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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

  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

  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

  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

  9. Binary 1111 when subtracted from binary 11111 is

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

  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

  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

  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

  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

  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