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

Question 1

A digital circuit's output is dependent only on the present combination of its inputs. Which category does this circuit belong to?

Accepted Answer

Combinational logic circuit

Answer

Sequential logic circuit

Answer

Asynchronous circuit

Answer

Finite state machine

Question 2

An engineer is using a Karnaugh map (K-map) to simplify a 4-variable Boolean expression. What is the maximum number of adjacent '1's that can be grouped together to form a valid simplification term?

Accepted Answer

16

Answer

6

Answer

10

Answer

12

Question 3

In an asynchronous sequential circuit, a critical race condition occurs when:

Accepted Answer

The order in which multiple state variables change determines a different final stable state.

Answer

Two or more state variables change simultaneously but the final state is the same regardless of the order.

Answer

A single state variable changes value too slowly due to propagation delay.

Answer

The circuit enters a cycle of unstable states before reaching a final stable state.

Question 4

Which of the following digital components is also known as a 'data selector' because it uses control inputs to route one of several data inputs to a single output?

Accepted Answer

Multiplexer

Answer

Decoder

Answer

Demultiplexer

Answer

Encoder

Question 5

A designer needs to create a circuit that sequences through a specific series of states, but the transitions between states should only occur on the rising edge of a clock signal. Which of the following is the most fundamental building block for this type of circuit?

Accepted Answer

A flip-flop

Answer

An AND gate

Answer

A comparator

Answer

A multiplexer

Question 6

When representing a finite state machine (FSM), which tool provides a more visual and intuitive representation of states and the transitions between them?

Accepted Answer

State Diagram

Answer

Truth Table

Answer

Boolean Expression

Answer

State Table