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IMSA Roadway Lighting II Practice Questions - IMSA Roadway Lighting Technician Level II Certification Exam Exam
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Question
1
of 25
QUESTION 1 / 25
When performing a lighting design calculation using the lumen method, which formula determines the average maintained illuminance on a roadway?
Choose one answer below.
A
Illuminance = Wattage / Area
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B
Illuminance = (Lumens × CU × LLF) / Area
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C
Illuminance = Voltage × Current
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D
Illuminance = Candelas / Distance²
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QUESTION 2 / 25
What is the 'Coefficient of Utilization' (CU) in roadway lighting design?
Choose one answer below.
A
The percentage of electricity used by the lamp
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B
The ratio of lumens reaching the roadway surface to the total lumens produced by the luminaire
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C
The utility company's billing rate
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D
The number of luminaires per circuit
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QUESTION 3 / 25
In photometric analysis, what does an isolux diagram show?
Choose one answer below.
A
The electrical wiring layout
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B
Lines of equal illuminance on the roadway surface, showing the light distribution pattern
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C
The pole foundation details
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D
The circuit breaker schedule
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QUESTION 4 / 25
What is the 'IES file' format used in roadway lighting design software?
Choose one answer below.
A
An image file showing the luminaire photo
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B
A standardized electronic file containing the luminaire's photometric data (candela distribution)
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C
A warranty document
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D
A maintenance schedule template
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QUESTION 5 / 25
What is an LED driver's 'constant current' operating mode?
Choose one answer below.
A
The driver supplies a fixed voltage regardless of the LED load
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B
The driver maintains a fixed current output (in milliamps) to the LED array regardless of voltage variations
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C
The driver operates only at maximum brightness
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D
The driver turns on and off at regular intervals
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QUESTION 6 / 25
What is the difference between a DALI and a 0-10V dimming control system?
Choose one answer below.
A
They are identical systems with different names
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B
DALI is a digital protocol allowing individual addressing and bidirectional communication; 0-10V is an analog signal providing simple one-directional dimming
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C
0-10V is more expensive and complex than DALI
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D
DALI can only dim to 50% while 0-10V can dim to 0%
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QUESTION 7 / 25
What is the primary advantage of DALI control in a roadway lighting management system?
Choose one answer below.
A
It requires less wiring than any other system
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B
Each luminaire can be individually addressed, monitored, and controlled, enabling fault reporting, dimming profiles, and energy optimization
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C
It eliminates the need for power conductors
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D
It only works with HPS lamps
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QUESTION 8 / 25
What is the maximum number of devices (drivers/ballasts) allowed on a single DALI bus?
Choose one answer below.
A
16
✓
B
32
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C
64
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D
256
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QUESTION 9 / 25
How does 0-10V dimming control the light output of an LED luminaire?
Choose one answer below.
A
By changing the color temperature
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B
By varying a DC control voltage between 0V (minimum/off) and 10V (full brightness) on a separate control wire pair
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C
By switching the luminaire on and off rapidly
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D
By adjusting the frequency of the AC power
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QUESTION 10 / 25
What is the formula for calculating voltage drop in a single-phase AC circuit?
Choose one answer below.
A
Vd = Power / Current
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B
Vd = (2 × L × I × R) / 1000, where L is one-way distance in feet, I is current in amps, and R is resistance per 1000 feet
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C
Vd = Voltage × Current
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D
Vd = Watts / Volts
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QUESTION 11 / 25
A 240V roadway lighting circuit serves 20 LED luminaires (50W each) at a total distance of 2,000 feet using #6 AWG copper conductors (R = 0.491 ohms/1000ft). What is the approximate voltage drop?
Choose one answer below.
A
2.4 volts
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B
8.2 volts
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C
24 volts
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D
48 volts
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QUESTION 12 / 25
What is the primary purpose of a power distribution panel in a large roadway lighting system?
Choose one answer below.
A
To generate electricity for the lighting system
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B
To receive utility power and distribute it to multiple branch circuits with individual overcurrent protection
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C
To dim all luminaires simultaneously
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D
To store backup power
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QUESTION 13 / 25
What is the purpose of metering in a roadway lighting power system?
Choose one answer below.
A
To control the luminaire brightness
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B
To measure and record electrical energy consumption for billing, monitoring, and energy management
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C
To provide surge protection
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D
To control the photocontrol
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QUESTION 14 / 25
What is 'energy management' in the context of roadway lighting?
Choose one answer below.
A
Simply turning off all lights to save energy
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B
Systematic strategies including dimming schedules, adaptive controls, efficient luminaires, and monitoring to optimize energy use while maintaining safety
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C
Using the highest wattage luminaires available
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D
Running lights only one hour per night
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QUESTION 15 / 25
What is the purpose of part-night dimming in roadway lighting energy management?
Choose one answer below.
A
To test the dimming system only
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B
To reduce light levels during low-traffic overnight hours to save energy while maintaining adequate safety lighting
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C
To turn all lights completely off at midnight
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D
To increase brightness during peak traffic hours
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QUESTION 16 / 25
What unique lighting challenge does tunnel lighting present?
Choose one answer below.
A
Tunnels require no lighting
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B
The extreme contrast between bright daylight outside and the dark tunnel interior requires a transition zone with very high illumination at the entrance that gradually reduces deeper into the tunnel
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C
Tunnel lighting is identical to roadway lighting
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D
Tunnels only need emergency lighting
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QUESTION 17 / 25
What are the standard lighting zones in a tunnel lighting design?
Choose one answer below.
A
Only entrance and exit zones
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B
Access zone, threshold zone, transition zone, interior zone, and exit zone
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C
Dark zone and light zone
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D
Only the interior zone
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QUESTION 18 / 25
What is 'counter-beam' lighting in tunnel applications?
Choose one answer below.
A
Lighting that opposes the traffic flow direction
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B
A technique where luminaires are aimed against the direction of traffic to illuminate the front faces of vehicles and objects, improving their visibility to approaching drivers
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C
Using beams of light to count vehicles
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D
A method of blocking light from entering the tunnel
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QUESTION 19 / 25
What is the typical illuminance level required in the threshold zone of a tunnel compared to the interior zone?
Choose one answer below.
A
The same level throughout
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B
10 to 100 times higher in the threshold zone than in the interior zone
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C
Half the interior zone level
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D
Threshold zone requires no lighting
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QUESTION 20 / 25
What special consideration applies to bridge lighting design?
Choose one answer below.
A
Bridges require no special lighting considerations
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B
Vibration from traffic, wind exposure, marine environment corrosion, limited access for maintenance, and avoiding light interference with navigation
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C
Bridge lighting is the same as standard roadway lighting
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D
Only decorative lighting is needed on bridges
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QUESTION 21 / 25
What is the purpose of underpass lighting?
Choose one answer below.
A
To light the roadway above the overpass only
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B
To illuminate the roadway beneath an overpass structure where the structure blocks ambient light and creates a dark area during daytime and nighttime
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C
To provide lighting for pedestrians on the bridge deck
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D
To illuminate the structural supports for inspection
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QUESTION 22 / 25
What is high-mast lighting and where is it typically used?
Choose one answer below.
A
Standard 30-foot pole lighting on local streets
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B
Lighting mounted on poles 80-150+ feet tall using multiple luminaires, typically at highway interchanges, large intersections, and expansive areas
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C
Temporary construction lighting
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D
Solar-powered pathway lighting
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QUESTION 23 / 25
What is the lowering device on a high-mast lighting pole?
Choose one answer below.
A
A ladder system
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B
A motorized winch and cable system that lowers the luminaire ring to ground level for maintenance
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C
An elevator
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D
A hydraulic jack at the base
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QUESTION 24 / 25
What safety concern is unique to high-mast pole inspections?
Choose one answer below.
A
Low voltage hazards only
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B
Fatigue cracking at the base plate weld, anchor bolt corrosion, and structural failure risk due to the extreme height and wind loading
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C
Vandalism only
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D
Photocontrol failure only
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QUESTION 25 / 25
What is an 'adaptive lighting control' system?
Choose one answer below.
A
A system that uses only photocells for on/off control
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B
A system that automatically adjusts light levels based on real-time conditions such as traffic volume, weather, ambient light, and time of day
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C
A system that never changes light levels
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D
A system that only works with HPS lamps
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