B CompE Bachelor of Computer Engineering Digital Logic and Circuit Design

Question 1

Which logic gate produces an output of 1 only when all inputs are 1?

Accepted Answer

AND gate

Answer

An AND gate outputs 1 (HIGH) only when all of its inputs are simultaneously 1; otherwise it outputs 0.

Question 2

What is the decimal equivalent of the binary number 1011?

Accepted Answer

11

Answer

Binary 1011 = 1x8 + 0x4 + 1x2 + 1x1 = 8 + 0 + 2 + 1 = 11 in decimal.

Question 3

Which of the following is a minimization technique for Boolean expressions?

Accepted Answer

Karnaugh Map (K-map)

Answer

A Karnaugh Map (K-map) is a visual method for simplifying Boolean expressions by grouping adjacent minterms.

Question 4

What type of logic circuit has its output depend only on the current inputs with no memory?

Accepted Answer

Combinational Circuit

Answer

A combinational circuit produces outputs determined solely by current inputs, with no feedback or memory elements.

Question 5

Which flip-flop sets output Q=1 on S=1,R=0, and resets Q=0 on S=0,R=1?

Accepted Answer

SR Flip-Flop

Answer

The SR (Set-Reset) flip-flop sets Q to 1 when S=1,R=0 and resets Q to 0 when S=0,R=1; the S=R=1 state is invalid.

B CompE Bachelor of Computer Engineering Practice Test