# Basic Digital Principles – Gibilisco MCQs in Electronics

(Last Updated On: December 8, 2017) This is the Multiple Choice Questions (MCQs) in Chapter 30: Basic Digital Principles from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

### Start Practice Exam Test Questions

1. The value of the decimal number 23 in binary form is:

• A. 1011.
• B. 110111.
• C. 10111.
• D. 11100.

2. The binary number 110001 represents the digital number:

• A. 49.
• B. 25.
• C. 21.
• D. 13.

3. The fifth digit from the right in a binary number carries a decimal value of:

• A. 64.
• B. 32.
• C. 24.
• D. 16.

4. The largest possible decimal number that can be represented by six binary digits (bits) is:

• A. 256.
• B. 128.
• C. 64.
• D. 63.

5. Which of the following voltages could normally represent a 1 in positive logic?

• A. 0 V.
• B. + 1 V.
• C. + 4 V.
• D. + 12 V.

6. Which of the following voltages might normally represent a 1 in negative logic?

• A. 0 V.
• B. + 4 V.
• C. + 6 V.
• D. + 12 V.

7. If X is low, what is the state of X AND Y?

• A. There is not enough information to tell.
• B. Low.
• C. High.
• D. This logic statement makes no sense.

8. If X is high, what is the state of X NOR Y?

• A. There is not enough information to tell.
• B. Low.
• C. High.
• D. This logic statement makes no sense.

9. If X and Y are both high, what is the state of X NAND Y?

• A. There is not enough information to tell.
• B. Low.
• C. High.
• D. This logic statement makes no sense.

10. If X is high and Y is low, what is the state of X NOT Y?

• A. There is not enough information to tell.
• B. Low.
• C. High.
• D. This logic statement makes no sense.

11. A logic circuit has four inputs W, X, Y, and Z. How many possible input combinations are there?

• A. 4.
• B. 8.
• C. 16.
• D. 32.

12. Data sent along a single line, one bit after another, is called:

• A. Serial.
• B. Synchronous.
• C. Parallel.
• D. Asynchronous.

13. If X = 1 and Y = 1, then X + YZ is:

• A. Always 0.
• B. 0 if Z = 0, and 1 if Z = 1.
• C. 1 if Z = 0, and 0 if Z = 1.
• D. Always 1.

14. If X = 0 and Y = 1, then X(Y + Z) is:

• A. Always 0.
• B. 0 if Z = 0, and 1 if Z = 1.
• C. 1 if Z = 0, and 0 if Z = 1.
• D. Always 1.

15. An advantage of a J-K over an R-S flip-flop is that:

• A. The J-K flip-flop is faster.
• B. The J-K can attain more states.
• C. The J-K always has predictable outputs.
• D. No! An R-S flip-flop is superior to a J-K.

16. In positive-edge triggering, the change of state occurs when:

• A. The pulse level is high.
• B. The pulse level is going from high to low.
• C. The pulse level is going from low to high.
• D. The pulse level is low.

17. The inputs of an R-S flip-flop are known as:

• A. Low and high.
• B. Asynchronous.
• C. Synchronous.
• D. Set and reset.

18. When both inputs of an R-S flip-flop are 0:

• A. The outputs stay as they are.
• B. Q = 0 and -Q = 1.
• C. Q = 1 and -Q = 0.
• D. The resulting outputs can be absurd.

19. When both inputs of an R-S flip-flop are 1:

• A. The outputs stay as they are.
• B. Q = 0 and -Q = 1.
• C. Q = 1 and -Q = 0.
• D. The resulting outputs can be absurd.

20. A frequency synthesizer makes use of

• A. An OR gate.
• B. A divider.
• C. The octal numbering system.
• D. The hexadecimal numbering system.

### Complete List of Multiple Choice Questions from this Book

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