Ball valves on the end of refrigeration hoses:
A) Automatically open and close when the hoses are connected and disconnected.
B) Only work when connected to a unit with ball valves.
C) Are controlled manually by the technician.
D) Are electronically controlled by a digital gauge set.
Question 2
Check valves on the end of refrigeration hoses:
A) Are electronically controlled by a digital gauge set.
B) Only work when connected to a unit with Schrader valves.
C) Are controlled manually by the technician.
D) Automatically open and close when the hoses are connected and disconnected.
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