FREE BEE Bachelor of Electrical Engineering Digital Logic Design Questions and Answers

Question 1

Which of the following Boolean expressions represents the output of a 2-input XOR gate?

Accepted Answer

A'B + AB'

Answer

AB

Answer

A + B

Answer

(A+B)(A'B')

Question 2

A combinational logic circuit has three inputs (A, B, C) and one output (F). The output F is HIGH only when an odd number of inputs are HIGH. Which type of standard logic gate or combination of gates would achieve this functionality?

Accepted Answer

A 3-input XOR gate

Answer

A 3-input AND gate

Answer

A 3-input OR gate

Answer

A 3-input NOR gate

Question 3

Simplify the following Boolean expression using Boolean algebra: F = A'B'C + A'BC + AB'C + ABC

Accepted Answer

F = C

Answer

F = A + C

Answer

F = B + C

Answer

F = A'B' + AB

Question 4

Which of the following describes the primary function of a multiplexer (MUX) in digital logic?

Accepted Answer

To select one of several input signals and route it to a single output.

Answer

To convert binary code to decimal code.

Answer

To distribute a single input signal to multiple outputs.

Answer

To store a single bit of data temporarily.

Question 5

A D-flip-flop is clocked with a positive edge-triggered clock signal. If the D input is held HIGH, what will be the state of the Q output immediately after the positive edge of the clock pulse?

Accepted Answer

Q will go HIGH.

Answer

Q will go LOW.

Answer

Q will toggle its previous state.

Answer

Q will remain unchanged regardless of the D input.

Question 6

Consider a 4-bit ripple counter constructed using J-K flip-flops. If the initial state is 0000, how many clock pulses are required for the counter to reach the state 1010?

Accepted Answer

10 clock pulses

Answer

8 clock pulses

Answer

6 clock pulses

Answer

12 clock pulses