IMSA Traffic Signal Technician 2
UPDATED ACTUAL Exam Questions and
CORRECT Answers
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? - CORRECT ANSWER -1
On a 2070 MMU monitor unit, how does the field tech program allowable phases? - CORRECT
ANSWER - Remove 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? - CORRECT ANSWER - Yes, it by-passes the conflict feature and will not flash
On a NEMA CMU program card, how does the signal tech program allowable phases? -
CORRECT ANSWER - Install copper jumpers and soldering them on the program card
According to best maintenance practices, how often should CMU/MMU be tested? - CORRECT
ANSWER - Annually
The MMU indicates a RED-FAIL fault on phase 6. Why? - CORRECT ANSWER - The
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 - CORRECT ANSWER - Controller health
When a Technician is recertifying the CMU/MMU at an intersection, what should the technician
do to have the intersection exit flash? - CORRECT ANSWER - Replace 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? -
CORRECT ANSWER - Red Fail
Which of the following can be programmed on an MMU to latch after a fault occurs? -
CORRECT ANSWER - Field check
How often is an MMU's clock updated from the controller? - CORRECT ANSWER -
Once a second
In a signal cabinet, on the signal monitor, what does a field check indicate? - CORRECT
ANSWER - The 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? - CORRECT ANSWER - NEMA monitors have
wire jumpers missing in all positions, the tech solders the ones in that allow phases to run
together.
When the controller timings DO NOT match the timing sheet, who should be contacted for
correct
times? - CORRECT ANSWER - Traffic Engineer
An older TS1 cabinet experiences a flash condition but the signal heads are also showing active
green, yellow, and red indications. What is the MOST COMMON issue? - CORRECT
ANSWER - The mercury contactor is stuck in the normal position.
In a Dual-Ring, 8-phase traffic signal controller, how many phases can run in each ring at the
same
time? - CORRECT ANSWER -1
Observations indicate that vehicles are being detected in one lane and that this is shown on the
detection interface unit. However, the controller does not show any detection for that phase. This
UPDATED ACTUAL Exam Questions and
CORRECT Answers
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? - CORRECT ANSWER -1
On a 2070 MMU monitor unit, how does the field tech program allowable phases? - CORRECT
ANSWER - Remove 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? - CORRECT ANSWER - Yes, it by-passes the conflict feature and will not flash
On a NEMA CMU program card, how does the signal tech program allowable phases? -
CORRECT ANSWER - Install copper jumpers and soldering them on the program card
According to best maintenance practices, how often should CMU/MMU be tested? - CORRECT
ANSWER - Annually
The MMU indicates a RED-FAIL fault on phase 6. Why? - CORRECT ANSWER - The
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 - CORRECT ANSWER - Controller health
When a Technician is recertifying the CMU/MMU at an intersection, what should the technician
do to have the intersection exit flash? - CORRECT ANSWER - Replace 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? -
CORRECT ANSWER - Red Fail
Which of the following can be programmed on an MMU to latch after a fault occurs? -
CORRECT ANSWER - Field check
How often is an MMU's clock updated from the controller? - CORRECT ANSWER -
Once a second
In a signal cabinet, on the signal monitor, what does a field check indicate? - CORRECT
ANSWER - The 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? - CORRECT ANSWER - NEMA monitors have
wire jumpers missing in all positions, the tech solders the ones in that allow phases to run
together.
When the controller timings DO NOT match the timing sheet, who should be contacted for
correct
times? - CORRECT ANSWER - Traffic Engineer
An older TS1 cabinet experiences a flash condition but the signal heads are also showing active
green, yellow, and red indications. What is the MOST COMMON issue? - CORRECT
ANSWER - The mercury contactor is stuck in the normal position.
In a Dual-Ring, 8-phase traffic signal controller, how many phases can run in each ring at the
same
time? - CORRECT ANSWER -1
Observations indicate that vehicles are being detected in one lane and that this is shown on the
detection interface unit. However, the controller does not show any detection for that phase. This
