MACS 609 CERTIFICATION
ACTUAL EXAM LATEST UPDATE
Which type of mobile A/C system will usually require additional time / precautions to extract all
the refrigerant? - answer- Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as
low as: - answer- 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? - answer- Generally, very little,
if any
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 in the system in an attempt to check for leaks and HFC-134a is present
,Why is it necessary to insure that service port caps containing good seals are installed? -
answer- To minimize refrigerant loss
Local Area Network (LAN) - answer- A network that covers a relatively small area such as a
building or group of buildings
(1.1 & 2.7)
PRL (Preferred Roaming List) - answer- - Allows phone to connect to the right tower
(1.4)
Port 20/21 - answer- FTP (File Transfer Protocol)
- 20(TCP) for Data Transfers
- 21(TCP) to Control Data Transfers
(2.1)
Port 22 - answer- SSH (Secure Shell) - TCP
- Encrypted Communication
- Looks/Acts the same as Telnet
(2.1)
Port 23 - answer- Telnet (Telecommunications Network) - TCP
- Non-encrypted Communication
- Log into devices remotely
(2.1)
,Port 25 - answer- SMTP (Simple Mail Transfer Protocol) - TCP
- Used to send mail from device to mail server
(2.1)
Port 53 - answer- DNS (Domain Name System) - UDP
- Converts names to IP addresses
- CRITICAL Resource
(2.1)
Port 67/68 - answer- DHCP (Dynamic Host Configuration Protocol) - UDP
- Automated configuration of IP addresses
- IPs can be reserved for certain devices
- IP Range: 10.1.10.10 through 10.1.10.199
(2.1)
Port 80 - answer- HTTP (Hypertext Transfer Protocol) - TCP
- Non-encrypted communication in the browser
(2.1)
Port 110 - answer- POP3 (Post Office Protocol 3) - TCP
- Receive emails from an email server
- Basic mail transfer functionality
(2.1)
Port 143 - answer- IMAP (Internet Mail Access Protocol) - TCP
, - Includes management of email inboxes from multiple clients. (Sync email across multiple
devices)
(2.1)
Port 161/162 - answer- SNMP (Simple Network Management Protocol) - UDP
- Port 161 queries devices for performance statistics.
- Port 162 monitors when metrics exceed a certain threshold.
(2.1)
Port 389 - answer- LDAP (Lightweight Directory Access Protocol) - TCP
- Store & retrieve info in a network directory.
- Commonly used in Microsoft Active Directory.
(2.1)
Personal Area Network (PAN) - answer- - Provides communication for devices owned by a
single user that work over a short distance
- Bluetooth, IR, NFC, etc.
(1.1 & 2.7)
LCD (Liquid Crystal Display) - answer- Lightweight & Inexpensive - Poor black levels due to
Separate Backlight
(1.2)
TN (twisted nematic) - answer- Fast response Times - Low cost - Low Power Use - Limited
Viewing Angles
(1.2)
ACTUAL EXAM LATEST UPDATE
Which type of mobile A/C system will usually require additional time / precautions to extract all
the refrigerant? - answer- Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as
low as: - answer- 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? - answer- Generally, very little,
if any
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 in the system in an attempt to check for leaks and HFC-134a is present
,Why is it necessary to insure that service port caps containing good seals are installed? -
answer- To minimize refrigerant loss
Local Area Network (LAN) - answer- A network that covers a relatively small area such as a
building or group of buildings
(1.1 & 2.7)
PRL (Preferred Roaming List) - answer- - Allows phone to connect to the right tower
(1.4)
Port 20/21 - answer- FTP (File Transfer Protocol)
- 20(TCP) for Data Transfers
- 21(TCP) to Control Data Transfers
(2.1)
Port 22 - answer- SSH (Secure Shell) - TCP
- Encrypted Communication
- Looks/Acts the same as Telnet
(2.1)
Port 23 - answer- Telnet (Telecommunications Network) - TCP
- Non-encrypted Communication
- Log into devices remotely
(2.1)
,Port 25 - answer- SMTP (Simple Mail Transfer Protocol) - TCP
- Used to send mail from device to mail server
(2.1)
Port 53 - answer- DNS (Domain Name System) - UDP
- Converts names to IP addresses
- CRITICAL Resource
(2.1)
Port 67/68 - answer- DHCP (Dynamic Host Configuration Protocol) - UDP
- Automated configuration of IP addresses
- IPs can be reserved for certain devices
- IP Range: 10.1.10.10 through 10.1.10.199
(2.1)
Port 80 - answer- HTTP (Hypertext Transfer Protocol) - TCP
- Non-encrypted communication in the browser
(2.1)
Port 110 - answer- POP3 (Post Office Protocol 3) - TCP
- Receive emails from an email server
- Basic mail transfer functionality
(2.1)
Port 143 - answer- IMAP (Internet Mail Access Protocol) - TCP
, - Includes management of email inboxes from multiple clients. (Sync email across multiple
devices)
(2.1)
Port 161/162 - answer- SNMP (Simple Network Management Protocol) - UDP
- Port 161 queries devices for performance statistics.
- Port 162 monitors when metrics exceed a certain threshold.
(2.1)
Port 389 - answer- LDAP (Lightweight Directory Access Protocol) - TCP
- Store & retrieve info in a network directory.
- Commonly used in Microsoft Active Directory.
(2.1)
Personal Area Network (PAN) - answer- - Provides communication for devices owned by a
single user that work over a short distance
- Bluetooth, IR, NFC, etc.
(1.1 & 2.7)
LCD (Liquid Crystal Display) - answer- Lightweight & Inexpensive - Poor black levels due to
Separate Backlight
(1.2)
TN (twisted nematic) - answer- Fast response Times - Low cost - Low Power Use - Limited
Viewing Angles
(1.2)
