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R410A CERTIFICATION EXAM
WITH QUESTIONS AND V ERIFIED
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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Question 3: When charging an R410a system that uses a
thermostatic expansion valve, proper charge can be
determined by measuring:
CORRECT ANSWER: Subcooling
Question 4: When charging an R410a system that uses a
capillary tube or a fixed metering device, proper charge
can be determined by measuring:
CORRECT ANSWER: Superheat
Question 5: Compressor internal pressure relief settings
for R410a systems are:
CORRECT ANSWER: 550 psig to 625 psig
Question 6: When handling refrigerants technicians
should:
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CORRECT ANSWER: Wear approved eye protection
and gloves
Question 7: R410a systems use a high pressure switch
that will open at approximately:
CORRECT ANSWER: 610 psig plus or minus 10 psig
Question 8: Subcooled liquid in the receiver may _____
subcooling, depending on surrounding conditions.
CORRECT ANSWER: Lose or gain
Question 9: When installing a liquid line filter drier on a
R410a system, be certain that it has a pressure rating of at
least:
CORRECT ANSWER: 600 psig
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Question 10: The flow area of a R410a metering device
is:
CORRECT ANSWER: Smaller than that of a r22
metering device
Question 11: Which of the following statements is true of
R407C?
CORRECT ANSWER: It may separate (fractionate) into
its component refrigerants
Question 12: A true azeotropic blend:
CORRECT ANSWER: * Will not fractionate
CORRECT ANSWER: * Has no temperature glide
CORRECT ANSWER: * Behaves as a single
component refrigerant