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Test: Comparators - 2 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Comparators - 2

Test: Comparators - 2 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Comparators - 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Comparators - 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Comparators - 2 below.
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Test: Comparators - 2 - Question 1

In order to design 5 bit comparator, how many output(s) is/are needed?

Detailed Solution for Test: Comparators - 2 - Question 1

Comparator


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.
For N ≤ 2k bit comparator circuit, k output lines are required.

Calculation
Given, N = 5
5 ≤ 2k
k = 3

Test: Comparators - 2 - Question 2

For the 2-bit comparator circuit having inputs as A1A0 and B1B0, the Boolean expression for A = B output can be expressed as:

Detailed Solution for Test: Comparators - 2 - Question 2

2-bit comparator
A comparator used to compare two binary numbers each of two bits is called a 2-bit magnitude comparator.
It consists of four inputs and three outputs to generate less than, equal to, and greater than between two binary numbers.

The truth table for the 2-bit comparator is given below:

The output of the A=B is:

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Test: Comparators - 2 - Question 3

A digital circuit which compares two numbers A3 A2 A1 A0, B3 B2 B1 B0 is shown in figure. To get output Y = 1, the correct pair of input numbers are

Detailed Solution for Test: Comparators - 2 - Question 3


Given that output is 1.

To get the output y = 1, all the inputs of OR gate should not be zero.

From the options, A3 A2 A1 A0 = 0010, B3 B2 B1 B0 = 1011 satisfies this condition.

Test: Comparators - 2 - Question 4

Maximum conversion time in clock cycles for three types of 8 bit ADCs (i) Successive approximation, (ii) Dual slope and (iii) Parallel comparator are respectively

Detailed Solution for Test: Comparators - 2 - Question 4

Concept:

The conversion time of different types of n-bit ADC is shown:

  • From the above table, it is clear that the dual-slope is the slowest ADC and Flash Type is the fastest ADC.
  • The conversion type of Flash type is independent of the number of bits 

Application:

n = 8

  • Maximum conversion time in clock cycles of 8-bit Successive approximation type ADC  = n=  8
  • Maximum conversion time in clock cycles of 8 bit Dual slope type ADC = 2n+1 = 29 = 512
  • Maximum conversion time in clock cycles of 8 bit Successive approximation type ADC = 1
Test: Comparators - 2 - Question 5

X = X1X0 and Y = Y1Y0 are 2-bit binary numbers. The Boolean function S that satisfies the condition “If X > Y, then S = 1”, in its minimized form, is 

Detailed Solution for Test: Comparators - 2 - Question 5

x = x1 x0 y = y1 y0
The Boolean function S that satisfies condition,
If x > y, then s = 1.
We can represent the above condition through a truth table.

By using k-maps

Minimized form:

Test: Comparators - 2 - Question 6

The circuit shown in the figure is a –

Detailed Solution for Test: Comparators - 2 - Question 6

From the given circuit we can find the outputs expression as follows:

So, the given circuit in question behaves like a comparator circuit. 

Test: Comparators - 2 - Question 7

Which of the following is a 4 bit Comparator IC?

Detailed Solution for Test: Comparators - 2 - Question 7

  • 74LS85 is a 4-bit magnitude comparator of two binary format inputs.
  • 74LS85 can compare two 4-bit binary data and output can be given in a 3-bit parallel form.
  • The IC has low power consumption and gives output in the TTL form which makes it compatible with other TTL devices and microcontrollers.

The block diagram is as shown:

Test: Comparators - 2 - Question 8

The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is

Detailed Solution for Test: Comparators - 2 - Question 8

The only possible combinations are
A = 01 and B = 0 0
A = 10 and B = 00, 01
A = 11 and B = 00, 01, 10
So there are only 6 combinations
Tips and Tricks:

where n = 2 bit

Test: Comparators - 2 - Question 9

How to obtain high rate of accuracy in comparator?

Detailed Solution for Test: Comparators - 2 - Question 9

 High voltage gain causes comparator output voltage to switch between saturation levels. High CMRR rejects noise at input terminal and input offset (voltage & current) help to keep changes in temperature variation very slight.

Test: Comparators - 2 - Question 10

Which of the following is true for uses of comparators?

Detailed Solution for Test: Comparators - 2 - Question 10

Comparators are used in mass production where components are checked at a fast rate. These can be used as inspection purposes, laboratory standards and working standards or gauges.

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