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Basic Computer Control
1. The computer can read but not change the information stored in:
ROM. RAM. KRAM. non of the above.
2. Technician A says that a digital signal is either on or off. Technician B says that an analog signal changes proportionally to the quantity measured. Who is correct?
Technician A only. Technician B only. Both Technician A and B. Neither Technician A nor B.
3. RAM is short for:
random only memory. read only memory. random access memory. Reverse bias amp motor.
4. The binary system used by a digital computer consists of:
10 numbers. 5 numbers. 2 numbers. 1 number.
5. The frequency of an AC signal is determined by the:
peak value of the sine wave. number of cycles per unit of time. amplitude of the signal being generated. all of the above.
6. The simplest digital sensor is a:
relay. switch. a/c generator. solenoid.
7. One cycle per __________ equals one hertz:
second. minute. revolution. any of the above.
8. An analog signal
is either on or off. is either a 1 or a 0. is a varying voltage. any of the above.
9. Which of the following memory circuits is used to store trouble codes and other temporary information?
read only memory. programmed read only memory. random access memory. any of the above.
10. Computers rely on ____________ for their input signals:
solenoids. sensors. actuators. all of the above.
11. Digital Signals are:
used to control outputs. either full voltage (on) or zero voltage (off). square waveforms. All of the above.
12. The volatile RAM provides for:
specific vehicle operating programs. the removal of the ROM. a memory scratch pad for diagnostic capabilities. all of the above.
13. Technician A says that analog input data must be digitized by an A/D converter. Technician B says that output data must be changed to analog signals by a D/A converter. Who is correct?
Technician A. Technician B. Both technicians A and B. Neither technicians A or B.
14. Technician A says that the computer can read but not change the information stored in RAM. Technician B says that the computer can read and change the information stored in ROM. Who is correct?
15. A sensor that informs a body computer about temperature, such as an ambient air temperature sensor for A/C is a:
potentiometer. hall-effect switch. thermistor. thermodiode.
16. A sensor that provides information about position, such as a power seat sensor:
17. A sensor that provides information about speed, such as a wheel speed sensor:
galvanic battery. voltage divider circuit. variable resistor. Magnetic pulse generator.
18. Computer outputs control which of the following devices:
sensors, motors, and relays. motors, variable resistors, solenoids. motors, lamps, relay, and solenoids. relays, lamps, motors, and pulse generators.
19. The "air bag" light turns on and goes off 1 hour:
this is an intermittent fault. is fault is retained in memory. both a and b. neither a nor b.
20. Some computers sends a Pulse Width Modulation (Duty Cycle) signal to control the cooling fan. This signal is a:
varying an analog signal high and then low. D.C. signal that is varying the percent of 'ON' time. constant 12 volt . both a and c.
21. Closed loop operation in a fuel injection system is based on:
oxygen content of exhaust gases. volume of intake air. fuel pressure. none of the above.
22. The TPS (Throttle Position Sensor) input is used to do all of the following, except
indicate the rate of acceleration. indicate the rate of deceleration. alter the spark advance curve. determine idle speed RPM.
23. During wide-open-throttle, the PCM (Engine Computer) reverts to:
closed loop, rich mixture. closed loop, lean mixture. open loop with a fixed lean mixture. open loop, rich mixture.
24. Which of the following sensors is used to measure engine temperature?
Coolant sensor. Manifold absolute pressure sensor. Throttle position sensor. Air Temperature sensor.
25. A bad coolant temperature sensor will
always set a code. always prevent the car from starting. can cause driveability and gas mileage problems. all of the above.
