Truck Electrical Circuit Fundamentals -Part A 190404aA Flashcards
Truck lighting circuits provide illumination. List four purposes that these lighting circuits serve.
- Assist driver vision during night operation and poor visibility conditions.
Two types of circuit breakers are discussed in this module: Type 1 and type 2. Explain why type 2 circuit breakers come equipped with a heat-producing resistor.
The resistor holds the circuit breaker in the off position. While the breaker rating is exceeded, the electrical circuits overload condition must be repaired and the circuit breaker cooled before the Type 2 circuit breaker will return to the off position.
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
If the fiber optic dash illumination system fails, what is most likely the malfunctioning component?
If the fiber optic dash illumination system fails, most likely the system’s light source has failed.
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 and audible backup warning beeper.
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
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.
reduce electrical noise
A truck has a malfunctioning electrical horn. Which of the following indicates the correct basic troubleshooting steps?`
a. check the fuse, check the ground, check 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.
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.
From what electrical terminal does the low beam headlight circuit receive electrical power?
a. ignition switched power
b. constant power terminal
c. safety power terminal
d. high power terminal
b. constant power terminal
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.
The turn signal light circuit has a turn signal flasher connected to it’s 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
A truck equipped with a LED turn signals 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?
LED bulbs don’t draw enough current to heat up the electromechanical flasher as long. The result will be the lights flashing more rapidly with LED.
What are the two advantages of programming PTO parameters into the engine ECM?
The first advantage is creating customized parameters for the PTO operation in order to optimize the PTO function of the truck. the second is the ECM creates a report of the PTO on time and fuel usage. Owners can use this for a rebate on fuel road tax.
What sensor does a collision avoidance system use to detect the vehicle is moving around a curve?
a. global positioning sensor.
b. gyro sensor
c. accelerometer
d. potentiometer
Potentiometer
