B CompE Bachelor of Computer Engineering Digital Logic Design 2

Question 1

What is the key difference between a latch and a flip-flop?

Accepted Answer

Latches are level-triggered; flip-flops are edge-triggered

Answer

Latches are level-sensitive (transparent when enabled) while flip-flops are edge-triggered, changing state only on the rising or falling edge of a clock signal.

Question 2

In a full adder, how many inputs does it have?

Accepted Answer

3

Answer

A full adder has three inputs: two significant bits (A and B) and a carry-in (Cin), producing a Sum and a Carry-out.

Question 3

What does a multiplexer (MUX) do?

Accepted Answer

Selects one of several input signals and forwards it to a single output

Answer

A multiplexer selects one of its 2^n data inputs based on n select lines and routes it to a single output, acting like a digitally controlled switch.

Question 4

Which type of counter counts in a sequence where only one bit changes between consecutive states?

Accepted Answer

Gray code counter

Answer

A Gray code counter changes only one bit per step, reducing switching noise and glitches compared to a standard binary counter.

Question 5

What is the fan-out of a logic gate?

Accepted Answer

The maximum number of gate inputs the output can reliably drive

Answer

Fan-out specifies how many logic gate inputs a single gate's output can drive while maintaining valid logic levels.

B CompE Bachelor of Computer Engineering Practice Test

B CompE Bachelor of Computer Engineering Practice Test

B CompE Bachelor of Computer Engineering Digital Logic Design 2