I M S A · I N T E R N AT I O N A L M U N I C I PA L S I G N A L A S S O C I AT I O N
Traffic Signal Technician Certification
Level II Advanced Q-Bank
Complete Question Bank
Question 1
In a TS2 cabinet, how many times can the MMU experience a "Port 1 Fail" in a 24 hour period
before the fault is latched?
A. 1
CORRECT ANSWER: 1
RATIONALE:
In a TS2 cabinet, a Port 1 Fail fault is latched after a single occurrence within a 24-hour period, requiring
manual reset.
Question 2
On a 2070 MMU monitor unit, how does the field tech program allowable phases?
A. Remove diode on program card for allowable phases
CORRECT ANSWER: Remove diode on program card for allowable phases
RATIONALE:
On a 2070 MMU, allowable phases are programmed by removing diodes on the program card, which
defines compatible phase pairs.
Question 3
On an MMU, is it possible to tape the reset button to prevent the traffic signal from going into
flash?
A. Yes, it by-passes the conflict feature and will not flash
CORRECT ANSWER: Yes, it by-passes the conflict feature and will not flash
RATIONALE:
Taping the reset button bypasses the conflict monitor function, preventing the signal from going into
flash, though this is not a recommended practice.
, Question 4
On a NEMA CMU program card, how does the signal tech program allowable phases?
A. Install copper jumpers and soldering them on the program card
CORRECT ANSWER: Install copper jumpers and soldering them on the program card
RATIONALE:
NEMA CMU program cards use copper jumpers soldered onto the card to define compatible phase pairs.
Question 5
According to best maintenance practices, how often should CMU/MMU be tested?
A. Annually
CORRECT ANSWER: Annually
RATIONALE:
Best practices recommend testing CMU/MMU units annually to ensure proper conflict monitoring and
fail-safe operation.
Question 6
The MMU indicates a RED-FAIL fault on phase 6. Why?
A. The load switch/switch pack produces no outputs.
CORRECT ANSWER: The load switch/switch pack produces no outputs.
RATIONALE:
A RED-FAIL fault indicates the load switch is not producing any output, meaning the phase is dark or
stuck in an invalid state.
Question 7
The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the
CMU/MMU to monitor the
A. Controller health
CORRECT ANSWER: Controller health
RATIONALE:
The CVM output allows the monitor to verify that the controller is powered and functioning properly.
, Question 8
When a Technician is recertifying the CMU/MMU at an intersection, what should the technician
do to have the intersection exit flash?
A. Replace the CMU/MMU with a newly tested unit
CORRECT ANSWER: Replace the CMU/MMU with a newly tested unit
RATIONALE:
To exit flash during recertification, the technician installs a newly tested CMU/MMU to ensure proper
operation.
Question 9
Absence of all colors on a load switch will be indicated by what fault on an MMU or MMU2?
A. Red Fail
CORRECT ANSWER: Red Fail
RATIONALE:
Absence of all colors on a load switch is reported as a Red Fail fault, indicating no output from the load
switch.
Question 10
Which of the following can be programmed on an MMU to latch after a fault occurs?
A. Field check
CORRECT ANSWER: Field check
RATIONALE:
Field check is a programmable feature on an MMU that can be set to latch after a fault occurs, requiring
manual reset.
Question 11
How often is an MMU's clock updated from the controller?
A. Once a second
CORRECT ANSWER: Once a second
RATIONALE:
The MMU receives clock updates from the controller once per second to maintain synchronization.
Traffic Signal Technician Certification
Level II Advanced Q-Bank
Complete Question Bank
Question 1
In a TS2 cabinet, how many times can the MMU experience a "Port 1 Fail" in a 24 hour period
before the fault is latched?
A. 1
CORRECT ANSWER: 1
RATIONALE:
In a TS2 cabinet, a Port 1 Fail fault is latched after a single occurrence within a 24-hour period, requiring
manual reset.
Question 2
On a 2070 MMU monitor unit, how does the field tech program allowable phases?
A. Remove diode on program card for allowable phases
CORRECT ANSWER: Remove diode on program card for allowable phases
RATIONALE:
On a 2070 MMU, allowable phases are programmed by removing diodes on the program card, which
defines compatible phase pairs.
Question 3
On an MMU, is it possible to tape the reset button to prevent the traffic signal from going into
flash?
A. Yes, it by-passes the conflict feature and will not flash
CORRECT ANSWER: Yes, it by-passes the conflict feature and will not flash
RATIONALE:
Taping the reset button bypasses the conflict monitor function, preventing the signal from going into
flash, though this is not a recommended practice.
, Question 4
On a NEMA CMU program card, how does the signal tech program allowable phases?
A. Install copper jumpers and soldering them on the program card
CORRECT ANSWER: Install copper jumpers and soldering them on the program card
RATIONALE:
NEMA CMU program cards use copper jumpers soldered onto the card to define compatible phase pairs.
Question 5
According to best maintenance practices, how often should CMU/MMU be tested?
A. Annually
CORRECT ANSWER: Annually
RATIONALE:
Best practices recommend testing CMU/MMU units annually to ensure proper conflict monitoring and
fail-safe operation.
Question 6
The MMU indicates a RED-FAIL fault on phase 6. Why?
A. The load switch/switch pack produces no outputs.
CORRECT ANSWER: The load switch/switch pack produces no outputs.
RATIONALE:
A RED-FAIL fault indicates the load switch is not producing any output, meaning the phase is dark or
stuck in an invalid state.
Question 7
The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the
CMU/MMU to monitor the
A. Controller health
CORRECT ANSWER: Controller health
RATIONALE:
The CVM output allows the monitor to verify that the controller is powered and functioning properly.
, Question 8
When a Technician is recertifying the CMU/MMU at an intersection, what should the technician
do to have the intersection exit flash?
A. Replace the CMU/MMU with a newly tested unit
CORRECT ANSWER: Replace the CMU/MMU with a newly tested unit
RATIONALE:
To exit flash during recertification, the technician installs a newly tested CMU/MMU to ensure proper
operation.
Question 9
Absence of all colors on a load switch will be indicated by what fault on an MMU or MMU2?
A. Red Fail
CORRECT ANSWER: Red Fail
RATIONALE:
Absence of all colors on a load switch is reported as a Red Fail fault, indicating no output from the load
switch.
Question 10
Which of the following can be programmed on an MMU to latch after a fault occurs?
A. Field check
CORRECT ANSWER: Field check
RATIONALE:
Field check is a programmable feature on an MMU that can be set to latch after a fault occurs, requiring
manual reset.
Question 11
How often is an MMU's clock updated from the controller?
A. Once a second
CORRECT ANSWER: Once a second
RATIONALE:
The MMU receives clock updates from the controller once per second to maintain synchronization.
