IMSA level 1 Certification 2024-2025. Questions and Correct Answers. Graded A+, Exams of Engineering

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IMSA level 1 Certification 2024-2025.

Questions and Correct Answers. Graded A+

____ assemblies provide the maximum support length to cross over a street? - ANSTruss type assemblies. __________ are used to warn the traveling public of any changes or work on the road ahead, they are also known as variable/dynamic message signs? - ANSChangeable message signs 12" signal heads can be used without side a pole support heads on a ____ to a _____ intersection? - ANSMinimum 40 foot maximum 120 foot intersection. A loop detector sends a message to the controller's input file because it ____ (increases or decreases) the inductance frequency. - ANSDecreases A loop detector that is made up of two long rectangles right next to each other is called a ___? - ANSQuadrupole loop Are pull/ junction boxes only used where wire needs to change direction? - ANSNo At most intersections what are phases 2,6 called, and phases 4,8 called - ANSPhases 2,6 are called Main Street, and 4,8 are called side street. Can you get your level III certification and what are they? - ANSYes, and it's for bench and field electrician

Explain the white walking man, the flashing orange hand on a ped head and how is this time figured? - ANSThe white walking man is the ped head walk interval, and the ped change clearance interval is the flashing orange hand. For one to maintence_____ you must close the lane of travel. - ANSLoop detectors I have a dual ring controller and all my through phases are even, what do I mean?

• ANSThe dual ring phases are 2,4,6, I'm working near power lines where would I get my clearance from? - ANSCEC, NEC, NESC If I ask for some #10 AWG wire, what does AWG stand for? - ANSAmerican Wire Gauge If phase 2 is in recall what will the controller do? - ANSThe controller will service that phase even if there is no need for it. List three ways Doppler microwave detectors can check for vehicles? - ANSVolume, occupancy, classification Long life and low power consumption is a major advantage for _____ lamps? - ANSLEDs Name the three traffic signal systems? - ANSClosed loop, central computer, hybrid systems.

Signal heads that are _________ are to only be seen from a specific area on the road? - ANSVisibility limited. Span conductor wires are exposed to the weather 24/7? T or f? - ANSTrue The ___ wire keeps signal heads from swinging in the wind? - ANStether The a.d.a of 1990 ensures no discrimination against people who have disabilities?

• ANSTrue. The controller in a coordinated plan has a call on the side street what can it do to service that call? - ANSIt can use the force off command to end the current phase to service the side street. The last step before an intersection is ready for ____ is to have the inspectors, local agencies, and the contractor meet for the final okay. - ANSStop and go operation There are __ (Two or three) turns of wire in a standard loop that is 6' x 20' - ANSThree What are the three basic types of beacons? - ANSStop sign beacon, warning beacon, and flashing beacon. What are the two indications on a ped head and their colors? - ANSWalking man - white, upraised hand - Portland orange

What happens after the green interval and before the red interval, and how is this change interval figured? - ANSYellow interval, and is figured by using the approach speed of the traffic. What is a flashing signal along the road called? - ANSA flashing beacon. What is an offset? - ANSThe time it takes from the start of the green interval in a coordination timed intersection and a system reference point along side the road. What is the cheapest way to coordinate a corridor of signals? What needs to stay the same throughout the day? - ANSTime based coordination, and cycle length. What is the definition of short term work zone as per the MUTCD? - ANS1 hour or less What is the difference between concurrent and sequential phases? - ANSConcurrent phases, phases that run together. Sequential phases, are phases that run one at a time. What is the disadvantage of a span intersection? - ANSTaller support poles. What is the disadvantage of mast arm supports? - ANSHigher cost. What is the minimum number is heads for Main Street direction? - ANSMust have a minimum of 2 signal heads.

What is the the voltage that a traffic signal cabinet needs to run all its components? - ANS120 volts AC What is used to shade signal indications from the sun and allow it be seen from the lane intended? - ANSVisors. What makes up the green interval? - ANSInitial green time, passage/extension/gap time, and max green time. What's OSHA? - ANSOccupational and safety health administration Where are you when you come across a signal that has a ped pole on each side of the road, each having a 3 section signal on top followed with a 2 section mounted directly under neath? - ANSA ramp meter on a ramp to a highway. Where are you when you install alternating flashing 12" red lights? - ANSAt a railroad crossing. Who determins the the standards on traffic control devices and sets the requirements for uniformity? - ANSThe Manual on uniform traffic control devices, (MUTCD). Would a solar detector be a common way to detect for traffic at a traffic signal? Yes or no? - ANSNo You can use the same type signal head _______ on a mast arm and truss supports? - ANSMounting hardware.