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TRAFFIC SIGNAL FIELD TECHNICIAN IMSA TRAFFIC SIGNAL
TECHNICIAN LEVEL 1 AND 2 EXAM | INTERNATIONAL
MUNICIPAL SIGNAL ASSOCIATION | QUESTIONS AND ANSWERS |
VERIFIED ANSWERS GRADED A+ | LATEST EXAM UPDATE
What organization has established requirements for PPE in certain working situations? - CORRECT ANSWER - OSHA/CCOHS Which of the following certifications must be attained first? - CORRECT ANSWER - Traffic signal Tech. Level 1 Upgrades or revisions to the traffic signal are the responsibility of whom? - CORRECT ANSWER - professional engineer What is NOT an example of documentation that can limit the liability of the technician and/or agency? - CORRECT ANSWER - NTCIP What is the single most important focus that the field technician should have? - CORRECT ANSWER - safety For many agencies, what is the least amount of technicians required to perform work with an aerial lift? - CORRECT ANSWER - 2 What is NOT true when it comes to dealing with the public? - CORRECT ANSWER - If you are unsure of the answer, give them the incorrect information so you can keep working
What is NOT a function of a modern traffic signal controller? - CORRECT ANSWER - Processing when a vehicle has run a red light and informing the police What was a major drawback with the first traffic signal controllers? - CORRECT ANSWER - Maintaining the mechanical parts When did standardization of controllers become established in the United States and Canada? - CORRECT ANSWER - 1970s What was limited by the fourth proprietary connector used with the NEMA TS- 1? - CORRECT ANSWER - the type of replacement model Which type of controller utilizes a high speed data channel between all major equipment to maximize the functionality and expandability of the controller assembly? - CORRECT ANSWER - NEMA TS-2 Type 1 What greatly reduced wire connections in the controller cabinet with the use of the RS-485 with the SDLC? - CORRECT ANSWER - Bus interface unit What was the intent of developing the ATC specifications? - CORRECT ANSWER - To have an open architecture hardware and software platform for ITS application Which agency developed a communications protocol for ITS systems, field devices and software so basic functionality should be interchangeable regardless of the manufacturer? - CORRECT ANSWER - NTCIP Before beginning work that requires workers or vehicles to be in or over the roadway, what should traffic signal field technicians ensure is in place? - CORRECT ANSWER - Temporary traffic control (TTC)
What is the purpose of relays in a traffic signal system? - CORRECT ANSWER - to transfer the outputs from one component to another What device minimizes the amount of voltage that might be available at a pedestrian push button should the button malfunction? - CORRECT ANSWER
- Isolator Which of the following combinations would cause the signal to enter flashing mode according to NEMA? - CORRECT ANSWER - green & yellow yellow & red walk & yellow What feature is included in the 170 or 2070 monitors vs. the NEMA monitor? - CORRECT ANSWER - plug in Which group of features best describes why malfunction monitoring units are more advanced then conflict monitors? - CORRECT ANSWER - ethernet connections monitoring SDLC communications RS-232 communications port Which type of power supply lines are attached from the power supply (service) inside the power panel?
- 120 v, 40 H, single phase, AC+ and AC-
- 120 v, 60 H, single phase DC+ and DC-
- 120 v, 60 H, single phase AC+ and AC-
- 240 v, 60 H, single phase AC+ and AC- - CORRECT ANSWER - 120 v, 60H, single phase, AC+ and AC-
What is NOT an improved feature of the NEMA TS-2 power supply, when compared to the NEMA TS-1 power supply? - CORRECT ANSWER - 24 V DC power for solar panels At what time can a mercury contactor be disposed of in a typical trash collection receptacle? - CORRECT ANSWER - it can never happen List what is a part of the permanent emergency generator system? - CORRECT ANSWER - uninterrupted supply of power direct connection to the power supply panel external fuel source What is a direct current (DC)? - CORRECT ANSWER - an electrical current that has a unidirectional flow of electric charge A transformer/rectifier is used to supply __________ VDC to electronic components? - CORRECT ANSWER - 24 What type of circuit is the current through each of the components the same? - CORRECT ANSWER - series Voltage is the electrical driver that moves what type of charged electrons through wires and electrical devices? - CORRECT ANSWER - negatively charged Lightly to moderately doped semiconductor is referred to as? - CORRECT ANSWER - extrinsic Which of the following is a 2 terminal device? - CORRECT ANSWER - diode
Resistance of meters used to measure current are normally? - CORRECT ANSWER - very low What does OTDR mean? - CORRECT ANSWER - optical time domain reflectometer In what type of controller is the cycle sometimes called a "dial" because a rotating dial is used to control the timing of the various signal displays? - CORRECT ANSWER - older electromechanical List 2 things that describe the vehicle movement made at an intersection? - CORRECT ANSWER - direction of approach manuever In usual convention, how are through phases numbered? - CORRECT ANSWER - in a clockwise direction starting with phase 2 Some agencies refer to a combination of movements as a phase. This is also true in some older controller assemblies that operate with what maximum amount of phases? - CORRECT ANSWER - 4 When it comes to barriers for dual ring controllers there are _______ barriers, one for leaving ________ street and one for leaving ________ street - CORRECT ANSWER - 2, major, minor Is this true about an independent overlaps: An independent overlap follows a designated phase - CORRECT ANSWER - no Parent/child overlaps are the most common type of overlap. The overlap is viewed as the ________ because it is only present when one or more phase is
active, which is referred to as the ______ - CORRECT ANSWER - child, parent This left turn phase is defined as "both modes occur on an approach during the same cycle"? - CORRECT ANSWER - protected/permissive The yellow-red flashing mode provides the same type of control as a 2 way stop control where only the minor streets have a what? - CORRECT ANSWER - stop sign In order to ensure fail safe operation , what occurs when a conflict monitor unit (CMU) detects a fault? - CORRECT ANSWER - the flash transfer relays have all of the signals display red What factors might be included in determining the most appropriate time for an all red clearance?
- type of vehicular traffic
- driver characteristics
- Pedestrian activity
- all the choices are correct - CORRECT ANSWER - all the choices are correct What is the time relationship determined by the difference between a fixed point in the cycle length and a system reference point? - CORRECT ANSWER - offset What are the components of volume-density signal timings? - CORRECT ANSWER - gap reduction What are factors of gap reduction allowing for extension/passage time to be reduced? - CORRECT ANSWER - time to reduce
What signal indications can be displayed at a railroad crossing? - CORRECT ANSWER - 3 section head with red, yellow & green indications What does NOT need to be considered for drawbridge preepmtion of a traffic signal? - CORRECT ANSWER - audible alarms What is NOT a basic component of an optical system? - CORRECT ANSWER
- isolators Transit property operates by providing which of the following scenarios? - CORRECT ANSWER - green indication is extended to provide additional green time for the transit vehicle Out of pavement (non-intrusive) detection includes which of the following? - CORRECT ANSWER - microwave video radar With an inductive loop, what energizes the wires placed in the pavement? - CORRECT ANSWER - loop detector amplifier What is an advantage associated with inductance loops? - CORRECT ANSWER - maintenance is simplified Why is the installation of inductive loop detectors the most labor intensive type of vehicle detections systems? - CORRECT ANSWER - - it uses more materials than other types of detection systems
- the installation requires many workers
- the loop wire must not have any kinks, no breaks in insulation, and have a solid watertight splice to the lead in cable
Which type of loop detector offers the greatest range of capabilities? - CORRECT ANSWER - multiple channel loop detectors _____________ are needed to be adjusted to eliminate any detection irregularities due to interference problems with detectors? - CORRECT ANSWER - frequency and sensitivity What types of loops are used for traffic count purposes and for coordinating the traffic signal system based upon real-time traffic volumes? - CORRECT ANSWER - system What is a disadvantage of video imaging detection systems? - CORRECT ANSWER - maintenance requires advanced technical training Which advanced traffic control environment can distributed architecture NOT provide the necessary performance? - CORRECT ANSWER - traffic coordinated control What is the common term for a cable that transmits data between controllers and on-street masters/central computers? - CORRECT ANSWER - hardwire Define POTS - CORRECT ANSWER - plain old telephone service Which of the following is NOT a dip switch setting? - CORRECT ANSWER - cycle length What's true about fiber optic cables? - CORRECT ANSWER - - can transmit data faster than older copper cables
- data can be sent sent in both directions are the same time
- can be utilized for closed circuit television feeds
