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Test: De-Multiplexers - GATE MCQ


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10 Questions MCQ Test - Test: De-Multiplexers

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Test: De-Multiplexers - Question 1

_________ is the device having 1 input and N outputs.

Detailed Solution for Test: De-Multiplexers - Question 1

Demultiplexer (DEMUX) is used in digital signal processing, for enhancing the input signal. The input and output ratio in a DEMUX is given by;

1 : 2n, where n = 1, 2, 3, and so on.

Ex: 1 : 1, 1 : 2, 1 : 4, 1 : 8, etc.

Therefore, for one data input they have several (N) outputs.

Test: De-Multiplexers - Question 2

The logic diagram shown in the figure represents

Detailed Solution for Test: De-Multiplexers - Question 2

The given logic circuit represents 2 to 4 decoder and 1 to 4 line demultiplexer.

For the decoder, the inputs are A1 and A0, and the enable is input E.

For demultiplexer, input E provides the data, while other inputs accept the selected variables.

This can be verified from the table given below:

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Test: De-Multiplexers - Question 3

Name the following figure.

Detailed Solution for Test: De-Multiplexers - Question 3

Multiplexer: Multiplexer is a device that has multiple inputs and single line output.

De-multiplexer: De-multiplexer is a device that has a signal inputs line and multiple line outputs.

The given figure has one input and two outputs. Hence it is De-multiplexer.

Combinational circuit:

  • Combinational and sequential circuits are the digital circuits made using logic gates
  • Present output depends on the present input only
  • No feedback is present
  • No memory is present

Encoder: Encoder is used to converter other codes to binary

Test: De-Multiplexers - Question 4

A Demultiplexer has ________.

Detailed Solution for Test: De-Multiplexers - Question 4

Demultiplexer (DEMUX) is used in digital signal processing, for enhancing the input signal. The input and output ratio in a DEMUX is given by;

1 : 2n, where n = 1, 2, 3, and so on.

Ex: 1 : 1, 1 : 2, 1 : 4, 1 : 8, etc.

Therefore, for one data input they have several outputs.

Test: De-Multiplexers - Question 5

The word demultiplex means ___________

Detailed Solution for Test: De-Multiplexers - Question 5

The word demultiplex means “one into many” and distributor. A demultiplexer sends a single input to multiple outputs, depending on the select lines. It is clear from the diagram:

Test: De-Multiplexers - Question 6

Most demultiplexers facilitate which type of conversion?

Detailed Solution for Test: De-Multiplexers - Question 6

A demultiplexer sends a single input to multiple outputs, depending on the select lines. Demultiplexer converts single input into multiple outputs.

Test: De-Multiplexers - Question 7

In a multiplexer the output depends on its ___________

Detailed Solution for Test: De-Multiplexers - Question 7

A demultiplexer sends a single input to multiple outputs, depending on the select lines. As the select input changes, the output of the multiplexer varies according to that input.

Test: De-Multiplexers - Question 8

Which IC is used for the implementation of 1-to-16 DEMUX?

Detailed Solution for Test: De-Multiplexers - Question 8

IC 74154 is used for the implementation of 1-to-16 DEMUX, whose output is inverted input.

Test: De-Multiplexers - Question 9

How many select lines are required for a 1-to-8 demultiplexer?

Detailed Solution for Test: De-Multiplexers - Question 9

The formula for total no. of outputs is given by 2n, where n is the no. of select lines. In this case n = 3 since 23 = 8.

Test: De-Multiplexers - Question 10

Why is a demultiplexer called a data distributor?

Detailed Solution for Test: De-Multiplexers - Question 10

A demultiplexer sends a single input to multiple outputs, depending on the select lines. For one input, the demultiplexer gives several outputs. That is why it is called a data distributor.

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