# Basic Digital Principles - Gibilisco MCQs in Electronics

MCQs in Basic Digital Principles from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

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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