BCA-104: Logical Organization of Computer
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Questions and Answers

What does a parity bit do in error detection?

  • It stores additional information about the data.
  • It checks whether the number of 1s is even or odd. (correct)
  • It corrects errors in data transmission.
  • It adds an extra digit to increase the data size.

    • In the context of combinational circuits, which of the following best describes a characteristic feature?

  • It has memory elements for storing states.
  • It can function independently of inputs.
  • The output is determined by the previous input states.
  • The output depends solely on the current inputs. (correct)

    • Which of the following correctly describes a Full Adder?

  • It requires two inputs and produces two outputs.
  • It adds two bits along with a carry-in to produce a sum and a carry-out. (correct)
  • It is a type of multiplexer used for addition.
  • It can only add two single-bit numbers.

    • What distinguishes an encoder from a decoder?

    <p>An encoder converts signals from one format to another, while a decoder does the reverse. (D)</p> Signup and view all the answers

    What is a multiplexer used for in digital circuits?

    <p>To select and forward one signal from multiple inputs. (B)</p> Signup and view all the answers

    Flashcards

    Truth Table

    A truth table is a visual representation of a Boolean function. It lists all possible combinations of input values and their corresponding output values.

    Parity Bits

    Parity bits are extra bits added to a data word to detect errors during transmission. They ensure the total number of 1's in a data word (including the parity bit) is even or odd, depending on the parity scheme.

    BCD Code

    BCD (Binary Coded Decimal) is a binary code that represents each decimal digit (0-9) with a 4-bit binary code. This code is used in systems that require interaction with decimal-based data, like calculators.

    Combinational Circuit

    A combinational circuit is a digital circuit whose output depends only on the current input values. It performs operations without any memory or feedback.

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    Multiplexer

    A multiplexer (MUX) is a digital circuit that selects one of multiple input lines and directs it to a single output line. It works based on a control input that determines which input line is selected.

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    Study Notes

    BCA Examination 2022 - Logical Organization of Computer

    • Exam: First Semester, BCA-104
    • Time: 3 hours
    • Marks: 80
    • Instructions: Attempt 5 questions, equal marks for each
    • Note: Candidates must ensure correct and complete question paper is supplied, complaints will not be entertained after the examination.

    Unit I

    • Question 1(a): Describe Truth Table.
    • Question 1(b): Explain Multilevel NAND circuit.
    • Question 1(c): Write a short note on Parallel Binary Adder.
    • Question 1(d): What is Digital Signal?
    • Question 1(e): Explain Karnaugh Maps.
    • Question 1(f): Describe Standard SOP form of Boolean function.
    • Question 1(g): What is Unicode? Describe it.
    • Question 1(h): Describe Full Adder.

    Unit II

    • Question 2(a): What are parity bits? How are they relevant in error detection and correction code? Explain with example.
    • Question 2(b): Explain Floating point representation of number and character codes.
    • Question 3(a): Explain the BCD code in detail. Also, explain why these codes are used.
    • Question 3(b): Explain error detection and correction codes.

    Unit III

    • Question 4(a): Simplify the Boolean expression F(a, b, c) = Σ(1, 4, 5, 6, 7) using K-Map and realize the same using NAND gates.
    • Question 4(b): Explain canonical and standard form of Boolean function.
    • Question 5(a): Explain SOPs and POSs.
    • Question 5(b): Describe Venn Diagram and Boolean Algebra.

    Unit IV

    • Question 6(a): Explain AND-OR-INVERT and OR-AND-INVERT implementation.
    • Question 6(b): What is combinational circuit? Describe its characteristics and procedure for design.

    Unit V

    • Question 7(a): Design a combinational circuit that receives 2-bit binary input and produces its square at the output.
    • Question 7(b): What is a Universal Gate? Why are these named so? Justify.
    • Question 8(a): What is a multiplexer? How does it work? What are its applications? Explain.
    • Question 8(b): What is Half Adder and Full Adder? Design a full adder and implement the same using gates.
    • Question 9(a): Explain the principle of encoder and decoder; how are they different?
    • Question 9(b): What are comparators? Where are they used? Describe the types.

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    Description

    This quiz covers essential topics from the first semester BCA-104 course on Logical Organization of Computer. Students will explore concepts such as truth tables, NAND circuits, and Boolean functions. Prepare to tackle questions on digital signals and error detection methods.

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