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Important Digital Logic and Design Short Questions

Chapter: 18
Question 1:
How can a multiplexer be used in a 2-digit 7-segment display circuit?
Answer: A multiplexer in a 2-digit 7-segment display circuit switches between two BCD inputs, allowing both digits to be displayed by rapidly toggling between them.
Chapter: 18
Question 2:
How can multiplexers be used in operation sequencing?
Answer: In operation sequencing, multiplexers control the sequence of industrial processes, ensuring that each step is completed before the next one starts.
Chapter: 18
Question 3:
What is a logic function generator?
Answer: A logic function generator uses a multiplexer to directly implement logic functions based on a function table, without the need for simplification.
Chapter: 19
Question 4:
What is the primary function of a Demultiplexer?
Answer: A Demultiplexer routes data from a single input to one of several outputs. It acts as a Data Distributor, performing the opposite function of a Multiplexer.
Chapter: 19
Question 5:
How is a Demultiplexer different from a Multiplexer?
Answer: A Multiplexer selects one input and routes it to a single output, whereas a Demultiplexer selects one of several outputs and routes data from a single input to the selected output.
Chapter: 19
Question 6:
What is another name for a Demultiplexer?
Answer: A Demultiplexer is also known as a Data Distributor.
Chapter: 19
Question 7:
What is a common use of a Demultiplexer in digital circuits?
Answer: Demultiplexers are used at the output of ALU circuits to route data to multiple registers or storage units.
Chapter: 19
Question 8:
How does a Demultiplexer reconstruct parallel data?
Answer: A Demultiplexer can convert serial data into parallel data by routing incoming serial bits to successive outputs using a counter attached to the select inputs.
Chapter: 19
Question 9:
What is the difference between a 1-to-4 Demultiplexer and a 2-to-4 Decoder?
Answer: The difference lies in the data input line. In a 1-to-4 Demultiplexer, the data input line is used as the enable line in the 2-to-4 Decoder circuit.
Chapter: 19
Question 10:
What are Programmable Logic Devices (PLDs)?
Answer: PLDs are digital devices that consist of programmable arrays of AND and OR gates, used to replace logic gates and MSI chips, saving circuit space and reducing cost.