AL CS Digital Logic Circuits Quiz

What are the outputs of a half adder circuit?

• Sum and difference

• Sum and carry

• Carry and borrow

• Product and sum

Which gates are used in the simplest half adder circuit?

• XOR and AND

• OR and NOT

• NAND and NOR

• XOR and OR

Why can't a half adder be used to add multiple binary bits?

• It can only add denary numbers

• It cannot handle a carry input from the previous stage

• It only works with decimal numbers

• It cannot produce a sum bit

How is a full adder different from a half adder?

• A full adder cannot handle a carry input

• A full adder is only used for decimal addition

• A full adder can add three input bits, including a carry from the previous column

• A full adder can only add two input bits without carry

What is the purpose of using flip-flop circuits in computers?

• They are used to create combinational circuits

• They store and remember the output states from previous inputs

• They simplify the full adder circuit

• They perform addition of binary numbers

Which of the following is a problem with SR flip-flops?

• They do not store values

• They have no set or reset functionality

• They can enter invalid states with S = 1 and R = 1

• They cannot be used in memory devices

How does a JK flip-flop resolve the issue found in SR flip-flops?

• It uses a third input to ensure the outputs are synchronized

• It includes a clock and additional gates to prevent illegal states

• It removes the set and reset functionality

• It is only used for counting binary numbers

What happens when both J and K inputs in a JK flip-flop are set to 1?

• The flip-flop resets to 0

• The flip-flop sets to 1

• The flip-flop toggles between set and reset states

• The flip-flop outputs an invalid state

Which of the following Boolean expressions represents the OR gate?

• A · B

• A + B

• A ⊕ B

• A' + B'

What is the simplified Boolean expression for the logic circuit: ((A AND B) OR (B OR C)) AND (A OR NOT C)?

• A.B + B.C

• (A + B') + C

• ((A · B) + (B + C)) · (A + ¬C)

• A.B + A.C