Week #? - Lighting Boards (aka Big Boards) Flashcards
True or False: A disadvantage of using LEDs as stoplights is that when the circuit is switched on, they illuminate at a slower speed than incandescent bulbs.
False
True or False: A corroded light unit terminal could result in an increased voltage drop across the terminal.
True
What type of filament is used in a halogen headlight?
Tungsten
What type of headlight fires an arc through gas to produce light energy?
HID
In a standard SAE relay, which of the following is normally open (NO)? a. 3 b. 4 c. 5 d. 7
c. 5
Which of the following best defines light energy? a. heat b. protons c. photons d. electrons
c. photons
How much voltage is required to sustain the arc in a typical HID headlamp assembly?
Around 85 volts
When truck and trailer clearance lights and headlamps seem to burn out at a high rate, which of the following would be a required sstep in troubleshooting? a. battery state of charge b. battery surface charge c. charging system voltage regulator d. voltage losses in ground circuit
c. charging system voltage regulator
True or False: HID headlamps are brighter and their blue light is more similar to natural sunlight than that of halogen lamps.
True
True of False: HID headlamps consume more electrical power than equivalent halogen headlamps.
False
True or False: A corroded light unit terminal could result in heat at the terminal.
True
Which of the following best explains the construction of a halogen headlamp element? a. electrodes and arc igniter b. inert gas in a tube c. tungsten filament encased in a fluorescent tube d. tungsten filament encased in a quartz envelope
d. tungsten filament encased in a quartz envelope
In an older standard SAE relay, which pair of terminals energizes the coil circuit?
85 and 86
How many contacts are in a typical tractor-to-trailer electrical connector?
7
When an incandescent light bulb is energized in an electrical circuit, what is electrical energy converted to?
Heat and light
What color code is used for the brake light circuit in a truck trailer electrical connector?
Red
True or False: The headlights on a truck with electromechanical controls and circuit breaker protection continuously illuminates for a short period and then cut out. The Technician says that the problem is likely caused by a malfunction in a type-2 circuit breaker.
False
True or False: On a standard SAE relay, terminal 3 is always the common terminal.
True
What is the maximum acceptable total voltage drop across all of the terminals and cables on the insulated side of a cranking circuit?
0.5 volt
What would be used to switch turnlights on a truck chassis?
Stalk switch
True or False: The headlights on a truck with electromechanical controls and circuit breaker protection continuously illuminates for a short period and then cut out. The Technician says that if the circuit breaker is a type 1, replacing it with a type 2 should repair the problem.
False
True or False: In a standard SAE relay, the coil circuit must be energized to close the normally open 5 terminal.
True
What is the function of a headlamp dimmer switch?
Switches headlamps between separate low- and high-beam circuits
Xenon headlamps are a disadvantage in trucks because they have a shorter service life than halogen bulbs.
False
What governs highway truck exterior lighting standards in North American trucks?
FMVSS 108
