Week #? - Lighting Boards (aka Big Boards)

Question 1

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.

Answer 1

False

Question 2

True or False: A corroded light unit terminal could result in an increased voltage drop across the terminal.

Answer 2

True

Question 3

What type of filament is used in a halogen headlight?

Answer 3

Tungsten

Question 4

What type of headlight fires an arc through gas to produce light energy?

Answer 4

HID

Question 5

In a standard SAE relay, which of the following is normally open (NO)? a. 3 b. 4 c. 5 d. 7

Answer 5

c. 5

Question 6

Which of the following best defines light energy? a. heat b. protons c. photons d. electrons

Answer 6

c. photons

Question 7

How much voltage is required to sustain the arc in a typical HID headlamp assembly?

Answer 7

Around 85 volts

Question 8

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

Answer 8

c. charging system voltage regulator

Question 9

True or False: HID headlamps are brighter and their blue light is more similar to natural sunlight than that of halogen lamps.

Answer 9

True

Question 10

True of False: HID headlamps consume more electrical power than equivalent halogen headlamps.

Answer 10

False

Question 11

True or False: A corroded light unit terminal could result in heat at the terminal.

Answer 11

True

Question 12

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

Answer 12

d. tungsten filament encased in a quartz envelope

Question 13

In an older standard SAE relay, which pair of terminals energizes the coil circuit?

Answer 13

85 and 86

Question 14

How many contacts are in a typical tractor-to-trailer electrical connector?

Answer 14

7

Question 15

When an incandescent light bulb is energized in an electrical circuit, what is electrical energy converted to?

Answer 15

Heat and light

Question 16

What color code is used for the brake light circuit in a truck trailer electrical connector?

Answer 16

Red

Question 17

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.

Answer 17

False

Question 18

True or False: On a standard SAE relay, terminal 3 is always the common terminal.

Answer 18

True

Question 19

What is the maximum acceptable total voltage drop across all of the terminals and cables on the insulated side of a cranking circuit?

Answer 19

0.5 volt

Question 20

What would be used to switch turnlights on a truck chassis?

Answer 20

Stalk switch

Question 21

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.

Answer 21

False

Question 22

True or False: In a standard SAE relay, the coil circuit must be energized to close the normally open 5 terminal.

Answer 22

True

Question 23

What is the function of a headlamp dimmer switch?

Answer 23

Switches headlamps between separate low- and high-beam circuits

Question 24

Xenon headlamps are a disadvantage in trucks because they have a shorter service life than halogen bulbs.

Answer 24

False

Question 25

What governs highway truck exterior lighting standards in North American trucks?

Answer 25

FMVSS 108