MACS 609 (Mobile Air Conditioning Society)
CERTIFICATION Complete Exam Study Guide
with Detailed Study Questions and Answers |
Latest Edition
1. The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is:
- ANSWER Approved by some vehicle manufactures but not by others
2. One effect of some refrigerant gases in the atmosphere is that they: -
ANSWER Contribute to trapping heat
3. Which item is not mentioned in the SAE J2099 Standard of refrigerant
purity? - ANSWER Sludge
4. When it has been determined that an A/C system has a low refrigerant
charge, what should be done? - ANSWER Perform a leak test procedure
5. Which type of tank must be used during the transfer of refrigerant? -
ANSWER Tanks marked DOT 4BA
6. When can HFC-134a become combustible in a mobile air conditioning
system? - ANSWER If shop air is used in the system in an attempt to check
for leaks and HFC-134a is present
7. Mineral-based lubricants are used in which type of mobile A/C system? -
ANSWER CFC-12
, 8. How much moisture is removed from a mobile A/C system during a typical
evacuation? - ANSWER Possibly none
9. 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
10.Mobile A/C system design changes, new service procedures and equipment
have been developed for what reason? - ANSWER To reduce lifetime
refrigerant emissions
11.Why is it necessary to ensure that service port caps containing good seals are
installed? - ANSWER To minimize refrigerant loss
12.Which of the following is NOT a factor in how much refrigerant can be
recovered from an A/C system? - ANSWER The age of the vehicle
13.The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use
conditions." That means: - ANSWER The refrigerant may only be used in
newly manufactured vehicles with components specifically designed for it
14.HFO-1234yf has been tested and found compatible with: - ANSWER PAG
oil
15.To use an electronic leak detector, how much refrigerant must a system
contain? - ANSWER About 10% to 15% of system charge
16.What was a key design change for HFC-134a A/C systems versus CFC-12
A/C systems? - ANSWER Increased condenser capacity and airflow
CERTIFICATION Complete Exam Study Guide
with Detailed Study Questions and Answers |
Latest Edition
1. The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is:
- ANSWER Approved by some vehicle manufactures but not by others
2. One effect of some refrigerant gases in the atmosphere is that they: -
ANSWER Contribute to trapping heat
3. Which item is not mentioned in the SAE J2099 Standard of refrigerant
purity? - ANSWER Sludge
4. When it has been determined that an A/C system has a low refrigerant
charge, what should be done? - ANSWER Perform a leak test procedure
5. Which type of tank must be used during the transfer of refrigerant? -
ANSWER Tanks marked DOT 4BA
6. When can HFC-134a become combustible in a mobile air conditioning
system? - ANSWER If shop air is used in the system in an attempt to check
for leaks and HFC-134a is present
7. Mineral-based lubricants are used in which type of mobile A/C system? -
ANSWER CFC-12
, 8. How much moisture is removed from a mobile A/C system during a typical
evacuation? - ANSWER Possibly none
9. 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
10.Mobile A/C system design changes, new service procedures and equipment
have been developed for what reason? - ANSWER To reduce lifetime
refrigerant emissions
11.Why is it necessary to ensure that service port caps containing good seals are
installed? - ANSWER To minimize refrigerant loss
12.Which of the following is NOT a factor in how much refrigerant can be
recovered from an A/C system? - ANSWER The age of the vehicle
13.The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use
conditions." That means: - ANSWER The refrigerant may only be used in
newly manufactured vehicles with components specifically designed for it
14.HFO-1234yf has been tested and found compatible with: - ANSWER PAG
oil
15.To use an electronic leak detector, how much refrigerant must a system
contain? - ANSWER About 10% to 15% of system charge
16.What was a key design change for HFC-134a A/C systems versus CFC-12
A/C systems? - ANSWER Increased condenser capacity and airflow
