Same chapter3 marksDifficulty: Medium
Draw the truth table of a full adder and state how many half adders it takes to build one.
Combinational and Sequential Logic Circuits
3 marksDifficulty: Medium
Distinguish between an encoder, a decoder and a multiplexer.
Original Khojo Papers practice question — not from a past board paper.
Answer
An encoder has 2n input lines and n output lines and produces the binary code of the active input. A decoder does the reverse, taking n inputs and activating one of 2n outputs. A multiplexer selects one of several input lines and passes it to a single output under the control of select lines.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A demultiplexer is the reverse of a multiplexer.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is a multiplexer, and how many select lines does an 8-to-1 multiplexer need?
Combinational and Sequential Logic Circuits
Same chapter3 marksDifficulty: Medium
Draw the truth table of a half adder and state its limitation.
Combinational and Sequential Logic Circuits
Same chapter3 marksDifficulty: Medium
What is a flip-flop and how does it differ from a combinational circuit?
Combinational and Sequential Logic Circuits
Same chapter3 marksDifficulty: Medium
Distinguish between an SR flip-flop and a JK flip-flop.
Combinational and Sequential Logic Circuits
Same subject3 marksDifficulty: Medium
State and verify the absorption law X + X·Y = X using a truth table.
Boolean Algebra