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4. Which of the following best describes a digital voltage? A. It…

4. Which of the following best describes a digital voltage?

A. It is continuously variable within a given range and requires time to change. B. It varies, but not continuously, and requires no time to change. C. It is often referred to as a square wave. D. Both B and C.

5. How many combinations of 0’s and 1’s are available to an 8-bit computer?

A. 64 B. 128 C. 256 D. 65,536

6. How many combinations of 0’s and 1’s are available to a 16-bit computer?

A. 64 B. 128 C. 256 D. 65,536

7. The binary code 01101110 equals what decimal (base 10) numerical value?

A. 5 B. 110 C. 124 D. 421

8. The binary code 1100001111100101 equals which of the following hexadecimal values?

A. C3D8 B. C3E5 C. D3F5 D. B3E5

9. Which of the following components in an engine computer is a nonvolatile memory that contains information specific to a particular vehicle or model?

A. A/D converter B. ROM C. RAM D. PROM

10. Which of the following components in an engine computer translates analog input signals to binary code?

A. A/D converter B. ROM C. RAM D. PROM

11. Which of the following components in an engine computer is a volatile memory used by the microprocessor to store temporary information?

A. A/D converter B. ROM C. RAM D. PROM

12. Concerning an AND gate, which of the following would cause the output (C) to be a binary 1?

A. When input A is a binary 0 and input B is a binary 1 B. When input A is a binary 1 and input B is a binary 0 C. When both inputs, A and B, are a binary 1 D. All of the above

13. Concerning an OR gate, which of the following would cause the output (C) to be a binary 1?

A. When input A is a binary 0 and input B is a binary 1 B. When input A is a binary 1 and input B is a binary 0 C. When both inputs, A and B, are a binary 1 D. All of the above

14. Which of the following could cause the reference voltage regulator and the logic gates within a computer to function improperly or not at all?

A. Low battery voltage B. Battery does not hold a proper load when the starter motor is engaged C. Excessive resistance within the computer’s power and/or ground circuits D. All of the above

15. Technician A says that any time a computer begins making incorrect decisions and starts controlling a system improperly, it should automatically be replaced. Technician B says that if a computer begins making incorrect decisions and starts controlling a system 61 improperly, replacing the computer may not be the appropriate repair. Who is correct?

A. Technician A only B. Technician B only C. Both technicians D. Neither technician

16. What air-fuel ratio is required to allow a three-way catalytic converter to work effectively?

A. 12:1 B. 13.7:1 C. 14.7:1 D. 17:1

17. Why does the PCM try to maintain a stoichiometric air-fuel ratio?

A. To minimize the potential for producing toxic emissions (CO, HC, and ) in the combustion chamber B. To maximize the production of and in the combustion chamber C. To help the three-way catalytic converter work most effectively D. All of the above

18. Technician A says that closed-loop operation is designed to allow the engine computer to monitor the results of its own fuel control NOx H2O CO2 through an oxygen sensor or air-fuel ratio sensor mounted in the exhaust stream. Technician B says that closed loop is the best engineoperating mode for WOT performance because of the increased precision that closed loop provides. Who is correct?

A. Technician A only B. Technician B only C. Both technicians D. Neither technician

19. Closed-loop operation requires all of the following except:

A. The oxygen sensor must reach operating temperature. B. The engine coolant temperature must be at or above a criterion temperature. C. The vehicle speed must be at least 20 MPH. D. A predetermined amount of time must have elapsed since the engine was started.

20. Technician A says that the continued changes in automotive design are a challenge to every technician. Technician B says that if you pursue learning through the reading of textbooks and through taking technical classes, new technology can become your advantage. Who is correct?

A. Technician A only B. Technician B only C. Both technicians D. Neither technician

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