Digital Logic And Logic Families-a2

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| By Pratiksha Patil
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Pratiksha Patil
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Questions: 9 | Attempts: 136

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Digital Logic And Logic Families-a2 - Quiz

Digital logic and logic families: Digital signals, combinational and sequential logic circuits, clock signals, Boolean algebra and logic gates. Integrated circuits and logic families: Logic Levels, Noise Immunity, Fan Out, Propagation Delay, TTL logic family CMOS Logic family, comparison with TTL family Flip flops: Set Reset(SR),Trigger(T), clocked F/Fs; Registers, decoders and encoders, Multiplexer and Demultiplexer, applications
04


Questions and Answers
  • 1. 

    1. Propagation delay

  • 2. 

    According to boolean law: A + 1 = ?

    • A.

      1

    • B.

      A

    • C.

      0

    • D.

      A'

    Correct Answer
    A. 1
    Explanation
    According to boolean law, when a variable A is ORed with 1, the result will always be 1. This is because in boolean algebra, 1 represents a true value and any variable ORed with true will always result in true. Therefore, the correct answer is 1.

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  • 3. 

    VLSI refers to digital ICs having

    • A.

      More than 1000 gates

    • B.

      More than 100 gates

    • C.

      More than 1000 but less than 9999

    • D.

      More than 100 but less than 999

    Correct Answer
    C. More than 1000 but less than 9999
    Explanation
    VLSI refers to Very Large Scale Integration, which means integrating a large number of components or gates onto a single chip. The correct answer states that VLSI refers to digital ICs having more than 1000 but less than 9999 gates. This range indicates that VLSI chips are capable of integrating a significant number of gates, making them suitable for complex digital circuits and applications.

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  • 4. 

    Whose operations are more faster among the following?

    • A.

      Combinational circuits

    • B.

      Sequential circuits

    • C.

      Latches

    • D.

      Flip-flops

    Correct Answer
    A. Combinational circuits
    Explanation
    Combinational circuits are faster than sequential circuits, latches, and flip-flops because they do not have any memory elements or feedback loops. Combinational circuits perform operations based solely on the current input values, without considering any previous states or inputs. This lack of memory allows them to have faster propagation delays and shorter gate delays compared to sequential circuits, latches, and flip-flops, which need to store and process information over time. Therefore, in terms of speed, combinational circuits are the fastest among the given options.

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  • 5. 

    Which is the major functioning responsibility of the multiplexing combinational circuit?

    • A.

      Decoding the binary information

    • B.

      Generation of all minterms in an output function with OR-gate

    • C.

      Generation of selected path between multiple sources and a single destination

    • D.

      All of the Mentioned

    Correct Answer
    C. Generation of selected path between multiple sources and a single destination
    Explanation
    The major functioning responsibility of a multiplexing combinational circuit is the generation of a selected path between multiple sources and a single destination. This means that the circuit is designed to route or switch data from multiple input sources to a single output destination based on a selection signal. This allows for efficient transmission of data and enables the sharing of resources among multiple sources.

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  • 6. 

    How many select lines are required for a 1-to-8 demultiplexer? a) 2 b) 3 c) 4 d) 5

    • A.

      2

    • B.

      3

    • C.

      4

    • D.

      5

    Correct Answer
    B. 3
    Explanation
    A 1-to-8 demultiplexer takes one input and distributes it to one of the eight outputs based on the select lines. In this case, the correct answer is 3 because three select lines are required to represent 8 possible output combinations. With three select lines, we can have 2^3 = 8 different combinations, allowing us to select any one of the eight outputs.

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  • 7. 

    The NOR gate output will be high if the two inputs are

    • A.

      00

    • B.

      10

    • C.

      10

    • D.

      11

    Correct Answer
    A. 00
    Explanation
    The NOR gate is a logic gate that produces an output of 1 (high) only when both of its inputs are 0 (low). In the given options, the only option where both inputs are 0 is "00". Therefore, the output of the NOR gate will be high for this input combination.

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  • 8. 

    A single transistor can be used to build which of the following digital logic gates?

    • A.

      AND gates

    • B.

      OR gates

    • C.

      NOT gates

    • D.

      NAND gates

    Correct Answer
    C. NOT gates
    Explanation
    A single transistor can be used to build a NOT gate. In a NOT gate, the output is the inverse of the input. By connecting the input to the base of the transistor and the output to the collector, when the input is low, the transistor is turned on and the output is high. Conversely, when the input is high, the transistor is turned off and the output is low. This behavior of the transistor allows it to function as a NOT gate.

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  • 9. 

    Digital data refers to information that is

    • A.

      Continuous

    • B.

      Discrete

    • C.

      Bits

    • D.

      Bytes

    Correct Answer
    B. Discrete
    Explanation
    Digital data refers to information that is discrete. This means that it is represented by distinct and separate values, rather than being continuous or analog. Discrete data is typically represented in binary format using bits and bytes, where each bit can have a value of 0 or 1. This allows for precise and accurate representation of information, making it suitable for digital storage, transmission, and processing.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 06, 2019
    Quiz Created by
    Pratiksha Patil
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