Test: Encoders - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test GATE Electrical Engineering (EE) Mock Test Series 2025 - Test: Encoders

Test: Encoders for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) Mock Test Series 2025 preparation. The Test: Encoders questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Encoders MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Encoders below.
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Test: Encoders - Question 1

How many inputs will a decimal-to-BCD encoder have?

Detailed Solution for Test: Encoders - Question 1

An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. Thus, a Decimal-to-bcd converter has decimal values as inputs which range from 0-9. So, a total of 10 inputs are there in a decimal-to-BCD encoder.

Test: Encoders - Question 2

How is an encoder different from a decoder?

Detailed Solution for Test: Encoders - Question 2

An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. It performs the opposite operation of a decoder which results in 2n outputs from n inputs. Thus, an encoder different from a decoder because of the output of an encoder is a binary code for 1-of-N input.

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Test: Encoders - Question 3

Can an encoder be a transducer?

Detailed Solution for Test: Encoders - Question 3

Of course, a transducer is a device that has the capability to emit data as well as to accept. Transducer converts signal from one form of energy to another.

Test: Encoders - Question 4

How many OR gates are required for an octal-to-binary encoder?

Detailed Solution for Test: Encoders - Question 4

An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. Thus, in octal to binary encoder there are 8 (= 23) inputs, thus 3 output lines.

Test: Encoders - Question 5

The discrepancy of 0 output due to all inputs being 0 or D0, being 0 is resolved by using additional input known as ___________

Detailed Solution for Test: Encoders - Question 5

Such problems are resolved by using enable input, which behaves as active if it gets 0 as input since it is an active-low pin.

Test: Encoders - Question 6

If we record any music in any recorder, such types of process is called ___________

Detailed Solution for Test: Encoders - Question 6

If we record any music in any recorder, it means that we are giving data to a recorder. So, such process is called encoding. Getting back the music from the recorded data is known as decoding.

Test: Encoders - Question 7

How many OR gates are required for a Decimal-to-bcd encoder?

Detailed Solution for Test: Encoders - Question 7

An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input.
This is clear from the diagram that it requires 4 OR gates:

Test: Encoders - Question 8

A single bit comparator compares two numbers A and B and produces three outputs Y1 (if A = B), Y2 (if A > B) and Y3(if A < B) as given below:

Choose the correct answer from the options given below:

Detailed Solution for Test: Encoders - Question 8

Concept:

A magnitude digital Comparator is a combinational circuit that compares two digital or binary numbers in order to find out whether one binary number is equal, less than or greater than the other binary number. We logically design a circuit for which we will have two inputs one for A and another for B and have three output terminals, one for A > B condition, one for A = B condition, and one for A < B condition.

Application:

1-Bit Magnitude Comparator:

A comparator used to compare two bits is called a single bit comparator. It consists of 2-inputs each for two single-bit numbers (0 or 1) and 3-outputs to generate less than, equal to and greater than between two binary numbers.

The truth table for a 1-bit comparator is given below:

Test: Encoders - Question 9

For an encoder, if the number of output lines is m, then the number of input lines will be _______ .

Detailed Solution for Test: Encoders - Question 9
  • The encoders are used for coding binary data. The encoder is a combinational logic circuit that converts an active input signal into a coded output signal.
  • It has n input lines, only one of which is active at any time and m output lines. It encodes one of the active inputs to a coded binary output with m bits. In an encoder, the number of output lines is less than the number of inputs. If an encoder has n input lines and m output lines than n<= 2m.

Example:

For 8 × 3 Encoder

n = 8

m = 3

8 = 23

n = 2m

For 7 × 3 Encoder

n = 7

m = 3

7 < 23

Test: Encoders - Question 10

If half adders and full adders are implements using gates, then for the addition of two 17 bit numbers (using minimum gates) the number of half adders and full adders required will be

Detailed Solution for Test: Encoders - Question 10

Take 2 numbers for 17 bits, for the first 2 bits of each number we need one-half adder and for rest(16 bit of each number) we will have one carry of previous sum and two bits of each number so we need one full adder for each rest of bits, that is, 16 full adder.

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