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ECE :: Digital Electronics

  1. In a flip-flop with a NAND latch, a low R and a low S produces

  2. A.
    active condition
    B.
    inactive condition
    C.
    race condition
    D.
    dead condition

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  3. ECL can be used to high frequencies in the order of

  4. A.
    500 kHz
    B.
    1 MHz
    C.
    100 MHz
    D.
    500 MHz

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  5. The output Y of the circuit shown in the figure is

  6. A.
    (A + B) C + DE
    B.
    AB + C(D + E)
    C.
    (A + B) C + D + E
    D.
    (AB + C) . DE

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  7. Status register in the 8156 is read with

  8. A.
    IN 20 H
    B.
    OUT 20 H
    C.
    either (a) or (b)
    D.
    none of the above

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  9. Binary 1111 when subtracted from binary 11111 is

  10. A.
    101110
    B.
    10110
    C.
    10000
    D.
    100010

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  11. Computer virus is a piece of rough software of unknown origin that

  12. A.
    copies itself like a breeding germ
    B.
    spreads from one machine to another
    C.
    eats away processing power
    D.
    all of the above

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  13. What is the result for expression (map method)?
    ABC + AD + D (B + C) + AC + A D

  14. A.
    A + D + BC
    B.
    A + D
    C.
    A D + B C
    D.
    A + D + BC

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  15. In a 4 bit full adder how many half adders and OR gates are required

  16. A.
    8 and 4
    B.
    7 and 4
    C.
    7 and 3
    D.
    8 and 3

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  17. Which of the following is not a specification of D/A and A/D converters?

  18. A.
    Gain
    B.
    Drift
    C.
    Speed
    D.
    Accuracy

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  19. Words having 8 bits are to be stored into computer memory. The number of lines required for writing into memory are

  20. A.
    1
    B.
    2
    C.
    4
    D.
    8

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