Lighting Boards (big boards)

Question 1

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

Answer 1

heat and light

Question 2

What is the function of a headlamp dimmer switch?

Answer 2

switches headlamps between separate low-and high-beam circuits

Question 3

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

Answer 3

HID

Question 4

Which of the following best explains the construction of a halogen headlamp element?

Answer 4

tungsten filament encased in a quartz envelope

Question 5

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

Answer 5

around 85 volts

Question 6

Which of the following best defines light energy?

a. heat b. photons c. electrons d. protons

Answer 6

photons

Question 7

Which of the following would be used to switch turn lights on a truck chassis?
a. stalk switch b. headlamp switch c. brake pressure switch d. toggle switch

Answer 7

stalk switch

Question 8

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

Answer 8

seven

Question 9

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

Answer 9

red

Question 10

When truck and trailer clearance lights and headlamps seem to burn out at a high rate, which of the following would be a required step in troubleshooting?
a. voltage losses in ground circuit b. battery state of charge c. battery surface charge d. charging system voltage regulator

Answer 10

charging system voltage regulator

Question 11

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

Answer 11

FMVSS 108

Question 12

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

Answer 12

5

Question 13

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

Answer 13

85 and 86

Question 14

The headlights on a truck with electromechanical controls and circuit breaker protection continuously illuminates 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?

Answer 14

Neither A nor B

Question 15

Technician A says that on a standard SAE relay, terminal 3 is always the common terminal. Technician B says that in a standard SAE relay, the coil circuit must be energized to close the normally open 5 terminal. Who is correct?

Answer 15

Both A and B

Question 16

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

Answer 16

0.5 volt

Question 17

Technician A says that a corroded light unit terminal could result in an increased voltage drop across the terminal. Technician B says that a corroded light unit terminal could result in heat at the terminal. Who is correct?

Answer 17

Neither A nor B

Question 18

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 headlamps are a disadvantage in trucks because they have a shorter service life than halogen bulbs. Who is correct?

Answer 18

Neither A nor B

Question 19

What type of filament is used in a halogen headlight?

Answer 19

tungsten

Question 20

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 similar to natural sunlight than that of halogen lamps. Who is correct?

Answer 20

Technician B only