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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

  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

  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

  7. The problem of logic race occurs in

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

  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

  11. Symbol in the given figure is IEEE symbol for

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

  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

  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

  17. Which of them contains an organic fluid?

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

  19. A buffer is

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