ISMA Traffic Signal Technician II Latest Update 2024-2025 275 Questions and Verified Correct Answers Guaranteed A+ A forerunner of the electronic controllers that we have today was the? - CORRECT
ANSWER: Electro-mechanical controller
A microprocessor takes appropriate action to control intersection what? - CORRECT
ANSWER: Timing
A multi-meter provides the ability to measure?(3) - CORRECT ANSWER: DC and AC
voltage DC and AC current Resistance
A split includes what three things associated with the phase? - CORRECT ANSWER:
Green time Yellow time Red time
A standard multi-meter includes what three main measurement features? - CORRECT
ANSWER: Voltage
Current Resistance
Advanced loops are usually square point loop detectors that are placed? - CORRECT
ANSWER: Upstream from the stop line
Ammeters are also known as?(5) - CORRECT ANSWER: Clamp-on ammeter
Amprobe Clamp meter Current probe Tong tester
An inductive loop assembly consist of? - CORRECT ANSWER: Detector amplifier
Lead in cable Insulated loop wire Shallow slot sawed in pavement
An intersection that has four through phases and four protected left-turn phases is said
to be an "what" intersection? - CORRECT ANSWER: Eight-phase
An intersection will remain in flash mode until the monitor unit is? - CORRECT
ANSWER: Reset
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Analog multi-meter functions:(3) - CORRECT ANSWER: Low impedance Fast meter reaction time(measurement time) Provides a quick go or no-go indication
As sensitivity is increased a loop detector has a tendency to do what? - CORRECT
ANSWER: "Lock" or place a constant call
Battery backup system manufactures claim that switching to red flashing operation at "what battery" level percent significantly extends run time? - CORRECT ANSWER: 40%
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
Bucket trucks may have a boom that is capable of rotating and extending which is
called? - CORRECT ANSWER: Articulating boom
Controllers typically have what two types of ring operation? - CORRECT ANSWER:
Single Dual
Define TDR? - CORRECT ANSWER: Time domain reflectometer
Define the acronym NTCIP - CORRECT ANSWER: National Transportation
Communications for Intelligent transportation systems Protocol
Describes the direction of approach and the maneuver made at the intersection? -
CORRECT ANSWER: (Vehicle) Movement
Dial-up modems provide what in relation to the transition of data? - CORRECT
ANSWER: Reliability
Efficiency
Digital multi-meter functions:(5) - CORRECT ANSWER: High input impedance Automatic ranging of measurements Automatic polarity identification Sample and hold circuitry Provides a greater number of testing functions
Each vehicular phase is usually comprised of three specific intervals: - CORRECT
ANSWER: Green interval
Yellow change interval Red clearance interval
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Emergency vehicles should be set to which level of priority? - CORRECT ANSWER:
Medium priority
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
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
FMCW microwave detectors can detect "what" in addition to volume, occupancy,
classification and speed? - CORRECT ANSWER: Vehicle presence
For NEMA type controllers positions not having jumpers are considered as? -
CORRECT ANSWER: Conflicts
How are "blank-out" signs illuminated? - CORRECT ANSWER: Internally
How are vehicle phases typically numbered? - CORRECT ANSWER: 1 through 8
How do dial up modems function? - CORRECT ANSWER: Data transmitted to the dial-
up line, then over telephone company's infrastructure back to the central computer
How does a mobile emergency preemption operate? - CORRECT ANSWER:
Transmitter located in the emergency vehicle Receiver located at the intersections
How is advanced loop placement calculated using what factors? - CORRECT
ANSWER: Speed of the vehicles approaching the intersection
Safe stopping distance
How is stationary emergency vehicle preemption typically activated - CORRECT
ANSWER: When an emergency responder depresses a pushbutton located within the
facility .
How is the preemption input activated typically? - CORRECT ANSWER: When the
transmitter gets close enough to the receiver for the emitted signal to be detected by the receiver.
How is the Type 179 controller specification similar to the 170 specification?(2) -
CORRECT ANSWER: Open architecture
Allows for interchangeability of components
How many seconds for a major street through phase? - CORRECT ANSWER: 15 to 25
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