These are the most asked digital electronics MCQ questions 2022 for beginners & professionals

## These Are The Most Asked Digital Electronics MCQ Questions

**1. According to Boolean Algebra, the resultant of the operation (A + AB) will be?**

**A. A**

**B. A + B**

**C. AB**

**D. B**

Ans: A

**2. A single input gate in which input and output are the same is called?**

**A. Buffer**

**B. EX-NOR**

**C. AND**

**D. Inverter**

Ans: Buffer

**3. A 2-input gate gives high output only when both the inputs are low. For all other conditions, the output remains low. Identify the gate?**

**A. NOR**

**B. NAND**

**C. OR**

**D. EX-OR**

Ans: NOR

**4. Find the correct option for simplification of the Boolean expression (P+Q+R)(S+T)’ + (P+Q+R)(S+T)?**

**A. P’ Q’ R’**

**B. S+T**

**C. P+Q+R**

**D. S’+T’**

Ans: P+Q+R

**5. How many cells would be required in the Karnaugh map if 4 variables are involved in preparing the map for function minimization?**

**A. 4**

**B. 8**

**C. 12**

**D. 16**

Ans: 16

**6. Which of the following logic families consume max power?**

**A. DCTL**

**B. CMOS**

**C. TTL**

**D. ECL**

Ans: ECL

**7. Which of the following IC logic families has a max value of fan-out?**

**A. Low power Schottky TTL**

**B. ECL**

**C. Standard TTL**

**D. CMOS**

Ans: CMOS

8**. If the inputs are P, Q, and R, then in the full adder, find the output expression of the sun>**

**A. P OR Q OR R**

**B. P XOR Q XOR R**

**C. P OR Q AND R**

**D. P AND Q AND R**

Ans: P XOR Q XOR R

**9. Whi pair is known as universal logic gates?**

**A. NAND or OR**

**B. NAND or NOR**

**C. NAND or EXOR**

**D. AND or NOR**

Ans: NAND or NOR

**10. _________ converts binary-coded information to unique outputs such as decimal, octal digits, etc.**

**A. Decoder**

**B. Demultiplexing**

**C. Multiplexing**

**D. Encoder**

Ans: Decoder

**11. A ______________ arithmetic circuit adds two binary digits, giving a sum bit and a carry bit**

**A. full-adder**

**B. half-subtractor**

**C. half-adder**

**D. full subtractor**

Ans: Half-adder

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**12. _____________ in Boolean algebra is similar to addition in ordinary algebra**

**A. NAND operation**

**B. NOT operation**

**C. AND operation**

**D. OR operation**

Ans: OR operation

**13. There are ____________ number of digits in a binary number system.**

**A. 8**

**B. 2**

**C. 4**

**D. 6**

Ans: 2

**14. Which of the following is a universal gate for logic circuits?**

**A. NOT**

**B. OR**

**C. AND**

**D. NAND**

Ans: NAND

**15. Which is t most commonly used display in the digital electronics field?**

**A. Incandescent display**

**B. Micro-phoretic image display**

**C. Liquid vapor display**

**D. Gas discharge plasma display**

Ans: Micro-phoretic image display

**16. Which of the following is the fastest of all saturated logic families? It is also used in SSI and MSI ICs.**

**A. RTL**

**B. | L**

**C. TTL**

**D. DCTL**

Ans: TTL

1**7. Which of the following binary code is also called gray code?**

**A. Reflected code**

**B. Excess-3 code**

**C. BCD code**

**D. Biquinary code**

Ans: Reflected binary code

**18. The one major disadvantage of CMOS is ___________**

**A. high noise margin**

**B. low fan-out**

**C. high power dissipation**

**D. slow operating speed**

Ans: slow operating speed

**19. The T flip-flop is a single-input version of the ______ flip-flop**

**A. D**

**B. clocked RS**

**C. JK**

**D. RS**

Ans: JK

**20. The base of the octal number system is ________**

**A. 8**

**B. 16**

**C. 10**

**D. 2**

Ans: 8

**21. The basic circuit for the ECL family is the __________ gate**

**A. AND**

**B. OR/NOR**

**C. NAND**

**D. XNOR**

Ans: XNOR

**22. Which of the following IC logic families has a minimum value of fan-out?**

**A. Loe power Schottky TTL**

**B. ECL**

**C. Standard TTL**

**D. CMOS**

Ans: Standard TTL

**23. Using Boolean algebra, if the following Boolean expression is minimized, then the result will be: AB + ABC + AB (D + E)**

**A. AB**

**B. A**

**C. ABC**

**D. ABCD**

Ans: AB

**24. How many squares will be there in a three-variable Karnaugh map?**

**A. 16**

**B. 8**

**C. 2**

**D. 4**

Ans: 8