R410A CERTIFICATION EXAM WITH QUESTIONS AND VERIFIED ANSWERS

R410A CERTIFICATION EXAM WITH QUESTIONS AND VERIFIED ANSWERS
Question 1: Recovery cylinders used with R410 must
have a DOT rating of:
* DOT 4BA 400
* DOT 4BW 400
CORRECT ANSWER: * DOT 4BA 400
CORRECT ANSWER: * DOT 4BW 400
Question 2: A system using R410 refrigerant has bubbles
in the sight glass. Technician A says that the system must
be low on refrigerant. Technician B says that the bubbles
could be caused by the blended refrigerant flashing in the
increased volume of the sightless. Who is right?
CORRECT ANSWER: Technician B only

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