MACS 609 CERTIFICATION EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS,
ALREADY GRADED A+
When recovery/recycling equipment is used to remove
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation? - ANSWER-Generally,
very little, if any
Why is it necessary to insure that service port caps containing
good seals are installed? - ANSWER-To minimize refrigerant
loss
Which of the following statements is correct about flushing
A/C systems? - ANSWER-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing the first recovery process, how long must
you wait, then check the machine's gauges for a rise in
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, pressure above vacuum, which would indicate that the
system still contains some refrigerant? - ANSWER-5
minutes
Which type of tank must be used during the transfer of
refrigerant? - ANSWER-Question 10 options:
Tanks marked DOT 4BA
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant? -
ANSWER-Re-install lubricant removed by the recovery
equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? - ANSWER-Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile
air conditioning system? - ANSWER-If shop air is used
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CORRECT VERIFIED ANSWERS,
ALREADY GRADED A+
When recovery/recycling equipment is used to remove
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation? - ANSWER-Generally,
very little, if any
Why is it necessary to insure that service port caps containing
good seals are installed? - ANSWER-To minimize refrigerant
loss
Which of the following statements is correct about flushing
A/C systems? - ANSWER-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing the first recovery process, how long must
you wait, then check the machine's gauges for a rise in
Page | 1
, pressure above vacuum, which would indicate that the
system still contains some refrigerant? - ANSWER-5
minutes
Which type of tank must be used during the transfer of
refrigerant? - ANSWER-Question 10 options:
Tanks marked DOT 4BA
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant? -
ANSWER-Re-install lubricant removed by the recovery
equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? - ANSWER-Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile
air conditioning system? - ANSWER-If shop air is used
Page | 2
