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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. Assertion (A): A demultiplexer can be used as a decoder.

    Reason (R): A demultiplexer can be built by using AND gates only.

    2. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  2. Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables.

    Reason (R): A XOR gate is a universal gate.

    3. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  3. The number of bits in ASCII is

    4. A.
    12
    B.
    10
    C.
    9
    D.
    7

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  4. In a D latch

    5. A.
    data bit D is fed to S input and D to R input
    B.
    data bit D is fed to R input and D to S input
    C.
    data bit D is fed to both R and S inputs
    D.
    data bit D is not fed to any input

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  5. A 4 : 1 multiplexer requires __________ data select line.

    6. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  6. The number of unused states in a 4 bit Johnson counter is

    7. A.
    2
    B.
    4
    C.
    8
    D.
    12

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  7. It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are

    8. A.
    a, b, c
    B.
    b, c, d
    C.
    c, d, e
    D.
    a, b, d

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  8. For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is

    9. A.
    3.774 MHz
    B.
    > 3.774 MHz
    C.
    < 3.774 MHz
    D.
    4.167 MHz

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  9. 1001012 is equal to decimal number

    10. A.
    47
    B.
    37
    C.
    21
    D.
    17

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  10. A Karnaugh map with 4 variables has

    11. A.
    2 cells
    B.
    4 cells
    C.
    8 cells
    D.
    16 cells

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