime a system is opened
Per the EPA Section 608 Type II exam content: To remove moisture from the refrigerant, replace on a routine basis or anytime a system is opened
Type III Question 20 of 20 A purge unit removes non-condensables from what part of a low-pressure chiller?
Show answer & explanation Correct answer: The top of the condenser
Per the EPA Section 608 Type III exam content: The top of the condenser