404aA Truck Electrical Circuit Fundamentals - Part A Flashcards
Truck lighting circuits provide illumination. List four (4) purposes that these lighting circuits serve.
- assist driver vision during night operation and poor visibility conditions
- truck safety
- driver convenience
- truck appearance
Another name for the constant power terminal is:
a) ignition switched terminal.
b) powered at all times terminal.
c) safety power terminal.
d) high power terminal.
b) powered at all times terminal
Two (2) types of circuit breakers are discussed in this module: Type I and Type II. Explain why Type II circuit breakers come equipped with a heat-producing resistor.
This resistor holds the circuit breaker in the OFF (open) position while the breaker rating is exceeded. The electrical circuit’s overload condition must be repaired and the circuit breaker cooled before the Type II circuit breaker will return to the ON (closed) position.
From which electrical terminal does the low beam headlight circuit receive electrical power?
a) ignition switched terminal
b) constant power terminal
c) safety power terminal
d) high power terminal
b) constant power terminal
Which switch controls the truck and trailer clearance/marker and tail light circuit?
a) dimming switch
b) dash mounted clearance light/marker and tail light switch
c) headlight dimming switch
d) master lighting switch
d) master lighting switch
The intensity of the dash panel lights can be controlled by a:
a) series connected rheostat.
b) pulse width modulated signal.
c) SPST switch.
d) both a and b
d) both a and b
If the fibre optic dash illumination system fails, what is most likely the malfunctioning component?
If the fibre optic dash illumination system fails, most likely the system’s light source has failed.
The turn signal light circuit has a turn signal flasher connected in its circuit. How is the turn signal flasher connected in this circuit?
a) series connection
b) parallel connection
c) series-parallel connection
d) open connection
a) Series connection
What other truck electrical accessory device can be controlled by the same switching system that controls the truck backup light circuit?
The same switching system that controls the truck backup light circuit can also control an audible backup warning beeper.
A truck equipped with LED turn signal and brake lights must have a solid state electronic flasher to flash properly. Why does an electromechanical signal light flasher not flash LED turn signal lights properly?
The LED turn signal light does not draw enough electric current to allow an electromechanical signal light flasher to operate LED turn signals properly.
A solenoid is an electromagnetic device that changes electrical energy into:
a) wave motion.
b) linear motion.
c) circular motion.
d) rotary motion.
b) linear motion.
What are the two (2) advantages of programming PTO parameters into the engine ECM?
The first advantage is that you can create customized parameters for the PTO operation in order to optimize the PTO function of the truck. The second is that the ECM creates a report of PTO time and fuel usage. Owners can use this information and apply for a tax rebate on the road portion of the fuel tax they pay when purchasing fuel.
The purpose of connecting a parallel-connected capacitor into a truck’s electrical system is to:
a) increase available voltage to electrical accessories.
b) increase the CMEF of dc motors.
c) reduce electrical noise.
d) reduce the size of the cab ground strap cable.
c) To reduce electrical noise
What sensor does a collision avoidance system use to detect that the vehicle is traveling around a curve?
a) Global Positioning Sensor
b) gyro sensor
c) accelerometer
d) potentiometer
b) gyro sensor
A truck has a malfunctioning electrical horn. Which of the following indicates the correct basic troubleshooting steps?
a) Check the fuse, check the ground and test the relay.
b) Check the fuse, check the ground and replace the relay.
c) Replace the fuse, check the ground and test the relay.
d) Replace the fuse, replace the ground and replace the relay.
a) Check the fuse, check the ground and test the relay.
