STUDY GUIDE 2026/2027 ACCURATE
QUESTIONS WITH CORRECT DETAILED ANSWER
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<RECENT VERSION>
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? - ANSWER ✔ 1
2. On a 2070 MMU monitor unit, how does the field tech program allowable
phases? - ANSWER ✔ Remove diode on program card for allowable phases
3. 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. On a NEMA CMU program card, how does the signal tech program
allowable phases? - ANSWER ✔ Install copper jumpers and soldering them
on the program card
5. According to best maintenance practices, how often should CMU/MMU be
tested? - ANSWER ✔ Annually
,6. The MMU indicates a RED-FAIL fault on phase 6. Why? - ANSWER ✔
The load switch/switch pack produces no outputs.
7. The purpose of the controller CVM (Controller Voltage Monitor) output is
to allow the CMU/MMU to
monitor the - ANSWER ✔ Controller health
8. When a Technician is recertifying the CMU/MMU at an intersection, what
should the technician do to have the intersection exit flash? - ANSWER ✔
Replace the CMU/MMU with a newly tested unit
9. Absence of all colors on a load switch will be indicated by what fault on an
MMU or MMU2? - ANSWER ✔ Red Fail
10.BIU - ANSWER ✔ bus interface unit
11.8 Channel and 16 channel chassis, are supported 4 racks 4- 8 - 12 bays & 16
- channel configurations. - ANSWER ✔ TS-2
12.TS2 connectors are what connector? - ANSWER ✔ serial connectors
13.TS - 2 BIS interface reduces WHAT? - ANSWER ✔ the complexity of the
controller cabinet and Hundreds of conductors
14.NTCIP - ANSWER ✔ the national transportation Communications for,
intelligent protocol
,15.NTCIP - ANSWER ✔ to accommodate subsystems and users OF (ITS)
16.SDLC - ANSWER ✔ synchronous data Link Communications
17.A (. ) fault, will stay until the monitor is reset - ANSWER ✔ a latching fault
18.a blank will return to its state once the power is restored to the system -
ANSWER ✔ non latching fault
19.these are primary functions of phasing conflicts, absence of red on a phase
and proper operating DC voltage. On what monitors? - ANSWER ✔ CMU
& MMU
20.examples of unlatching and latching Faults Are - ANSWER ✔ low voltage,
voltage drop, loss of 24 volt power supply.
21.load switches 1 through 6 - ANSWER ✔ 1. AC hot
2. ground,
3. red / don't walk output to indication
4. N/U
5. Yellow PED CRL /OUTPUT INDICATION
6. RED/ INPUT FROM CONTROLLER
22.Load switches 7-12 - ANSWER ✔ 7. Grn / output to indication
8. Y PED CRL / input to controller
9. 24 V
10. Grn Walk/ input to controller
11. AC NEUTRAL
12.NOT USED
, 23.The traffic field technician is responsible for performing what types of
maintenance on signals? - ANSWER ✔ Preventive and Emergency
24.The single most important focus for the traffic signal field technician is? -
ANSWER ✔ Safety
25.Three main categories of safety a traffic signal technician is responsible for?
- ANSWER ✔ Safety of motorist and pedestrians
His or her own personal safety
Safety of public and personal property
26.Traffic signal field technicians perform several maintenance and repair
functions above the ground and roadway typically using what two vehicles?
- ANSWER ✔ Bucket Truck
Aerial lift (platform truck)
27.While using a bucket truck or aerial lift what implement provides proper
protection for the user? - ANSWER ✔ Protective Harness
28.What responsibilities (liability) does a Traffic signal technician have while
involved in repair, testing or maintenance? - ANSWER ✔ Legal liability
Dealing with the public
29.It is imperative that the traffic signal field technician maintain
comprehensive what of all the steps taken during repair and maintenance of
traffic signals? - ANSWER ✔ Documentation