Download IMSA Traffic Signal Technician Level 1 Practice Exam: Questions and Answers and more Exams Traffic Control and Regulation in PDF only on Docsity!
IMSA TRAFFIC SIGNAL TECHNICIAN LEVEL 1
PRACTICE EXAM ALL QUESTIONS AND CORRECT
ANSWERS 2025/
What is the primary function of the IMAS? - ANSWER: Safety Education IMSA Stands for - ANSWER: International Municipal Signal Association The advanced transportation controller was developed to provide: - ANSWER: Open architecture hardware and software platform Which of the following type of controller assemblies, without adapters, can accept multiple software platforms and be utilized in all types fo cabinets: - ANSWER: 2070 controller What is another term for load switches used in 170/2070 controllers? - ANSWER: switch packs Which type of controller was introduced to supersede the 170 controller? - ANSWER: 2070 controller the NEMA TS- 2 standards cover the same items as the TS- 1 standards but expand the requirements to include which of the following: - ANSWER: Treatment fo signal preemption What is NOT part of an underground power service: - ANSWER: Conduit rise with weatherhead
Two common types of signal pole installations are - ANSWER: Direct buried and foundation The first type of testing performed on a controller cabinet assembly is - ANSWER: bench test Which of the following is NOT an IMSA certification? - ANSWER: Traffic Signal Level III Bridge Technician Which of the following are potential safety hazards? - ANSWER: overhead and underground power, gas, aerial lift equipment. Tra What are the sections of a ramp mete signal - ANSWER: Circular red, circular green PPE stands for - ANSWER: Personal Protective Equipment A work zone supervisor is responsible for which of the following tasks: - ANSWER: Ensure advance warning devices have not been removed or relocated. Which of the following is NOT a sentence type in the MUTCD? Standards; requirement that have to be followed. Guidance; recommendations that are to be followed unless there I good reason not to. Objectives; reasons behind the standards and guidance. Support; additional information to clarify the standards and guidance. - ANSWER: Objectives; reasons behind the standards and guidance
The only point in the cycle of a coordinated traffic signal controller where the major street phase is allowed to end is called - ANSWER: Yield point Which of ht following is NOT a common mode of operation for timing plans in a signal system? - ANSWER: Traffic Related Two common terms to describe traffic signal supports and signal heads are - ANSWER: rigid and free-swinging IN a single wire with. single point attachment configuration, the wire that supports the signal heads is called the - ANSWER: Messenger Wire The two nominal diameter sizes for vehicular signal lenses are: - ANSWER: 8 in (200mm) and 12 in (300mm) The purpose of "Louvers" is to: - ANSWER: make signal visible from a specific lane Which of the following types of conduit are used for traffic signals? - ANSWER: Rigid Steel conduit High-density Polyethylene (HDPE) PVC Schedule 40 Traffic signal supports are NOT used to display the following items: - ANSWER: Advertisements Which of the following is a disadvantage of mast arms: - ANSWER: Large Foundation
Loop detectors operate on the principle of: - ANSWER: inductance The piece of cable that connects the controller cabinet to the loops is called a: - ANSWER: Lead-in-cable The outer jacket of loop lead-in cable is typically made of: - ANSWER: Polyethylene What is and advantage of video detection systems? - ANSWER: Images can sent to remote locations Which of the following is a type of microwave detector: - ANSWER: frequency- modulated continuous wave (FMCW) A 6' x 60' loop typically has how many turns of wire: - ANSWER: two The primary function of the CMU is: - ANSWER: prevent conflicting signal indications What is NOT part of an overhead power service: - ANSWER: Pull box or boxes Typical back-up battery systems provide battery power in case of an outage to a signal for: - ANSWER: 2 to 6 hours A major distinguishing feature between NEMA TS- 1 and TS- 2 controllers is: - ANSWER: Data bus
Road users at an intersection submitting a sufficient number of requests for installation of a signal based on local requirements. Pedestrian volumes indicate a need in order to allow safe crossing of a road Historical crash data shows that a signal would potentially improve safety conditions - ANSWER: Road users at an intersection submitting a sufficient number of requests for installation of a signal based on local requirements a plans preparation manual indicates information regarding: - ANSWER: Amount of detail, information, and proper format for traffic signal plans. EEO participation requires the contractor to: - ANSWER: maintain a percentage of minority workers on the project. What is the purpose of traffic signal inspection? - ANSWER: to provide a record of construction, to document results of tests, to verify installation meets the requirements of the plans and contract documents. in case of the perceived need for a traffic signal to allow pedestrians to cross a roadway, pedestrian volume counts are typically performed for what time duration? - ANSWER: 8 hours which of the following does a traffic signal designer have to take into consideration when designing a signal? - ANSWER: signal phasing, utilities, cost Which of the following ar considerations that should be taken into account when designing a new traffic signal? - ANSWER: types of preemption required, coordination with nearby traffic signals, traffic characteristics at the location.
Multimeters are used to check - ANSWER: resistance, voltage, current What devise is used to measure the resistance or breakdown strength of conductor insulation: - ANSWER: megohmmeter What device dos a technician use to troubleshoot existing loops already installed in the field: - ANSWER: loop analyzer Resistance as expressed by Ohm's law is - ANSWER: R=E/I Ohm's law is useful in the design and troubleshooting of circuits and describes the mathematical relationship of the following: - ANSWER: voltage, current, resistance. The typical traffic signal controller assembly is powered by what type of electrical current: - ANSWER: 120 volts of AC The two types of traffic signal maintenance that are typically performed are: - ANSWER: Emergency and scheduled maintenance an example of emergency maintenance is: - ANSWER: power outages/surges due to electrical storm A good nice step procedure for troubleshooting is: - ANSWER: observe, identify, determine, correct, observe again
When dealing with the public a technician should not: - ANSWER: threaten anyone, use technical jargon Some agencies have found the it is more cost efficient to replace the lamps: - ANSWER: on a regularly scheduled basis Effective determination of the cause of a failure in a traffic signal is called: - ANSWER: troubleshooting what is the 5 step troubleshooting procedure - ANSWER: 1. observe 2 identify 3 determine 4 correct 5 observe again What is as important as performing the maintenance itself? - ANSWER: documentation of emergency maintenance. When should documentation of a failure begin? - ANSWER: when a failure is traffic signal is first reported. a Circuit that is wired in series is one where: - ANSWER: the current goes through all of the electrical components of the circuit a Circuit that is wired in Parallel is one where: - ANSWER: each component has its own direct path.
Circuits are wired in and - ANSWER: series and parallel Ohm's law is a set of formulas that describe the mathematical relationship between:
- ANSWER: Voltage (E), current (I), and resistance (R). What is a load switch tester also known as? - ANSWER: Multi-switch tester A Load switch tester or multi-switch tester is used to: - ANSWER: verify the correct operation of a load switch. The unit verified that the correct current outputs are within the acceptable range for operation. Slot testers are available that: - ANSWER: plug into the cabinet detector card rack and enable the technician to measure voltage, continuity and or resistance for each internal connection in the cabinet. A loop analyzer is a unit that: - ANSWER: a signal technician uses to troubleshoot existing loops and test newly installed loops An ammeter or current probe is: - ANSWER: a device that measures the current flowing through a wire or circuit. A multimeter can detect the: - ANSWER: resistance, voltage, or current of an electrical circuit. In the case of significant underground utility congestion or of the presence of utilities with potentially catastrophic consequences if damaged, a is a good option. - ANSWER: soft-dig
Flasher units flash at a rate of: - ANSWER: no less than 50 and no more than 60 per minute a difference between NEMA cabinets and 170 cabinets is NEMA cabinets - ANSWER: require connection with harnesses pre-wired into the cabinet. Controller cabinets can perform functions such as - ANSWER: changing the signal indications, collecting and analyzing vehicle could and communicating with other contorllers Which type of transmitter transmits low energy microwave radiation at a detection zone? - ANSWER: Doppler microwave radars detectors a disadvantage of video detection systems is: - ANSWER: may involve a higher initial installation cost What activates a signal loop? - ANSWER: decrease in inductance Loop detector installed in. double rectangle is called a - ANSWER: quadrupole what drives energy through the loop detector? - ANSWER: loop amplifier a metallic pull box lid must be - ANSWER: bonded to a grounding source cable coiled in a pull box is called - ANSWER: slack cable. pull boxes should have some type of - ANSWER: drainage capability
visibility limited displays appear dark to to drivers unless drivers are: - ANSWER: within the are programmed by the technician. another word for break away base: - ANSWER: frangible base A wire that is attache to the bottoms of the signal heads to prohibit excessive movement or spinning of the traffic signals on the support wire - ANSWER: tether wire where copper cables are terminated in local controller cabinets - ANSWER: interface panel a hybrid system combines - ANSWER: closed loop systems with central computer systems a command that forces the traffic signal controller to end the green display for an actuated phase - ANSWER: force off the number of seconds from a common signal cycle point to a known point in the cycle Cush as the end of the green indication for the major street - ANSWER: offset for coordinated traffic cycles, all signals must have the same - ANSWER: cycle length. pedestrian consists of a flashing upraised hand that shall begin immediately following the walking person signal indication - ANSWER: change interval
NEC - ANSWER: NAtional electric code NESC - ANSWER: National Electrical Safety Code CEC - ANSWER: Canadian Electrical Code
