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Test: Encoders & Decoders - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test Digital Electronics - Test: Encoders & Decoders

Test: Encoders & Decoders for Electronics and Communication Engineering (ECE) 2024 is part of Digital Electronics preparation. The Test: Encoders & Decoders questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Encoders & Decoders MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Encoders & Decoders below.
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Test: Encoders & Decoders - Question 1

A _________ is a multiple-input, multiple-output logic circuit which converts coded inputs into coded outputs, where the input and output code are different.

Detailed Solution for Test: Encoders & Decoders - Question 1

Encoder:

An encoder has 2n input lines and n output lines. In the encoder, the output lines generate the binary code corresponding to the input value which is active high.

Decoder:

It is a multi-input and multi-output logic circuit that converts coded inputs into coded outputs where input and output codes are different. Input code has fewer bits than output code. There is one to one mapping from input to output.

Multiplexer:

It is a digital switch. It allows digital information from several sources to be routed onto a single output line. A basic multiplexer has several data input lines and a single output line. The selection of a particular input line is controlled by selection lines. It is many to one mapping and provides the digital equivalent of an analog selector switch. Therefore it is the correct answer

Demultiplexer:

It is a circuit that receives information on a single line and transmits information on one of the 2n output lines. Selection of output line is controlled by values of n selection lines. 

Test: Encoders & Decoders - Question 2

A decoder converts n inputs to __________ outputs.

Detailed Solution for Test: Encoders & Decoders - Question 2

Decoder is a circuit with n input lines and 2n output lines.

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Test: Encoders & Decoders - Question 3

Which of the following can be represented for decoder?

Detailed Solution for Test: Encoders & Decoders - Question 3

Combinational circuit in which output depends only on the state of inputs.

Test: Encoders & Decoders - Question 4

Which of the following is a decoder IC?

Detailed Solution for Test: Encoders & Decoders - Question 4

8870 is a DTMF decoder circuit, which decodes DTMF tune and produces corresponding output.

Test: Encoders & Decoders - Question 5

Invalid BCD can be made to valid BCD by adding with _______________

Detailed Solution for Test: Encoders & Decoders - Question 5

Invalid BCD are numbers greater than 1001, and they can be made valid BCD by adding with 0110.

Test: Encoders & Decoders - Question 6

Which of the following represents a number of output lines for a decoder with 4 input lines?

Detailed Solution for Test: Encoders & Decoders - Question 6

For n input lined decoder will have 2n output lines.

Test: Encoders & Decoders - Question 7

Which of the following are building blocks of encoders?

Detailed Solution for Test: Encoders & Decoders - Question 7

Encoders are made up of three OR gates.

Test: Encoders & Decoders - Question 8

BCD to seven segment conversion is a ________________

Detailed Solution for Test: Encoders & Decoders - Question 8

BCD to seven segment code conversion can be treated as a decoding process.

Test: Encoders & Decoders - Question 9

 DTMF stands for ________________

Detailed Solution for Test: Encoders & Decoders - Question 9

DTMF is the short form of Dual Tone Multiple Frequency.

Test: Encoders & Decoders - Question 10

Decoder is constructed from ________________

Detailed Solution for Test: Encoders & Decoders - Question 10

Decoder circuits are constructed from Inverters and AND gates.

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