IMSA TRAFFIC SIGNAL TECHNICIAN 2
EXAM Q&A (VERIFIED ANSWERS)
2025/2026
, 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? - ANSWERS1
On a 2070 MMU monitor unit, how does the field tech program allowable phases? -
ANSWERSRemove diode on program card for allowable phases
On an MMU, is it possible to tape the reset button to prevent the traffic signal from going
into flash? - ANSWERSYes, it by-passes the conflict feature and will not flash
On a NEMA CMU program card, how does the signal tech program allowable phases? -
ANSWERSInstall copper jumpers and soldering them on the program card
According to best maintenance practices, how often should CMU/MMU be tested? -
ANSWERSAnnually
The MMU indicates a RED-FAIL fault on phase 6. Why? - ANSWERSThe load
switch/switch pack produces no outputs.
The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the
CMU/MMU to
monitor the - ANSWERSController health
When a Technician is recertifying the CMU/MMU at an intersection, what should the
technician do to have the intersection exit flash? - ANSWERSReplace the CMU/MMU
with a newly tested unit
Absence of all colors on a load switch will be indicated by what fault on an MMU or
MMU2? - ANSWERSRed Fail
Which of the following can be programmed on an MMU to latch after a fault occurs? -
ANSWERSField check
How often is an MMU's clock updated from the controller? - ANSWERSOnce a second
In a signal cabinet, on the signal monitor, what does a field check indicate? -
ANSWERSThe signal indications don't match the controller output for a phase
A NEMA CMU/MMU uses a program card to tell the monitor which phases are permitted
to run together. Which answer is CORRECT? - ANSWERSNEMA monitors have wire
EXAM Q&A (VERIFIED ANSWERS)
2025/2026
, 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? - ANSWERS1
On a 2070 MMU monitor unit, how does the field tech program allowable phases? -
ANSWERSRemove diode on program card for allowable phases
On an MMU, is it possible to tape the reset button to prevent the traffic signal from going
into flash? - ANSWERSYes, it by-passes the conflict feature and will not flash
On a NEMA CMU program card, how does the signal tech program allowable phases? -
ANSWERSInstall copper jumpers and soldering them on the program card
According to best maintenance practices, how often should CMU/MMU be tested? -
ANSWERSAnnually
The MMU indicates a RED-FAIL fault on phase 6. Why? - ANSWERSThe load
switch/switch pack produces no outputs.
The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the
CMU/MMU to
monitor the - ANSWERSController health
When a Technician is recertifying the CMU/MMU at an intersection, what should the
technician do to have the intersection exit flash? - ANSWERSReplace the CMU/MMU
with a newly tested unit
Absence of all colors on a load switch will be indicated by what fault on an MMU or
MMU2? - ANSWERSRed Fail
Which of the following can be programmed on an MMU to latch after a fault occurs? -
ANSWERSField check
How often is an MMU's clock updated from the controller? - ANSWERSOnce a second
In a signal cabinet, on the signal monitor, what does a field check indicate? -
ANSWERSThe signal indications don't match the controller output for a phase
A NEMA CMU/MMU uses a program card to tell the monitor which phases are permitted
to run together. Which answer is CORRECT? - ANSWERSNEMA monitors have wire
