Ch. 71 Computer Fundamentals

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Refer to this diagram of a fuel pump control circuit. What type of a driver circuit is used in this​ circuit?

High-side driver circuit

Which of the following statements is true of the storage function of​ computers?

Nonvolatile​ random-access memory​ (RAM) memory is used for the storage of odometer information in an electronic speedometer.

Which of the following statements is true of modern automotive control​ systems?

Automotive computers convert input information or data into voltage signal combinations to send and receive information.

Which term describes the speed of data​ transmission?

Baud rate

Which data set contains only two​ digits?

Binary

Two technicians were discussing the parts of a computer. Technician A stated that the microprocessor is considered the brain of a computer. Technician B stated that some computers use more than one​ microprocessor, called a coprocessor. Which of the following statements about this scenario is​ true?

Both technician A & technician B

Which term describes the process of manually adjusting variables such as​ speed, load, and spark timing to determine the optimum output settings for the​ computer?

Engine mapping

​________ creates a​ three-dimensional performance graph that applies to a given vehicle and powertrain combination.

Engine mapping

Which item is a computer output​ device?

Evaporative emission control solenoid, Transmission shift solenoid, Fuel injector

A fuel injector can be an input or an output component.

False

Which of the following is a significant characteristic of a​ read-only memory​ (ROM)?

Read-only memory​ (ROM) retains data even when the power to the computer is shut off.

The​ "brain" of the computer is the​ ________.

CPU

The ratio of on time relative to the period of the complete cycle is the​ ________.

Duty cycle

Two technicians were discussing the ways to control the amount of vacuum flowing through a vacuum solenoid. Technician A stated that a pulse width modulation could be used. Technician B stated that a switched driver could be used. Which of the following statements about this scenario is​ true?

Only technician A

Which computer function describes how the computer handles​ inputs?

Process

Which of the following statements is true of​ pulse-width modulation​ (PWM)?

The ratio of​ on-time relative to the period of the cycle is referred to as duty cycle.

What unit of electricity is used as a signal for a​ computer?

Volt

The cycle time or clock speed is measured in​ ________.

megahertz

Analog signals from sensors are changed to digital signals for processing by the computer through which type of​ circuit?

Analog-to-digital converter

What two things can a vehicle computer actually perform​ (output)?

Turn something on or turn something off

Two technicians had different views on computer output devices. Technician A stated that the computer can vary the amount of time the injectors are held open. Technician B stated that the computer can control the flow of gasoline fumes from the charcoal canister to the engine. Which of the following statements about this scenario is​ true?

Both technicians A & B

Which computer component generates a steady stream of​ one-bit long voltage​ pulses?

Clock generator

Computer speed is measured in​ ________.

Clock speed​ (Hz)

All OBDII vehicles use what type of​ read-only memory?

EEPROM

Which component contains the information in the computer that is specific to the particular model​ vehicle?

EEPROM

Which of the following processes includes amplifying voltage signals that are too small for the computer circuitry to​ handle?

Input conditioning

The four basic computer functions include​ ________.

Input, processing,​ storage, and output

What does the baud rate in a computer​ represent?

It represents the speed of the computer.

Which sensor is used to measure manifold​ vacuum?

MAP

Two technicians were discussing the types of output drivers. Technician A stated that​ high-side drivers are transistors inside the computer that complete the ground path of relay coil. Technician B stated that​ low-side drivers control the power side of the circuit. Which of the following statements about this scenario is​ true?

Neither technicians A or B

Two technicians had different views on clock rates and timing. Technician A stated that the microprocessor communicates by transmitting long strings of 0s and 1s in a language called binary code. Technician B stated that a linear actuator is used to determine when one signal ends and another begins. Which of the following statements about this scenario is​ true?

Only technician A

The SAE term for the vehicle computer is​ ________.

PCM

Which item is a computer input​ sensor?

Throttle position angle, Engine coolant temperature, & RPM

​A(n) ________ is an electrical or mechanical device that converts electrical energy into​ heat, light, or motion to control engine idle​ speed, suspension​ height, ignition​ timing, and other output devices.

actuator

Which of the following components is used to determine when one signal ends and another​ begins?

clock generator

The throttle position sensor is an output component.

false

Which computer function is defined as a voltage signal from a sensor or​ switch?

input

Which of the following basic functions of computers involves receiving voltage signals from​ sensors?

input

Identify the computer input sensor that is used to detect engine load using a signal from a sensor that measures the vacuum in the intake manifold.

manifold absolute pressure sensor

The task of performing essential mathematical operations and logic decisions is carried out by the​ ________.

microprocessor

Which of the following basic functions of computers most likely describes how input voltage signals received by a computer are handled through a series of electronic logic circuits maintained in its programmed​ instructions?

processing

Which of the following computer input sensors is used for engine control and the shift points of the automotive​ transmission/transaxle?

throttle position sensor


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