basic electrical 1
what is the maximun acceptable total voltage drop across all of the terminals and cables in a cranking circuit?
0.5 volts
in a standard SAE relay, which of the following in normally open(no)?
5
in an older standard SAE relay, which pair of terminals energizes the coil circuit?
85 & 86
how much voltage is required to sustain the arc in a typical HID headlamp assembly?
around 85 volts
Technician A says that a corroded light unit terminal could result in an increased voltage drop across the terminal.Technician B says that a correded light unit terminal could result in heat at the terminal. Who is correct?
both A and B
Technician A says that on a stanard SAE relay, terminal 3 is always the common terminal. Technician B says in a stanard SAE relay, the coil circuit must be energized to close the normally open 5 terminal. Who is correct?
both A and B
when truck and trailer clearence lights and headlamps seem to burn out at a high rate, which of the following would be a required step in troubleshooting?
charging system voltage regulator
which of the following governs highway truck exterior lighting standards in north american trucks?
fmvss 108
which of the following would be used to switch turn lights on a truck chassis?
stack switch
what is the function of a headlight dimmer switch?
switches headlamps between separate low - and high - beam circuits
what type of filament is used in a halogen headlight?
tungsten
which of the folloing best explains the construction of a halogen headlamp element?
tungsten filament encased in a quartz envelope
when an incandescent light bulb is energized in a 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
how many contacts are in a typical tractor - to trailer electrical connector?
seven
what type of headlight fires an arc through gas to produce light energry?
HID (high intensity discharge)
Technician a says that HID headlamps consume more electrical power than equivalent halogen headlamps. Technician B says that HID headlamps are brighter and their blue light is more simiar to natural sunlight than that of halogen lamps. Who is correct?
Technician B only
Technician A says that a disadvantage of using LEDs as stoplights is that when the circuit is switched on, they illuminate at a slower speed than incandescent bulbs. Technician B says that xenon headlights are a disadvantage in trucks because they have a shorter servicelife than halogen bulbs.Who is correct?
neither A nor B
the headlights on a truck continually illminate for a short period and then cut out. Technician A says that if the circuit breaker is a type 1, replacing it with a type 2 should repair the problem. Technician B says that the problem is likely caused by a malfunction in a type -2 -circuit breaker. Who is correct?
neither A nor B
which of the following best defines light energy?
photons
