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ECE :: Digital Electronics

Digital Electronics - Section 1
Digital Electronics - Section 2
Digital Electronics - Section 3
Digital Electronics - Section 4
Digital Electronics - Section 5
Digital Electronics - Section 6
Digital Electronics - Section 7
Digital Electronics - Section 8
Digital Electronics - Section 9
Digital Electronics - Section 10
Digital Electronics - Section 11
Digital Electronics - Section 12
Digital Electronics - Section 13
Digital Electronics - Section 14
Digital Electronics - Section 15
Digital Electronics - Section 16
Digital Electronics - Section 17
Digital Electronics - Section 18
Digital Electronics - Section 19
Digital Electronics - Section 20
Digital Electronics - Section 21
Digital Electronics - Section 22
Digital Electronics - Section 23
Digital Electronics - Section 24
Digital Electronics - section-25
Digital Electronics - Section-26

  1. In 8085 microprocessor, what is the memory word size?

    2. A.
    6 bits
    B.
    8 bits
    C.
    12 bits
    D.
    16 bits

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  2. Which of the following memory is preferred in case of calculators?

    3. A.
    Dynamic RAM
    B.
    Dynamic ROM
    C.
    Static ROM
    D.
    Static RAM

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  3. Which device changes parallel data to serial data?

    4. A.
    Decoder
    B.
    Multiplexer
    C.
    Demultiplexer
    D.
    Flip flop

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  4. A 12 bit ADC is employed to convert an analog voltage of zero to 10 volts. The resolution of the ADC is

    5. A.
    2.44 mV
    B.
    24.4 mV
    C.
    83.3 mV
    D.
    1.2 V

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  5. Race condition always arises in

    6. A.
    synchronous circuit
    B.
    asynchronous circuit
    C.
    combinational circuit
    D.
    digital circuit

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  6. The expression Y (A, B, C) = ∑m (1, 3, 5, 6) is to realized using a multiplexer. Then

    7. A.
    use 8 : 1 multiplexer and ground input lines 1, 3, 5, 6
    B.
    use 8 : 1 multiplexer and ground input lines 0, 2, 4, 7
    C.
    use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3
    D.
    use 8 : 1 multiplexer and ground input lines 4, 5, 6, 7

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  7. A microprocessor with a 16 bit address bus is used in a linear memory selection configuration. Address bus lines are directly uses as chip selects of memory chips with 4 memory chips the maximum addressable memory space is

    8. A.
    64 k
    B.
    16 k
    C.
    8 k
    D.
    4 k

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  8. An I/O processor control the flow of information between

    9. A.
    cache memory and I/O devices
    B.
    main memory and I/O devices
    C.
    1 Two I/O devices
    D.
    cache and main memories

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  9. The process of entering data into ROM is called

    10. A.
    writing
    B.
    burning
    C.
    decoding
    D.
    registering

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  10. Which of the following conversion is incorrect?

    11. A.
    2048.0625 = 100000000000.00012
    B.
    100000011.10012 = 131.562510
    C.
    1011012 = 458
    D.
    Hexadecimal B6C7 = 4679110

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