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ECE :: Digital Electronics

  1. A 4 bit counter with four flip-flops will count upto decimal

  2. A.
    8
    B.
    15
    C.
    31
    D.
    63

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  3. Out of the following memory types, one that is volatile is

  4. A.
    ferrite-core
    B.
    semiconductor RAM
    C.
    semiconductor ROM
    D.
    magnetic disc

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  5. A number given in binary as 0101.01 is to be scaled up 4 times. The scaled up binary is

  6. A.
    10101
    B.
    01.0101
    C.
    0404.04
    D.
    010.101

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  7. The problem of logic race occurs in

  8. A.
    SOP functions
    B.
    POS functions
    C.
    Hybrid function
    D.
    SOP and POS functions

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  9. A shift register can be used for all of the following EXCEPT

  10. A.
    ring counter
    B.
    A/D conversion
    C.
    series to parallel conversion
    D.
    generation of delay

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  11. Symbol in the given figure is IEEE symbol for

  12. A.
    AND
    B.
    OR
    C.
    NAND
    D.
    NOR

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  13. For a level input sequential circuit

  14. A.
    output in a level only
    B.
    output is in the pulse form
    C.
    output may be a pulse or a level form
    D.
    none of these

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  15. In a digital system, the maximum clock frequency that can be used with Master/Slave Clocked flip-flops having total propagation delay of 200 μsec is

  16. A.
    20 MHz
    B.
    50 MHz
    C.
    100 MHz
    D.
    200 MHz

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  17. Which of them contains an organic fluid?

  18. A.
    LED
    B.
    LCD
    C.
    Both LED and LCD
    D.
    Neither LED nor LCD

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  19. A buffer is

  20. A.
    always non-inverting
    B.
    always inverting
    C.
    inverting or non-inverting
    D.
    none of the above

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