Digital Principles and System Design MCQs with answers Page - 13

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Q. How many AND, OR and EXOR gates are required for the configuration of full adder?

• (A) 1, 2, 2
• (B) 2, 1, 2
• (C) 3, 1, 2
• (D) 4, 0, 1

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Correct answer - Option (B)

Explanation:

there are 2 and, 1 or and 2 exor gates required for the configuration of full adder, provided using half adder. otherwise, configuration of full adder would require 3 and, 2 or and 2 exor.

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Q. How many types of digital comparators are?

• (A) 1
• (B) 2
• (C) 3
• (D) 4

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Correct answer - Option (B)

Explanation:

there are two main types of digital comparator available and these are: identity comparator & magnitude comparator. identity comparator checks only the equality of the inputs and thus has one output terminal. while magnitude comparator checks for greater than, less than as well as equality of the inputs, and thus has 3 output terminals.

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Q. An identify comparator is defined as a digital comparator which has

• (A) only one output terminal
• (B) two output terminals
• (C) three output terminals
• (D) no output terminal

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Correct answer - Option (A)

Explanation:

an identity comparator is a digital comparator that has only one output terminal for when a = b either “high” a = b = 1 or “low” a = b = 0.

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Q. A magnitude comparator is defined as a digital comparator which has

• (A) only one output terminal
• (B) two output terminals
• (C) three output terminals
• (D) no output terminal

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Correct answer - Option (C)

Explanation:

a magnitude comparator is a digital comparator which has three output terminals, one each for equality, a = b greater than, a > b and less than a

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Q. The purpose of a Digital Comparator is

• (A) to convert analog input into digital
• (B) to create different outputs
• (C) to add a set of different numbers
• (D) to compare a set of variables or unknown numbers

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Correct answer - Option (D)

Explanation:

a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. the purpose of a digital comparator is to compare a set of variables or unknown numbers, for example a (a1, a2, a3, …. an, etc) against that of a constant or unknown value such as b (b1, b2, b3, …. bn, etc) and produce an output condition or flag depending upon the result of the comparison.

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Q. TTL 74LS85 is a

• (A) 1-bit digital comparator
• (B) 4-bit magnitude comparator
• (C) 8-bit magnitude comparator
• (D) 8-bit word comparator

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Correct answer - Option (B)

Explanation:

ttl 74ls85 is a 4-bit magnitude comparator.

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

• (A) 4
• (B) 8
• (C) 10
• (D) 16

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Correct answer - Option (C)

Explanation:

an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the

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Q. How many outputs will a decimal-to-BCD encoder have?

• (A) 4
• (B) 8
• (C) 12
• (D) 16

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Correct answer - Option (A)

Explanation:

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 encoder has 4 outputs.

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Q. How is an encoder different from a decoder?

• (A) the output of an encoder is a binary code for 1-of-n input
• (B) the output of a decoder is a binary code for 1-of-n input
• (C) the output of an encoder is a binary code for n-of-1 output
• (D) the output of a decoder is a binary code for n-of-1 output

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Correct answer - Option (A)

Explanation:

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

• (A) multiplexing
• (B) encoding
• (C) decoding
• (D) demultiplexing

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Correct answer - Option (B)

Explanation:

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.

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