MACS 609 CERTIFICATION EXAM
WITH QUESTIONS AND WELL
VERIFIED ANSWERS[GRADED A+]
If lubricant is removed by recovery equipment during system
... [Show More] refrigerant
removal, what must be done with the lubricant? - ANS✔✔---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? - ANS✔✔---
Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile air conditioning
system? - ANS✔✔---If shop air is used in the system in an attempt to
check for leaks and HFC-134a is present
Which type of mobile A/C system will usually require additional time /
precautions to extract all the refrigerant? - ANS✔✔---Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of
identifying leakage rates as low as: - ANS✔✔---0.15 ounces per year
When recovery/recycling equipment is used to remove refrigerant from a
mobile A/C system, how much lubricant will be removed during the
operation? - ANS✔✔---Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals
are installed? - ANS✔✔---To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems? -
ANS✔✔---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 pressure above vacuum, which would
indicate that the system still contains some refrigerant? - ANS✔✔---5
minutes
Which type of tank must be used during the transfer of refrigerant? -
ANS✔✔---Question 10 options:
Tanks marked DOT 4BA
When it has been determined that an A/C system has a low refrigerant
charge, what should be done? - ANS✔✔---Perform a leak detection
procedure
One effect of some refrigerant gases in the atmosphere is that they: -
ANS✔✔---Contribute to trapping heat
How much moisture is removed from a mobile A/C system during a typical
evacuation? - ANS✔✔---Possibly none
Paid technicians who service or repair mobile A/C systems using HFC-22
as refrigerant, or service cargo refrigeration equipment: - ANS✔✔---Must
be Section 608 Type II certified
Mixing CFC-12 and HFC-134a in the same system will: - ANS✔✔---
Result in refrigerant cross contamination
Section 609 of the Clean Air Act requires that recovery/recycling
equipment: - ANS✔✔---Must be registered with the EPA
What is the advantage of using refrigerant identification equipment? -
ANS✔✔---Allows the ability to determine what type of refrigerant is in
system
HFO-1234yf is classified as "A2L-mildly flammable." This means: -
ANS✔✔---It can ignite under certain circumstances
When performing engine pre-heat for refrigerant removal, the technician
should do ALL of the following [Show Less]