Combinational Circuits Quiz

What is a combinational circuit?

• A circuit with memory

• A circuit whose output depends on the previous input

• A circuit whose output depends only on the present combination of inputs

• A circuit with no outputs

Which of the following statements is true about combinational circuits?

• They use memory elements

• Their output depends on both current and previous inputs

• They can have multiple inputs and outputs

• They operate based on a clock signal

What does a half adder do?

• Adds two multi-bit binary numbers

• Adds two single-bit binary numbers

• Adds three binary numbers

• Subtracts two binary numbers

Which of the following components does a full adder have that a half adder does not?

• XOR gate

• AND gate

• Carry-in input

• OR gate

A multiplexer (MUX) is used to:

• Route one input to several outputs

• Select one of many inputs to be routed to the output

• Store multiple values in memory

• Convert analog signals to digital signals

In a 4-to-1 multiplexer, how many select lines are needed?

• 1

• 2

• 3

• 4

A demultiplexer (DEMUX) is used to:

• Route one input to several outputs

• Select one of many inputs to be routed to the output

• Combine multiple inputs into one output

• Store values in memory

A 1-to-4 demultiplexer has how many outputs?

• 1

• 2

• 3

• 4

A decoder:

• Converts binary data into another digital format

• Encodes data into binary format

• Selects one output from many

• Is a type of memory circuit

Which of the following is an example of an encoder?

• Priority encoder

• Binary to decimal converter

• BCD to seven-segment decoder

• All of the above