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Download ISMA TRAFFIC SIGNAL TECHNICIAN II EXAM 2 ||EXAM NEWEST ACTUAL EXAM || QUESTIONS AND CORREC and more Exams Electrical Engineering in PDF only on Docsity!
ISMA TRAFFIC SIGNAL TECHNICIAN II EXAM 2 | [EXAM NEWEST ACTUAL EXAM | | QUESTIONS AND CORRECT VERIFIED ANSWERS 100% GUARANTEED PASS! |GRADED At+ The traffic field technician is responsible for performing what types of maintenance on signals? - Correct Answer Preventive and Emergency The single most important focus for the traffic signal field technician is? - Correct Answer Safety Three main categories of safety a traffic signal technician is responsible for? - Correct Answer Safety of motorist and pedestrians His or her own personal safety Safety of public and personal property Traffic signal field technicians perform several maintenance and repair functions above the ground and roadway typically using what two vehicles? - Correct Answer Bucket Truck Aerial lift (platform truck) While using a bucket truck or aerial lift what implement provides proper protection for the user? - Correct Answer Protective Harness What responsibilities (liability) does a Traffic signal technician have while involved in repair, testing or maintenance? - Correct Answer Legal liability Dealing with the public It is imperative that the traffic signal field technician maintain comprehensive what of all the steps taken during repair and maintenance of traffic signals? - Correct Answer Documentation What two instances are documentation required for a traffic signal field technician? - Correct Answer Routine maintenance Emergency repair The "word" public usually represents the following individuals (4): - Correct Answer Road users Area residents / Property owners Elected and appointed officials The media Several means of public interaction are (3): - Correct Answer Mail or email Telephone contact Face to face meetings When dealing with the public, keep in mind that the routines of public users may be disrupted for periods of time during construction. How should a traffic signal field technician interact with the public? (5) - Correct Answer Always be polite Be confident when speaking Communicate clearly in understandable terminology Don't argue or threaten Don't provide information if you are uncertain of its accuracy. The NEMA TS-1 defined every pin for each connector as either what two connection types? - Correct Answer Input or Output NEMA also allowed manufactures to add an additional feature on the fourth connector. What was this connector know as? - Correct Answer D connector What was the D connector commonly used for? - Correct Answer Communications Pre-emption Other special features What three agencies joined together to help develop the 170 controller? - Correct Answer California DOT City of Los Angeles California New York State DOT What controller is an open-architecture based general purpose microcomputer for traffic control? - Correct Answer Model 170 controller What two specifications does the model 170 controller require? - Correct Answer A specific hardware architecture A specific processor How is the Type 179 controller specification similar to the 170 specification ?(2) - Correct Answer Open architecture Allows for interchangeability of components What is the primary difference between the 179 and 170 controller - Correct Answer Uses a different microprocessor Who developed the model 2070 controller? - Correct Answer CALTRANS The 2070 was introduced to supersede which controller? - Correct Answer The 170 controller Which controller is compatible regardless of the manufacturer? - Correct Answer The 2070 controller The 2070 provides more functionality than the 170 because of what features?(3) - Correct Answer Additional processing power Ability to program in higher level languages Multiple high speed communications ports Define the acronym NTCIP - Correct Answer National Transportation Communications for Intelligent transportation systems Protocol What is a set of standards established by the consortium for controllers, cabinets and other ITS devices? - Correct Answer The NTCIP The National Transportation Communication for ITS protocol was developed to accommodate what two things? - Correct Answer Needs of subsystems User Services How are "blank-out" signs illuminated? - Correct Answer Internally When are blank-out signs only activated? (2) - Correct Answer Specific times of day Specific events Several considerations must be made before actively engaging in work with a lift truck, these include (5): - Correct Answer Positioning if the vehicle in or adjacent to the roadway Establishing a temporary traffic control zone Verification of overhead conflicts Planning the work to be performed Using an approved safety harness Bucket trucks may have a boom that is capable of rotating and extending which is called? - Correct Answer Articulating boom What are some disadvantages of an aerial platform lift?(4) - Correct Answer Only extends vertically Cannot reach as high as boom trucks Must be parked on flat ground Must be positioned directly below work area. The primary purpose of the traffic signal monitor unit is to act as? - Correct Answer Guard against system malfunction If a malfunction is present the monitoring unit will automatically put the intersection into what mode? - Correct Answer Flashing condition An intersection will remain in flash mode until the monitor unit is? - Correct Answer Reset The CMU and MMU checks the controller for what two things? - Correct Answer Proper power Timing functions What will cause the monitor (CMU) to transfer the intersection into flash mode?(3) - Correct Answer Loss of power to the controller The 24 volt DC voltage of the controller is lost Time it takes to change from one indication to another is incorrect What does each conflict monitor have that is unique for that particular intersection - Correct Answer Program card What are short lengths of conductors on the program card called? - Correct Answer Jumpers On the program card jumpers are installed to tell the unit "what" are considered compatible?(2) - Correct Answer Movements Channels For NEMA type controllers positions not having jumpers are considered as? - Correct Answer Conflicts DC isolators What are the most common isolator cards? - Correct Answer Loop detector cards What are two other special purpose cards? - Correct Answer Video detector cards Emergency vehicle pre-emption Load switches in the controller cabinet receive 24V DC and switch (reroute) the 120V AC to the lamps in the signal head. This potentially reduces: (2) - Correct Answer The number of faults induced into the controller from outside the cabinet. Electrical surges Why do some agencies operate signals in full operation mode for a period of time, then switch to flashing mode? - Correct Answer To preserve the battery life Battery backup system manufactures claim that switching to red flashing operation at "what battery" level percent significantly extends run time? - Correct Answer 40% What type of backup power systems require significant manpower and monitoring during use? - Correct Answer Portable generator Intersections using LED displays use approximately what % of power that incandescent displays use? - Correct Answer 10% What piece of test equipment can be directly connected to many different traffic signal control equipment groups? - Correct Answer Laptop computer What are several of the functions a laptop computer can perform in relation to a traffic signal controller?(5) - Correct Answer Set up equipment Download operational parameters to the equipment Upload signal system software Upload traffic signal timing plans Set up video detection What are the two typical forms of interconnectivity for testing equipment? - Correct Answer Ethernet cable Serial communication cable What type of software program is typically used as a user interface? - Correct Answer Windows - based graphical user interface What is also known as volt/ohm meter or VOM - Correct Answer multi-meter What is an electronic measuring instrument that combines several functions into one unit? - Correct Answer multi-meter A standard multi-meter includes what three main measurement features? - Correct Answer Voltage Current Resistance A multi-meter provides the ability to measure?(3) - Correct Answer DC and AC voltage DC and AC current What is a unit that a signal technician uses to troubleshoot existing loops and test newly installed loops? - Correct Answer Loop Analyzer What does a loop analyzer measure?(5) - Correct Answer Frequency Relative strength Impedance Change in inductance when vehicle is present Resistance Define TDR? - Correct Answer Time domain reflectometer What is an electronic instrument used to characterize and locate faults in metallic cables? - Correct Answer TDR - time domain reflectometer Because of the sensitivity to impedance variations, a TDR may be used to: (3) - Correct Answer Verify cable impedance characteristics Splice and connector locations Estimate cable lengths What is a single sequence of displays that gives each movement at the intersection a chance to proceed through the intersection on a green indication? - Correct Answer Cycle What is the total number of seconds between the start of a specific display until that display comes up again called? - Correct Answer Cycle length In older electro-mechanical controllers the cycle is sometimes referred to as a? - Correct Answer Dial Describes the direction of approach and the maneuver made at the intersection? - Correct Answer (Vehicle) Movement Vehicle movements are usually recorded in a "what" that is typically included in the plans for a traffic signal? - Correct Answer Timing chart How are vehicle phases typically numbered? - Correct Answer 1 through 8 Which numbers in a vehicle phase a assigned to the through movements? - Correct Answer Even numbers Which numbers are assigned to the left turn movements in a vehicle phase? - Correct Answer Odd numbers Which phases are typically assigned to the major-street through movements? - Correct Answer 2 and 6 The through phases are numbered in which direction and start with which phase? - Correct Answer Clockwise direction Phase 2 An intersection that has four through phases and four protected left-turn phases is said to be an "what" intersection? - Correct Answer Eight-phase In a sequential series of phases how many phases are served at a time? - Correct Answer One What are used to provide signalization for specific movements that can be made while some of the other phases of the traffic signal cycle are being served? - Correct Answer Overlaps Overlaps are different from other phases because they cannot be? - Correct Answer Independently called into action There are two basic types of overlaps, known as what? - Correct Answer Independent Parent/child What type of signals have detectors and gap counters, and can skip phases? - Correct Answer Actuated The use of fully actuated instead of non-actuated coordinated phases can do what two things? - Correct Answer Better balance volume-to-capacity ratios Decrease split failures What phase allows left turning drivers to cross a conflicting traffic stream with care when there are adequate gaps in the opposing traffic flow? - Correct Answer Permissive left turn When are protected only left turns typically used ?(3) - Correct Answer High volume of through traffic More than two through lanes Intersection with constrained sight distance What phasing occurs when the left turn in one direction gets the left turn arrow before the opposing through movement gets the circular green, then the opposing left turn gets the green arrow after the opposing through is stopped? - Correct Answer Lead/lag left turn phasing What are the two types of flashing mode operation? - Correct Answer Yellow-red Red-red What can be planned for either scheduled late-night flashing or scheduled flashing of a signal that is only needed at certain times of the day or week, or emergency? - Correct Answer Flashing operation What mode causes flashing circular yellow indications to the major street approaches and flashing red indications are shown to the minor street approaches? - Correct Answer Yellow-red flashing mode Flashing red indications are shown to every approach lane to the intersection. This type of flashing operations essentially provides the same type of control as an all- way stop control. - Correct Answer Red-red flashing mode What traffic signal control function is typically enabled by an on-site user via a switch selected inside the police panel? - Correct Answer Stop time What term defines the minimum initial time that the minimum assured green is displayed? - Correct Answer Minimum green What is the period of time that the signal displays are red for all approaches? - Correct Answer All-red clearance This interval allows for the intersection to "what" before a green phase starts again? - Correct Answer Clear Factors used to determine the most appropriate time for an all red clearance include: - Correct Answer Type of vehicular traffic Driver characteristics Pedestrian activity in the intersection What is the establishment of a definite timing relationship between adjacent traffic signals? - Correct Answer Coordination timing Traffic signal coordination timings are developed to provide a degree of consistency that should allow traffic to? - Correct Answer Progress through a number of intersections without stopping What within traffic controllers allow for timing plans to transition from one to another gradually so that traffic is not severely disrupted? - Correct Answer Algorithms The amount of time that is allocated to a particular signal phase is the phases? - Correct Answer Split A split includes what three things associated with the phase? - Correct Answer Green time Yellow time Red time What is the transfer of the normal control of signals to a special signal control mode? - Correct Answer Preemption timing Preemption timing has the purpose of servicing? - Correct Answer Railroad crossings Emergency vehicle passage Mass transit vehicle passage Other special tasks Preemption timing control requires "what" of normal traffic control to provide the priority needs of a special task? - Correct Answer Terminating Transit preemption is often called what? - Correct Answer Transit Priority Transit priority can operate by two different techniques: - Correct Answer Green extension Red truncation What has the purpose of transferring the right of way to an emergency vehicle that needs to traverse an intersection? - Correct Answer Emergency vehicle preemption What are the two types of emergency vehicle preemptions? - Correct Answer Stationary Mobile 
