100+ Free IMSA Bench Tech II Practice Questions

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Question 1

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A BBS (battery backup system) for a typical NEMA signal cabinet is generally sized to:

Replace utility service permanently

Power only the cabinet fan

Power the intersection in full color for at least 2 hours, then drop to red flash for several more hours

Only protect the controller, not the field signals

to track

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2026 Statistics

Key Facts: IMSA Bench Tech II Exam

100

Practice Questions

OpenExamPrep bench-tech bank

Pass/Fail

IMSA Result Reporting

IMSA does not release numeric scores

Bench II

Lowest Bench Tech Tier

IMSA bench path starts at Level II

5 yrs

Experience for Senior Bench III

IMSA Senior Bench Tech III requirements

3 yrs

Certification Validity

IMSA recertification policy

153.6 kbps

TS2 SDLC Port 1 Speed

NEMA TS2-2021

The IMSA Traffic Signal Bench Technician Level II exam validates cabinet/electronics bench-repair competence and is distinct from the Field Technician II credential focused on street-side signal maintenance. IMSA does not publicly publish a question count, time limit, or numeric passing score; results are reported pass/fail. Bench Tech II is the entry point of IMSA's bench-technician path (there is no Bench Tech I) and is required, along with the Microprocessors in Traffic Signals exam and five years of experience, to challenge the Senior Bench Technician Level III. Core content: NEMA TS1/TS2 cabinet wiring, 170/2070/ATC controllers, MMU programming and testing, loop and video detection, BBS/UPS, pedestrian and APS timing, EVP/TSP, and bench test equipment.

Sample IMSA Bench Tech II Practice Questions

Try these sample questions to test your IMSA Bench Tech II exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a NEMA TS1 cabinet, which connector carries the load-switch driver outputs from the controller to the back panel?

A.MS-A

B.MS-B

C.MS-C

D.MS-D

Explanation: In a NEMA TS1 cabinet the controller is wired to the back panel through three round MS-type connectors designated A, B, and C. The MS-A connector carries load-switch driver outputs (green/yellow/red and walk/ped-clear outputs) from the controller to the field terminals.

2What is the fundamental wiring difference between a NEMA TS1 cabinet and a NEMA TS2 Type 1 cabinet?

A.TS2 Type 1 replaces the MS-A/B/C parallel wiring with an SDLC serial data bus

B.TS2 Type 1 uses higher field-output voltage than TS1

C.TS2 Type 1 eliminates the conflict monitor and load switches

D.TS2 Type 1 is wired with single-conductor 600 V cables instead of multi-conductor harnesses

Explanation: NEMA TS2 Type 1 cabinets replace the parallel A/B/C cable architecture used in TS1 with a high-speed SDLC serial data bus (Port 1). The controller, MMU, BIUs, and detector racks all communicate digitally instead of through dedicated point-to-point pins.

3A NEMA TS2 Type 2 cabinet is most accurately described as:

A.A TS1 cabinet with no SDLC bus

B.A TS2 cabinet that retains MS-A/B/C connectors so it can run TS1-style controllers

C.A TS2 cabinet without an MMU

D.An ATC cabinet using ITS Cabinet v2 architecture

Explanation: TS2 Type 2 keeps the legacy MS-A/B/C connectors so TS1-style controllers can be used while still benefiting from TS2 features such as the MMU and certain BIU functions. It provides downward compatibility for agencies upgrading equipment in stages.

4On a NEMA load switch, which output triggers when the controller energizes the green driver pin?

A.Pin 3 (Red field output)

B.Pin 4 (Yellow field output)

C.Pin 6 (Green field output)

D.Pin 1 (AC neutral)

Explanation: A standard NEMA TS1/TS2 load switch is a three-channel solid-state relay. Energizing the green driver input switches AC line voltage to the green field output, typically wired at pin 6 on the NEMA load-switch socket.

5What component in a NEMA cabinet provides the AC-line isolation point and is required to remove all 120 VAC field output power for safe bench work on the back panel?

A.The CMU/MMU reset button

B.The police panel auto/flash switch

C.The signal bus main circuit breaker (or main disconnect)

D.The detector rack power switch

Explanation: The signal bus is fed from the cabinet's main service through a main circuit breaker (often labeled MAIN or SIGNAL BUS) inside the cabinet. Opening this breaker removes 120 VAC from the load switches and field terminals, which is required before any back-panel troubleshooting.

6Which color is conventionally used for the AC equipment grounding conductor inside a NEMA traffic signal cabinet?

A.White

B.Green (or green with yellow stripe)

C.Black

D.Red

Explanation: Per NEC conventions used in cabinet wiring, the equipment grounding conductor is green or green with a yellow stripe. White is the grounded (neutral) conductor and black/red are ungrounded line conductors.

7On a TS2 Type 1 cabinet, what is the role of the Bus Interface Unit (BIU) in the detector rack?

A.It rectifies AC field input to DC for the detector amplifiers

B.It packages detector amplifier call states onto the SDLC Port 1 bus for the controller

C.It directly switches the green field load output

D.It synchronizes coordination offsets between adjacent intersections

Explanation: In a TS2 Type 1 cabinet the detector rack BIU collects vehicle and pedestrian call states from the detector amplifiers and packages them into SDLC frames on Port 1 so the controller can read them. The controller and MMU each have their own BIUs for the same reason.

8Which TS2 SDLC bus carries the controller-to-MMU and detector-rack data traffic?

A.Port 1

B.Port 2

C.Port 3 (C2S serial)

D.Port 5 (Ethernet)

Explanation: Port 1 is the cabinet SDLC serial bus that links the controller, MMU, and detector-rack BIUs at 153.6 kbps. Port 2 is generally used for system communications; other ports are not part of the TS2 Port 1 cabinet bus.

9A flash transfer relay in a NEMA cabinet is energized when:

A.The cabinet is running normal automatic operation under controller command

B.The cabinet is placed in flash by the conflict monitor, flasher unit, or police panel

C.Preemption is active

D.Coordination is enabled

Explanation: Flash transfer relays select between controller-driven load-switch outputs and the flasher unit outputs. They energize and route the flasher outputs to the field when the cabinet is commanded into flash by the CMU/MMU, the flasher logic, or the police-panel switch.

10In TS1 cabinet wiring, which pin function on the MS-B connector lets the controller force the cabinet into flash mode for diagnostic testing?

A.Stop Time input

B.Manual Control Enable input

C.MMU Flash output (controller-commanded flash)

D.Coordination Free input

Explanation: The controller can command flash by driving an output (commonly the controller flash or MMU flash control line) on MS-B. The conflict monitor or MMU honors this command and switches the flash transfer relays. Stop Time only halts timing; manual control enable allows external phase commands; coordination free is a system-mode input.

About the IMSA Bench Tech II Exam

The IMSA Traffic Signal Bench Technician Level II certification is the IMSA bench-side credential for technicians who repair, test, and configure traffic signal cabinet electronics in a shop or bench environment. Unlike the IMSA Traffic Signal Field Technician II credential, which targets on-street signal maintenance, Bench Tech II focuses on cabinet wiring, conflict monitor / MMU programming and testing, load switches, 170/2070/ATC controllers, loop and video detection electronics, battery backup systems, and bench-grade diagnostics. IMSA's Bench Technician path starts at Level II - there is no separate Level I - and Level II is the prerequisite for the Senior Bench Technician Level III certification, which additionally requires passing the IMSA Microprocessors in Traffic Signals exam and five years of field experience.

Assessment

Multi-hour written multiple-choice exam. IMSA does not publish an official question count or time limit; this practice bank uses an estimated 100 questions consistent with industry exam-prep practice.

Time Limit

Not officially published; agents typically allow a multi-hour written sitting

Passing Score

Pass/Fail (IMSA does not release numeric scores)

Exam Fee

Varies by IMSA section; typically $200-$400 for IMSA members (International Municipal Signal Association (IMSA), administered through regional IMSA sections)

IMSA Bench Tech II Exam Content Outline

18%

NEMA TS1 / TS2 Cabinet Wiring

TS1 MS-A/B/C connectors, TS2 SDLC Port 1, BIUs, load switches, flash transfer relays, grounding, and field-cable conventions.

18%

170 / 2070 / ATC Controllers

Differences between Type 170 and 2070, ATC 5201/5401 standards, 2070 modules, firmware loading, time-of-day scheduling, coordination splits and offsets, and NTCIP 1202.

16%

CMU / MMU Programming and Testing

Type 12/16 channels, Type 1 vs Type 2 (Diamond) program cards, FYA pairing, permissive matrices, RED ENABLE, watchdog input, and bench-test procedures.

12%

Loop and Video Detection

Inductive loop tuning, lead-in cable, splice technique, presence vs pulse, video and radar detection, and detector amplifier diagnostics.

10%

UPS / Battery Backup Systems

BBS sizing, automatic transfer switches, AGM batteries, temperature compensation, inverter efficiency, and capacity testing.

10%

Pedestrian Timing and APS

MUTCD walking-speed assumptions, walk and pedestrian-clearance interval programming, FDW, LPI, and accessible pedestrian signals.

EVP and Transit Signal Priority

Optical preempt systems (Opticom/GTT/Tomar/Whelen), confirmation lights, dwell/entry/exit timings, and TSP strategies.

Test Equipment and Troubleshooting

True-RMS DMMs, oscilloscopes, controller simulators / load switch testers, swap-isolation troubleshooting, electrical safety, and bench commissioning.

How to Pass the IMSA Bench Tech II Exam

What You Need to Know

Passing score: Pass/Fail (IMSA does not release numeric scores)
Assessment: Multi-hour written multiple-choice exam. IMSA does not publish an official question count or time limit; this practice bank uses an estimated 100 questions consistent with industry exam-prep practice.
Time limit: Not officially published; agents typically allow a multi-hour written sitting
Exam fee: Varies by IMSA section; typically $200-$400 for IMSA members

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

IMSA Bench Tech II Study Tips from Top Performers

1Map every fault category on a current EDI or Reno MMU manual to a specific MMU program-card jumper (permissives, RED ENABLE, watchdog, walk enable, field check).

2Memorize the differences between NEMA TS1 (MS-A/B/C parallel), TS2 Type 1 (SDLC Port 1 only), and TS2 Type 2 (MS connectors plus MMU) cabinets.

3Be able to recite the 2070-ATC module assignment: 1A/1B/1C CPU, 2A field I/O, 3B front panel, 4A power supply, 7A async serial.

4Practice flashing yellow arrow (FYA) channel-pair programming with a Type 2 (Diamond) program card.

5Know default MUTCD pedestrian walking speeds (3.5 ft/s general design, slower for special pedestrian populations) and how to compute FDW from crosswalk length.

6Drill swap-isolation troubleshooting: load switch swap, MMU swap, BIU swap, controller swap, and what each tells you about wiring vs electronics.

7Be comfortable reading an oscilloscope trace of SDLC Port 1 (NRZI differential at ~153.6 kbps) so you can recognize bus or termination problems.

8Run timed practice sets that mix cabinet wiring, controllers, MMU, detection, and BBS - the real exam moves fast across topics.

Frequently Asked Questions

What is the IMSA Traffic Signal Bench Technician Level II exam?

It is the entry credential in IMSA's Bench Technician path, validating that the technician can repair, test, and configure traffic signal cabinet electronics in a shop or bench setting. Subject matter focuses on cabinet wiring, conflict monitor / MMU programming and testing, load switches, 170/2070/ATC controllers, detection electronics, BBS, and bench diagnostics.

How is Bench Tech II different from Field Technician II?

Field Technician II focuses on on-street signal maintenance, coordination, plan reading, and field-side operations. Bench Tech II focuses on cabinet/electronics bench repair - load switches, MMUs, controllers, detector amplifiers, BBS, and test-equipment use. The two certifications complement each other and many agencies value both.

Is there an IMSA Bench Technician Level I?

No. IMSA's Bench Technician path starts at Level II. There is no separate Level I exam. The next step above Bench Tech II is the Senior Bench Technician Level III, which additionally requires passing the IMSA Microprocessors in Traffic Signals exam and five years of traffic-signal experience.

How many questions are on the IMSA Bench Tech II exam?

IMSA does not publicly publish an official question count or time limit. Most candidates report a multi-hour written multiple-choice exam at roughly the 100-question level, which is what this practice bank is sized to.

What passing score do I need?

IMSA reports Bench Tech II results as pass/fail and does not release a numeric percentage to candidates. The objective is broad mastery across NEMA TS1/TS2 wiring, controllers, MMU programming, detection, BBS, and bench test equipment.

How much does the Bench Tech II exam cost?

Exam fees are set by the IMSA section administering the exam and typically fall in the $200-$400 range for IMSA members. Non-member pricing is usually higher and a separate review/training class adds to the total.

What topics are most heavily tested?

NEMA TS1/TS2 cabinet wiring and 170/2070/ATC controllers are the largest blocks, followed by MMU/CMU programming and testing. Loop and video detection, BBS, pedestrian timing, EVP/TSP, and bench test equipment round out the content.

What is the path to Senior Bench Technician Level III?

Senior Bench Tech III requires a current IMSA Bench Tech II certification, a passing score on the IMSA Microprocessors in Traffic Signals exam, and five years of traffic-signal experience. Senior Bench III is the highest IMSA bench credential.