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ECE :: Digital Electronics

  1. In a J-K flip flop the input J = K = 1 pulse is about

  2. A.
    set
    B.
    reset
    C.
    no change
    D.
    toggle

  3. In a four variable Karnaugh map, eight adjacent cells give a

  4. A.
    two variable term
    B.
    single variable term
    C.
    three variable term
    D.
    four variable term

  5. Binary 1000 multiplied by binary 1000 gives

  6. A.
    10000
    B.
    100000
    C.
    1000000
    D.
    10000000

  7. 111012 x 100012 =

  8. A.
    111101101
    B.
    111101100
    C.
    11110
    D.
    1100110

  9. Schmitt trigger can be used as a

  10. A.
    comparator
    B.
    square-wave generator
    C.
    flip-flop
    D.
    all of these

  11. Most of the digital computers do not have floating-point hardware because

  12. A.
    floating point hardware is costly
    B.
    it is slower than software
    C.
    it is not possible to perform floating point addition by hardware
    D.
    of not specific reason

  13. Consider the following statements in connection with CMOS inverter in figure where both the MOSFET are of enhancement type and both have a threshold voltage of 2 V
    statements 1: T1 conducts when vi ≥ 2 V
    statements 2: T1 is always in saturation when v0 = 0 V
    Which of the following is correct?

  14. A.
    Only statement 1 is true
    B.
    Only statement 2 is true
    C.
    Both the statement are true
    D.
    Both the statements are false

  15. The number of FF required for a divide by 12 circuit is

  16. A.
    16
    B.
    12
    C.
    8
    D.
    4

  17. In sign magnitude numbers,

  18. A.
    the leading bit stands for the sign
    B.
    the leading bit is part of the magnitude
    C.
    the leading bit is always 0
    D.
    the leading bit is always 1

  19. In order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instructions are needed?

  20. A.
    El only
    B.
    SIM only
    C.
    El and SIM only
    D.
    None