Explore topic-wise MCQs in Digital Electronics.

This section includes 65 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.

51.

The expressions, , are equivalent.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
52.

For a three-input AND gate, with the input waveforms as shown below, which output waveform is correct?

A. a
B. b
C. c
D. d
Answer» D. d
Discussion
53.

Which step in this reduction process is using DeMorgan's theorem?

A. STEP 1
B. STEP 2
C. STEP 3
D. STEP 4
Answer» B. STEP 2
Discussion
54.

For a 3-input NAND gate, with the input waveforms as shown below, which output waveform is correct?

A. a
B. b
C. c
D. d
Answer» D. d
Discussion
55.

Which of the examples below expresses the distributive law?

A. (A + B) + C = A + (B + C)
B. A(B + C) = AB + AC
C. A + (B + C) = AB + AC
D. A(BC) = (AB) + C
Answer» C. A + (B + C) = AB + AC
Discussion
56.

A small circle on the output of a logic gate is used to represent the:

A. Comparator operation.
B. OR operation.
C. NOT operation.
D. AND operation.
Answer» D. AND operation.
Discussion
57.

The logic gate that will have HIGH or "1" at its output when any one of its inputs is HIGH is a(n):

A. NOR gate
B. OR gate
C. AND gate
D. NOT operation
Answer» C. AND gate
Discussion
58.

What is the basic difference between AHDL and VHDL?

A. ADHL is used in all PLD's.
B. VHDL is used in all PLD's.
C. ADHL is proprietary.
D. VHDL is proprietary.
Answer» D. VHDL is proprietary.
Discussion
59.

For a three-input OR gate, with the input waveforms as shown below, which output waveform is correct?

A. a
B. b
C. c
D. d
Answer» C. c
Discussion
60.

Which timing diagram shown below is correct for an inverter?

A. a
B. b
C. c
D. d
Answer» C. c
Discussion
61.

Which of the figures given below represents a NOR gate?

A. a
B. b
C. c
D. d
Answer» E.
Discussion
62.

Which of the examples below expresses the associative law of addition:

A. A + (B + C) = (A + B) + C
B. A + (B + C) = A + (BC)
C. A(BC) = (AB) + C
D. ABC = A + B + C
Answer» B. A + (B + C) = A + (BC)
Discussion
63.

A LOW placed on the input of an inverter will produce a HIGH output.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
64.

Which of the figures (a to d) is the DeMorgan equivalent of Figure (e)?

A. a
B. b
C. c
D. d
Answer» B. b
Discussion
65.

The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

A. truth table.
B. input logic function.
C. Boolean constant.
D. Boolean variable.
Answer» B. input logic function.
Discussion