Digital Logic Design MCQs

What does the J in a JK flip-flop stand for?

• Jump

• Jack

• Junction

• Set

Which flip-flop eliminates the race-around condition?

• RS Flip-Flop

• JK Flip-Flop

• T Flip-Flop

• D Flip-Flop

In a D flip-flop, the output Q is equal to the:

• Complement of input D

• Input D

• Clock pulse

• Previous state of Q

The input to a T flip-flop toggles the output when it is:

• High

• Low

• Alternating

• Changing

Which gate combination is used in a NAND latch?

• Two AND gates

• Two OR gates

• Two NAND gates

• Two NOR gates

A half adder adds:

• Two bits and generates a carry

• Two bits without carry

• Three bits with carry

• Four bits

What is the sum output equation for a half adder?

• A AND B

• A OR B

• A XOR B

• A XNOR B

A full adder can add how many bits?

• 1

• 2

• 3

• 4

The carry output equation for a full adder is:

• AB + BC + CA

• A XOR B

• A AND B

• A + B + C

Which gates are used in the design of a full adder?

• XOR, AND, OR

• AND, NOR, NOT

• NAND, XOR

• NOR, XOR