Page 1 of 57
IMSA Traffic Signal Technician 2 & 1 exam ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR
IMSA Traffic Signal Technician 2
QUESTION: Which of the following can be programmed on an MMU to latch after a fault
occurs? - ANSWER-Field check
QUESTION: How often is an MMU's clock updated from the controller? - ANSWER-Once a
second
QUESTION: In a signal cabinet, on the signal monitor, what does a field check indicate? -
ANSWER-The signal indications don't match the controller output for a phase
QUESTION: A NEMA CMU/MMU uses a program card to tell the monitor which phases are
permitted to run together. Which answer is CORRECT? - ANSWER-NEMA monitors have wire
jumpers missing in all positions, the tech solders the ones in that allow phases to run together.
1
, Page 2 of 57
QUESTION: When the controller timings DO NOT match the timing sheet, who should be
contacted for correct
times? - ANSWER-Traffic Engineer
QUESTION: 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? -
ANSWER-The mercury contactor is stuck in the normal position.
QUESTION: In a Dual-Ring, 8-phase traffic signal controller, how many phases can run in each
ring at the same
time? - ANSWER-1
QUESTION: 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 could be caused by - ANSWER-Improper detection phase assignment
programming in the controller
2
, Page 3 of 57
QUESTION: As soon as vehicles leave the detection zone of an approach that has met its
minimum green time, a signal immediately goes to yellow from the green display. This could be
a result of - ANSWER-no extension time programmed.
QUESTION: What is one reason the phase interval may change even though there is still vehicle
demand? - ANSWER-maximum green time has been met
QUESTION: A signal tech is reviewing the controller logs and continually sees a cycle fault error.
What does that
mean? - ANSWER-The CU has not serviced a call in two cycles while in free mode.
QUESTION: A coordinated corridor is working well except at one intersection where a platoon
of vehicles is being stopped. The MOST LIKELY problem is the - ANSWER-clock has drifted
affecting the offset and needs adjusting
QUESTION: Observations indicate that right turning vehicles approach the intersection on the
side street, stop and then make a right turn on red. When this happens the signals cycle to the
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, Page 4 of 57
side street even though there are no longer vehicles present in the detection zone. This could
be caused by - ANSWER-the detection being set to locking detection
QUESTION: Of the following, which answer MOST LIKELY would require a controller database be
verified to be
correct? - ANSWER-When a controller upgrade has been performed
Q; 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? - ANSWER-1
QUESTION: On a 2070 MMU monitor unit, how does the field tech program allowable phases? -
ANSWER-Remove diode on program card for allowable phases
QUESTION: On an MMU, is it possible to tape the reset button to prevent the traffic signal from
going into flash? - ANSWER-Yes, it by-passes the conflict feature and will not flash
4
IMSA Traffic Signal Technician 2 & 1 exam ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR
IMSA Traffic Signal Technician 2
QUESTION: Which of the following can be programmed on an MMU to latch after a fault
occurs? - ANSWER-Field check
QUESTION: How often is an MMU's clock updated from the controller? - ANSWER-Once a
second
QUESTION: In a signal cabinet, on the signal monitor, what does a field check indicate? -
ANSWER-The signal indications don't match the controller output for a phase
QUESTION: A NEMA CMU/MMU uses a program card to tell the monitor which phases are
permitted to run together. Which answer is CORRECT? - ANSWER-NEMA monitors have wire
jumpers missing in all positions, the tech solders the ones in that allow phases to run together.
1
, Page 2 of 57
QUESTION: When the controller timings DO NOT match the timing sheet, who should be
contacted for correct
times? - ANSWER-Traffic Engineer
QUESTION: 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? -
ANSWER-The mercury contactor is stuck in the normal position.
QUESTION: In a Dual-Ring, 8-phase traffic signal controller, how many phases can run in each
ring at the same
time? - ANSWER-1
QUESTION: 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 could be caused by - ANSWER-Improper detection phase assignment
programming in the controller
2
, Page 3 of 57
QUESTION: As soon as vehicles leave the detection zone of an approach that has met its
minimum green time, a signal immediately goes to yellow from the green display. This could be
a result of - ANSWER-no extension time programmed.
QUESTION: What is one reason the phase interval may change even though there is still vehicle
demand? - ANSWER-maximum green time has been met
QUESTION: A signal tech is reviewing the controller logs and continually sees a cycle fault error.
What does that
mean? - ANSWER-The CU has not serviced a call in two cycles while in free mode.
QUESTION: A coordinated corridor is working well except at one intersection where a platoon
of vehicles is being stopped. The MOST LIKELY problem is the - ANSWER-clock has drifted
affecting the offset and needs adjusting
QUESTION: Observations indicate that right turning vehicles approach the intersection on the
side street, stop and then make a right turn on red. When this happens the signals cycle to the
3
, Page 4 of 57
side street even though there are no longer vehicles present in the detection zone. This could
be caused by - ANSWER-the detection being set to locking detection
QUESTION: Of the following, which answer MOST LIKELY would require a controller database be
verified to be
correct? - ANSWER-When a controller upgrade has been performed
Q; 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? - ANSWER-1
QUESTION: On a 2070 MMU monitor unit, how does the field tech program allowable phases? -
ANSWER-Remove diode on program card for allowable phases
QUESTION: On an MMU, is it possible to tape the reset button to prevent the traffic signal from
going into flash? - ANSWER-Yes, it by-passes the conflict feature and will not flash
4
