## Multiple Choice Questions with Answers on Digital Electronics Circuits - Boolean Expression Simplification

1. A/ + B/ + C/ = D represents a

a. NOR gate

b. AND gate

c. NAND gate

d. EX-OR gate

Ans: c

2. Output of which of the following gates is 1 only if at least one of its inputs is 0?

a. NOR gate

b. AND gate

c. NAND gate

d. EX-OR gate

Ans: c

3. Which gate has the output low only when both inputs are high?

a. NOR gate

b. AND gate

c. NAND gate

d. EX-OR gate

Ans: c

4. Which of the following Boolean algebra rules is correct?

a. A. A/ = 1

b. A + A.B = A+B

c. A + A/.B = A+B

d. A(A + B) = B

Ans: c

5. Which of the following statements is true?

a. (A + B) (A + C) = AC + BC

b. (A + B) (A + C) = AB + C

c. (A + B) (A + C) = A + BC

d. (A + B) (A + C) = AC + B

Ans: c

6. Which of the following is a universal gate?

a. OR gate

b. AND gate

c. NOR gate

d. EX-OR gate

Ans: c

7. Which of the following statements is not true?

a. A + A/  B = A

b. A (A/  + B) = AB

c. AB+ AB/ = A

d. CA + CA/  B = CA + CB

Ans: a

8. Which of the following is not functionally a complete set?

a. AND, OR

b. NAND

c. AND, OR, NOT

d. NOR

Ans: a

9. The NAND gate can function as a NOT gate if

a. inputs are connected together

b. inputs are left open

c. one input is set to 0

d. one input is set to 1

Ans: a

10. What is the minimum number of two input NAND gates used to perform the function of two input OR gate?

a. one

b. two

c. three

d. four

Ans: c

Hope this post on "MCQ on Digital Electronics with Answers - 3" will help Electronics Engineering and Electrical Engineering students in preparation of technical interviews, GATE, IES etc.