chapter 14
A diode is a semiconductor device that ________.
Causes voltage spikes /Blocks current in one direction
Blocks current in both direction/ Reverses current flow
Blocks current in one direction
The ratio of on time relative to the period of the complete cycle is the ________.
Duty cycle / Pulse width modulation
Frequency / Amplitude
Duty Cycle
Technician A says that module communications networks are used to reduce the number of wires in a vehicle. Technician B says that a communications network is used to share data from sensors, which can be used by many different modules. Which technician is correct?
Both technicians
Headlights can be aimed by using ________.
An aiming screen /A bubble level
Either A or B /Neither A nor B
Either A or B
When the oil pressure drops to between 3 and 7 psi, the oil pressure lamp lights by ________.
Opening the circuit / Shorting the circuit
Grounding the circuit / Conducting current to dash lamp by oil
Grounding the circuit
The forward bias voltage required for an LED is ________.
0.3 to .05 volt /0.5 to 0.7 volt
1.5 to 2.2 volts /4.5 to 5.1 volts
1.5 to 2.2 volts
Which computer function is defined as a voltage signal from a sensor or switch?
Input / Process
Storage / Output
Input
Which of these, commonly designated D2B, is an optical BUS system connecting audio, video, computer and telephone components in a single-ring structure with a speed of up to 5,600,000 bps?
Flexray BUS / CAN Network
GMLAN /Domestic Digital BUS
Domestic Digital BUS
A customer complained that every time he turned on his vehicle's lights, the left side turn signal indicator light on the dash remained on. The most likely cause is ________.
A poor ground to the parking light (or taillight) on the left side /A poor ground to the parking light (or taillight) on the right side, causing current to flow to the left side lights
A defective (open) parking light (or tail light) bulb on the left side /Either A or C
Either A or C
An important input to the backup camera system comes from the ________, which signals the backup camera when the transmission is shifted into reverse.
Transmission range switch /Backup lamps Dimmer switch /Rear view mirror
Transmission range switch
In automotive applications, an inverter is used to convert ________ .
DC voltage to a lower DC voltage / DC current to BC current
AC current to higher AC current /DC current to AC current
DC current to AC current
Which component contains the information in the computer that is specific to the particular model vehicle?
PROM, EPROM, or EEPROM / RAM
Transistor / Analog to digital converter
PROM, EPROM, or EEPROM
Which terminal of the data link connector does General Motors use for Class 2 communication? ]
1/2
3/4
2
Electrical feedback is usually a result of ________.
Too high a voltage in circuit /Too much current (amperage) in a circuit
Lack of a proper ground / Both A and B
Lack of a proper ground
Which of these is a type of electric motor designed to rotate in small steps based on the signal from a vehicle computer?
Stepper motor /Compound motor
Stepping motor / Shunt control motor
Stepper motor
The positive lead of a diode is called the ________.
Cathode /Anode
Emitter / None of these
Anode
Which computer function describes how the computer handles inputs?
Process / Input
Storage /Output
Process
UART uses a ________volt signal that toggles 0.
5/6
9/12
5
Technician A says that daytime running lights (DRLs) light the headlights, usually at reduced intensity, whenever the engine is running. Technician B says high-intensity discharge (HID) headlights are brighter and have a yellow tint. Which technician is correct?
Technician A
Technician A says that metal-type window tinting can affect the navigation system. Technician B says that most navigation systems require a monthly payment for use of the GPS satellite. Which technician is correct?
Technician A only
A transistor is similar to a ________ in operation.
Coil/Spark plug
Relay/Cable
Relay
The "brain" of the computer is the ________.
PROM / RAM
CPU / AD converter
CPU
Technician A says that a CANDi module will flash the RED LED rapidly if communication is detected. Technician B says that a twisted pair is where two wires are twisted to prevent electromagnetic radiation from affecting the signals passing through the wires. Which technician is correct?
Technician B only
Technician A says that automotive bulbs are identified by trade numbers. Technician B says that the trade number is the different for each manufacturer for the exact same bulb specification. Which technician is correct?
Technician A says that the data displayed on the dash can come from the engine computer. Technician B says that the entire instrument panel assembly may have to be replaced even if just one unit fails. Which technician is correct?
Both technicians