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IMSA Traffic Signal I Practice Questions - IMSA Traffic Signal Technician Level I Certification Exam Exam
Practice mode
Question
1
of 25
QUESTION 1 / 25
What is the primary purpose of a traffic signal conflict monitor?
Choose one answer below.
A
To count the number of vehicles passing through the intersection
✓
B
To detect conflicting signal indications and place the intersection into flash mode
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C
To adjust signal timing based on traffic volume
✓
D
To communicate with adjacent intersections for coordination
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QUESTION 2 / 25
According to Ohm's Law, if a circuit has a voltage of 120 volts and a resistance of 60 ohms, what is the current?
Choose one answer below.
A
0.5 amps
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B
2 amps
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C
7,200 amps
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D
180 amps
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QUESTION 3 / 25
What does MUTCD stand for?
Choose one answer below.
A
Manual on Uniform Traffic Control Devices
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B
Municipal Unified Traffic Control Document
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C
Manual on Urban Traffic Control Design
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D
Municipal Utility and Traffic Control Directives
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QUESTION 4 / 25
What is the standard nominal voltage for traffic signal circuits in the United States?
Choose one answer below.
A
12 volts DC
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B
24 volts DC
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C
120 volts AC
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D
240 volts AC
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QUESTION 5 / 25
What type of detector is most commonly installed in the pavement surface at signalized intersections?
Choose one answer below.
A
Microwave radar detector
✓
B
Video image processor
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C
Inductive loop detector
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D
Infrared sensor
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QUESTION 6 / 25
In a standard 8-phase signal operation, which phases are typically assigned to the major street through movements?
Choose one answer below.
A
Phases 1 and 5
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B
Phases 2 and 6
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C
Phases 3 and 7
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D
Phases 4 and 8
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QUESTION 7 / 25
What is the primary purpose of lockout/tagout (LOTO) procedures in traffic signal maintenance?
Choose one answer below.
A
To prevent unauthorized changes to signal timing
✓
B
To protect workers from unexpected energization of equipment during maintenance
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C
To document which technician performed the work
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D
To prevent the public from accessing the signal cabinet
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QUESTION 8 / 25
What color is displayed during the pedestrian WALK interval?
Choose one answer below.
A
Flashing orange hand
✓
B
Steady white walking person symbol
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C
Flashing white walking person symbol
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D
Steady green walking person symbol
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QUESTION 9 / 25
What happens at an intersection when the traffic signal controller loses power?
Choose one answer below.
A
All signals display steady red
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B
All signals go dark and the intersection becomes uncontrolled
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C
The backup battery immediately takes over all signal operations
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D
The conflict monitor activates flashing yellow
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QUESTION 10 / 25
What is the unit of electrical resistance?
Choose one answer below.
A
Volt
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B
Ampere
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C
Ohm
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D
Watt
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QUESTION 11 / 25
A megohm meter (megger) is used to test what property of signal cable?
Choose one answer below.
A
Voltage drop across the conductor
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B
Current carrying capacity
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C
Insulation resistance
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D
Signal timing accuracy
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QUESTION 12 / 25
What is the function of the load switch in a traffic signal cabinet?
Choose one answer below.
A
To switch between primary and backup power sources
✓
B
To switch power to individual signal head indications based on controller commands
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C
To monitor for conflicting signal displays
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D
To control the flash transfer relay
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QUESTION 13 / 25
Which NEC article primarily addresses grounding and bonding requirements that apply to traffic signal cabinet and equipment installations?
Choose one answer below.
A
Article 100 — Definitions
✓
B
Article 250 — Grounding and Bonding
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C
Article 480 — Storage Batteries
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D
Article 590 — Temporary Installations
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QUESTION 14 / 25
What is the purpose of the yellow change interval in a traffic signal cycle?
Choose one answer below.
A
To allow pedestrians additional crossing time
✓
B
To warn approaching traffic that the green signal is ending and the red signal will soon be displayed
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C
To allow left-turning vehicles to clear the intersection
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D
To synchronize timing with adjacent intersections
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QUESTION 15 / 25
What does a pedestrian pushbutton do when pressed at a signalized intersection?
Choose one answer below.
A
Immediately changes the signal to green for the pedestrian's direction
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B
Places a call for a pedestrian phase in the controller's memory
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C
Activates an audible alarm to stop traffic
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D
Triggers emergency vehicle preemption
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QUESTION 16 / 25
In a series circuit with three resistors of 10, 20, and 30 ohms, what is the total resistance?
Choose one answer below.
A
5.45 ohms
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B
20 ohms
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C
60 ohms
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D
600 ohms
✓
QUESTION 17 / 25
What is the typical color arrangement for a vertical traffic signal head from top to bottom?
Choose one answer below.
A
Green, yellow, red
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B
Red, green, yellow
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C
Red, yellow, green
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D
Yellow, red, green
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QUESTION 18 / 25
What type of signal preemption system uses optical detectors mounted on or near signal heads?
Choose one answer below.
A
GPS-based preemption
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B
Siren-activated preemption
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C
Opticom (optical) preemption
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D
Radio frequency preemption
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QUESTION 19 / 25
What is the minimum number of signal heads the MUTCD requires for each approach to a signalized intersection?
Choose one answer below.
A
One
✓
B
Two
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C
Three
✓
D
Four
✓
QUESTION 20 / 25
What is the purpose of the red clearance interval?
Choose one answer below.
A
To provide additional time for vehicles to enter the intersection after the green
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B
To allow vehicles that entered during the yellow to clear the intersection before conflicting movements start
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C
To reset the controller for the next phase
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D
To test the conflict monitor
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QUESTION 21 / 25
What is the function of a flasher unit in a traffic signal cabinet?
Choose one answer below.
A
To provide steady-state power to all signal heads
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B
To provide alternating on/off power for flashing signal operations
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C
To monitor for voltage surges in the power supply
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D
To convert AC power to DC power for the controller
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QUESTION 22 / 25
What safety equipment should a technician wear when working inside an energized traffic signal cabinet?
Choose one answer below.
A
Steel-toed boots only
✓
B
Insulated gloves rated for the voltage present
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C
Standard work gloves and a hard hat
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D
A dust mask and ear protection
✓
QUESTION 23 / 25
What is the function of a detector amplifier in a traffic signal system?
Choose one answer below.
A
To increase the power output to signal heads
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B
To process the signal from a loop detector and send a call to the controller
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C
To amplify the audio output of audible pedestrian signals
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D
To boost communication signals between intersections
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QUESTION 24 / 25
Which type of power is calculated by multiplying voltage times current?
Choose one answer below.
A
Resistance
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B
Inductance
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C
Wattage (power)
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D
Capacitance
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QUESTION 25 / 25
What does the green arrow signal indication authorize?
Choose one answer below.
A
All traffic in any direction may proceed
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B
Traffic may cautiously proceed in any direction
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C
Traffic may proceed only in the direction indicated by the arrow
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D
Pedestrians may cross in the direction the arrow is pointing
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