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ECE :: Digital Electronics

  1. A buffer is a device that isolates other devices. Typically a buffer has

  2. A.
    a high input impedance and a low output impedance
    B.
    a high input impedance as well as output impedance
    C.
    a low input impedance and a high output impedance
    D.
    a low input impedance as well as output impedance

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  3. Which of the following is used as switch?

  4. A.
    J-K flip-flop
    B.
    Master slave J-K flip-flop
    C.
    T-flip-flop
    D.
    D-flip-flop

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  5. In a positive edge triggered D flip flop

  6. A.
    D input is called direct set
    B.
    Preset is called direct reset
    C.
    Present and clear are called direct set and reset respectively
    D.
    D input overrides other inputs

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  7. The first contribution to logic was made by

  8. A.
    George Boole
    B.
    Copernicus
    C.
    Aristotle
    D.
    Shannon

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  9. Average latency time of magnetic tape memory is of the order of

  10. A.
    1 μ sec
    B.
    1 msec
    C.
    1 sec
    D.
    1 minute

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  11. Which one of the following is loaded in the main memory by the bootstrap loader?

  12. A.
    System data
    B.
    User program
    C.
    BIOS
    D.
    Part of DOS

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  13. In a NAND SR latch S = 0, R = 1 then

  14. A.
    Q = 0
    B.
    Q = 1, Q = 0
    C.
    it is race condition
    D.
    none of the above

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  15. Microprocessors find applications in

  16. A.
    pocket calculators
    B.
    scientific instruments
    C.
    medical equipments
    D.
    all of the above

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  17. The characteristic equation of flip-flop gives the next state QN + 1 in terms of present state QN and the inputs. Which one of the following is the characteristic equation of J - K flip-flop?

  18. A.
    QN+1 = JQN + KQN
    B.
    QN+1 = J + KQN
    C.
    QN+1 = KQN + JQN
    D.
    QN+1 = K + JQN

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  19. If we need a device to shut off a few ampere current in a few nano seconds, the proper devices is

  20. A.
    VMOS
    B.
    CMOS
    C.
    BJT
    D.
    UJT

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