CSE 1st Year: NOR Gate Truth Table
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Questions and Answers

What is the output of a two-input NOR gate when both inputs are 1?

  • undefined
  • 1
  • 0 (correct)
  • 1 and 0 alternating
  • Which equation correctly describes the operation of a NAND gate with inputs A and B?

  • A NAND B = A AND B
  • A NAND B = A + B
  • A NAND B = NOT(A AND B) (correct)
  • A NAND B = A OR B
  • What is the output of a two-input NAND gate when both inputs are 0?

  • 0
  • 1 (correct)
  • undefined
  • alternates between 0 and 1
  • What is the primary characteristic of a NOR gate?

    <p>It only produces a logic 1 output when all inputs are 0.</p> Signup and view all the answers

    Which of the following statements about NAND gates is true?

    <p>NAND gates require all inputs to be high to output a low signal.</p> Signup and view all the answers

    In the truth table of a NOR gate, what is the output for inputs A=0 and B=1?

    <p>0</p> Signup and view all the answers

    When combining logic gates, what role does a NAND gate serve?

    <p>It can be used to construct any other type of logic gate.</p> Signup and view all the answers

    How can the output of a two-input NAND gate be expressed mathematically?

    <p>$C = NOT(A AND B)$</p> Signup and view all the answers

    What is the output when both inputs of an XNOR gate are 1?

    <p>1</p> Signup and view all the answers

    Which operation does an XNOR gate implement?

    <p>Exclusive NOR operation</p> Signup and view all the answers

    What is the Boolean expression of the output Y for an XNOR gate with inputs A and B?

    <p>Y = NOT(A XOR B)</p> Signup and view all the answers

    In the truth table of an XOR gate, what is the output when both inputs are 0?

    <p>0</p> Signup and view all the answers

    How many inputs does an XNOR gate take?

    <p>Two inputs</p> Signup and view all the answers

    What will be the output of an XNOR gate if the inputs are 0 and 1?

    <p>0</p> Signup and view all the answers

    Which of the following statements is true about the operation of an XNOR gate?

    <p>It is a combination of XOR and NOT gates</p> Signup and view all the answers

    What output does an XNOR gate produce when both inputs are equal to 1?

    <p>1</p> Signup and view all the answers

    What is the output of an XNOR gate when both inputs are 0?

    <p>1</p> Signup and view all the answers

    In Boolean algebra, how is a minterm defined?

    <p>The product of N distinct literals</p> Signup and view all the answers

    When does the Boolean function F(A,B,C,D) = A + BC' + D return a high output?

    <p>When A=1, or BC'=1, or D=1</p> Signup and view all the answers

    How many rows would a truth table have for a Boolean function with 4 input variables?

    <p>16</p> Signup and view all the answers

    Which of the following devices do not typically utilize logic gates in their circuits?

    <p>Traditional clocks</p> Signup and view all the answers

    What is the sum of N distinct literals known as in Boolean algebra?

    <p>Maxterm</p> Signup and view all the answers

    What will the XNOR output be when inputs A = 1 and B = 0?

    <p>0</p> Signup and view all the answers

    What is the value of the Boolean function F=xy'z+p when x=1, y=0, z=1, and p=0?

    <p>1</p> Signup and view all the answers

    What is the final expression for the K-map of the 3 variables F(A,B,C)=∏M(0,3,6,7)?

    <p>(A'+B')(B'+C')(A+B+C)</p> Signup and view all the answers

    Which grouping results from the green group in the K-map of F(A,B,C,D)=∏M(3,5,7,8,10,11,12,13)?

    <p>C'DB</p> Signup and view all the answers

    What is the significance of 'Don’t Care' conditions in K-maps?

    <p>They allow flexibility in grouping cells.</p> Signup and view all the answers

    Which of the following represents a 'Don’t Care' condition in K-maps?

    <p>X</p> Signup and view all the answers

    What is the correct resultant product expression of F(A,B,C,D) from the red group?

    <p>(C’+D’+A)</p> Signup and view all the answers

    For the K-map with 4 variables, how many product terms are derived from the combination of cell groups?

    <p>4</p> Signup and view all the answers

    Which grouping is NOT utilized in the simplification of F(A,B,C,D)=∏M(3,5,7,8,10,11,12,13)?

    <p>A'B'C'</p> Signup and view all the answers

    What is the term that results from taking the complement of the yellow group's findings in the K-map of 3 variables?

    <p>ABC</p> Signup and view all the answers

    What is the result of minimizing the SOP function f = Σm(1, 5, 6, 11, 12, 13, 14) + d(4) using K-Maps?

    <p>BC' + BD' + A'C'D + AB'CD</p> Signup and view all the answers

    How should don’t care conditions be treated when converting a POS expression to SOP form?

    <p>They are kept as they are.</p> Signup and view all the answers

    In the POS function F(A, B, C, D) = Σm(0, 1, 2, 3, 4, 5) + d(10, 11, 12, 13, 14, 15), what is the minimal POS form?

    <p>(A' + C)(B' + C')</p> Signup and view all the answers

    What is the significance of ‘don’t care’ conditions in digital circuit design?

    <p>They help reduce power consumption.</p> Signup and view all the answers

    Which of the following statements about don’t cares is false?

    <p>They should always be considered as valid inputs.</p> Signup and view all the answers

    When minimizing functions using K-Maps, how do don’t cares affect the grouping of terms?

    <p>They can be included to make larger groups.</p> Signup and view all the answers

    In the example function F(A, B, C, D) with don’t cares d(12, 13, 14, 15), which minterms are missing from the POS expression?

    <p>6, 7, 8, 9</p> Signup and view all the answers

    What is the first step in converting a standard SOP function with don’t cares to a POS expression?

    <p>Identify the missing minterms.</p> Signup and view all the answers

    Study Notes

    Truth Table of NOR Gate

    • A two-input NOR gate produces an output of 1 only when both inputs are 0.
    • Relationships:
      • A=0, B=0 → A NOR B = 1
      • A=0, B=1 → A NOR B = 0
      • A=1, B=0 → A NOR B = 0
      • A=1, B=1 → A NOR B = 0

    NAND Gate Overview

    • Commonly used universal logic gate performing inverted AND operations.
    • Configuration:
      • NAND Gate = AND Gate + NOT Gate
    • Outputs low (logic 0) only when all inputs are high (logic 1).

    Truth Table of XOR Gate

    • An exclusive OR (XOR) gate outputs 1 when inputs differ.
    • Relationships:
      • A=0, B=0 → A XOR B = 0
      • A=0, B=1 → A XOR B = 1
      • A=1, B=0 → A XOR B = 1
      • A=1, B=1 → A XOR B = 0

    XNOR Gate Properties

    • XNOR gate outputs high (logic 1) when both inputs are similar.
    • Defined as:
      • XNOR Gate = XOR Gate + NOT Gate
    • Serves as a similarity detector in circuits.

    Truth Table of XNOR Gate

    • Relationships:
      • A=0, B=0 → A XNOR B = 1
      • A=0, B=1 → A XNOR B = 0
      • A=1, B=0 → A XNOR B = 0
      • A=1, B=1 → A XNOR B = 1

    Applications of Logic Gates

    • Essential components in digital circuits.
    • Utilized in:
      • Computers
      • Microprocessors
      • Microcontrollers
      • Digital/Smart watches
      • Smartphones

    Boolean Functions

    • Define logical operations through binary variables.
    • Represented by Boolean Expressions.
    • Example: F = xy'z + p outputs 1 when conditions are met.

    Methods of Simplification: K-map

    • Minterms and Maxterms:
      • Minterm: Product of distinct literals (outputs 1).
      • Maxterm: Sum of distinct literals (outputs 0).

    K-map for Three Variables

    • For F(A, B, C) = ∏M(0, 3, 6, 7), significant terms derived through grouping.

    K-map for Four Variables

    • For F(A, B, C, D) = ∏M(3, 5, 7, 8, 10, 11, 12, 13), grouping leads to minimal expression.

    Don’t Care Conditions in K-Maps

    • "Don’t Care" conditions allow flexibility in grouping, leading to simplification of Boolean expressions.
    • They can be treated as 1, 0, or ignored, enhancing group sizes.

    Significance of "Don’t Care" Conditions

    • Simplifies output expression, accounting for invalid inputs.
    • Reduces the number of gates needed in circuit design, making it more economical.
    • Lowers power consumption by minimizing switching states and memory space.

    Examples of Minimizing Functions with K-Maps

    • Applying SOP and POS forms illustrates simplifications effectively.
    • Utilize don’t care conditions for optimal circuit design and expression reduction.

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    Description

    Test your knowledge on the truth table of the NOR gate with this quiz. It covers the relationships between inputs and output for a two-input NOR gate. This is ideal for students in their first year of Computer Science Engineering.

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