Question 1

Most instrument panel display gauges are designed to display normal values in which areas of a circular display?

Accepted Answer

A)   12 to 4 o'clock
B)   10 to 2 o'clock
C)   3 to 9 o'clock
D)   4 to 8 o'clockE) B) and C)
F) None of the above

Question 2

With a truck ignition key-off and all electrical loads off,you disconnect the main ground battery cable and connect a test light in series with the battery ground clamp and the battery ground post.The test light illuminates and remains illuminated.What is the likely problem?

Accepted Answer

A)   Nothing
B)   Possible battery drain
C)   High resistance in the ground circuit
D)   Imminent battery failureE) B) and C)
F) A) and B)

Question 3

Where would you most likely find fluorescent lights on a truck?

Accepted Answer

A)   not used on vehicles
B)   headlights
C)   marker lights
D)   sleeper and bunk lightsE) None of the above
F) All of the above

Question 4

Technician A says that when replacing a tungsten lightbulb element,you should avoid touching the bulb with your bare hands.Technician B says that halogen headlights produce about twice as much brightness measure in candle power as incandescent headlights.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) All of the above
F) A) and B)

Question 5

What is the function of a tachometer?

Accepted Answer

A)   measures engine rpm
B)   measures road speed
C)   displays engine hours
D)   displays exhaust gas temperatureE) None of the above
F) A) and B)

Question 6

On a standard SAE relay,which two terminals are used to energize the coil or control circuit?

Accepted Answer

A)   1 and 2
B)   2 and 3
C)   3 and 4
D)   4 and 5E) A) and C)
F) None of the above

Question 7

Which of the following circuit protection devices tend to be most commonly used in truck chassis electrical circuits?

Accepted Answer

A)   blade fuses
B)   solid state
C)   cycling circuit breakers
D)   non-cycling circuit breakersE) C) and D)
F) B) and C)

Question 8

Why are LED light systems a major advantage on trailers equipped with ABS brakes?

Accepted Answer

A)   power for LED is sourced from ABS
B)   the PLC multiplex routes through LED circuit
C)   ABS logic controls LED light circuit
D)   LEDs require little power leaving more for the ABS during panic stopsE) A) and C)
F) All of the above

Question 9

What is the maximum brightness permitted in headlamps by current legislation?

Accepted Answer

A)   55,000 candle power
B)   75,000 candle power
C)   150,000 candle power
D)   200,000 candle powerE) A) and D)
F) None of the above

Question 10

What does the brown color code represent in a SAE/ATA standard 7-wire trailer connector cord?

Accepted Answer

A)   auxiliary
B)   brakes
C)   ground
D)   tail and license plate lightsE) A) and D)
F) B) and C)

Question 11

What is the main cause of HID headlamp failures?

Accepted Answer

A)   burned out filaments
B)   vibration of lamp assembly
C)   oxidation of electrodes
D)   loss of inert gasE) C) and D)
F) A) and D)

Question 12

Which of the following can significantly increase the life of all vehicle light systems?

Accepted Answer

A)   chassis voltage stabilizer
B)   increasing voltage regulator setting
C)   limiting alternator maximum speed
D)   replace at each PMIE) A) and B)
F) C) and D)

Question 13

What maximum temperatures do the tungsten filaments in incandescent bulbs heat to in normal operation?

Accepted Answer

A)   110 degrees Fahrenheit
B)   1500 degrees Fahrenheit
C)   2500 degrees Fahrenheit
D)   over 4000 degrees FahrenheitE) A) and B)
F) None of the above

Question 14

When soldering copper wire in medium gauge truck electrical circuits,what should be used to produce the heat?

Accepted Answer

A)   use cold melt solder only
B)   100 watt soldering gun
C)   500 watt soldering iron
D)   propane torchE) B) and C)
F) All of the above

Question 15

When adjusting headlights without the aid of a headlight aiming device,what should be the distance between the front of the truck and the target screen?

Accepted Answer

A)   10 feet
B)   25 feet
C)   50 feet
D)   100 feetE) A) and D)
F) A) and C)

Question 16

After the arc has been ignited in a Xenon light,how much voltage is required to maintain it?

Accepted Answer

A)   20,000 volts
B)   85 volts
C)   12 volts
D)   5 voltsE) A) and D)
F) C) and D)

Question 17

What is the function of a pyrometer?

Accepted Answer

A)   records chassis service hours
B)   measures exhaust gas temperature
C)   displays engine speed
D)   indicates boost pressureE) A) and D)
F) None of the above

Question 18

A driver complains that his trailer marker lights continually cycle on-and-off,being illuminated for a couple of minutes,then quit for up to five minutes.What type of circuit protection device is likely installed in the trailer marker light circuit?

Accepted Answer

A)   blade type fuse
B)   ballast resistor
C)   SAE #1 circuit breaker
D)   SAE #2 circuit breakerE) B) and C)
F) B) and D)

Question 19

What is used to ignite the arc in a florescent light?

Accepted Answer

A)   spark
B)   heating element
C)   ballast resistor
D)   terminating resistorE) A) and B)
F) A) and C)

Question 20

Technician A says that a properly functioning LED light should produce mosty light energy from the electrical energy it consumes.Technician B says that light systems that produce the least amount of heat are the most efficient.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) A) and B)
F) None of the above

Exam 10: Chassis Electrical Circuits

Where would you most likely find fluorescent lights on a truck?

Correct AnswerverifiedShow Answer

Which of the following can significantly increase the life of all vehicle light systems?

Correct AnswerverifiedShow Answer

When adjusting headlights without the aid of a headlight aiming device,what should be the distance between the front of the truck and the target screen?

Correct AnswerverifiedShow Answer

What does the brown color code represent in a SAE/ATA standard 7-wire trailer connector cord?

Correct AnswerverifiedShow Answer

What is the function of a tachometer?

Correct AnswerverifiedShow Answer

What maximum temperatures do the tungsten filaments in incandescent bulbs heat to in normal operation?

Correct AnswerverifiedShow Answer

What is the maximum brightness permitted in headlamps by current legislation?

Correct AnswerverifiedShow Answer

What is used to ignite the arc in a florescent light?

Correct AnswerverifiedShow Answer

Technician A says that when replacing a tungsten lightbulb element,you should avoid touching the bulb with your bare hands.Technician B says that halogen headlights produce about twice as much brightness measure in candle power as incandescent headlights.Who is correct?

Correct AnswerverifiedShow Answer

Technician A says that a properly functioning LED light should produce mosty light energy from the electrical energy it consumes.Technician B says that light systems that produce the least amount of heat are the most efficient.Who is correct?

Correct AnswerverifiedShow Answer

After the arc has been ignited in a Xenon light,how much voltage is required to maintain it?

Correct AnswerverifiedShow Answer

On a standard SAE relay,which two terminals are used to energize the coil or control circuit?

Correct AnswerverifiedShow Answer

With a truck ignition key-off and all electrical loads off,you disconnect the main ground battery cable and connect a test light in series with the battery ground clamp and the battery ground post.The test light illuminates and remains illuminated.What is the likely problem?

Correct AnswerverifiedShow Answer

When soldering copper wire in medium gauge truck electrical circuits,what should be used to produce the heat?

Correct AnswerverifiedShow Answer

What is the function of a pyrometer?

Correct AnswerverifiedShow Answer

Which of the following circuit protection devices tend to be most commonly used in truck chassis electrical circuits?

Correct AnswerverifiedShow Answer

Most instrument panel display gauges are designed to display normal values in which areas of a circular display?

Correct AnswerverifiedShow Answer

What is the main cause of HID headlamp failures?

Correct AnswerverifiedShow Answer

Why are LED light systems a major advantage on trailers equipped with ABS brakes?

Correct AnswerverifiedShow Answer

A driver complains that his trailer marker lights continually cycle on-and-off,being illuminated for a couple of minutes,then quit for up to five minutes.What type of circuit protection device is likely installed in the trailer marker light circuit?

Correct AnswerverifiedShow Answer

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