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ECE :: Digital Electronics

  1. What will be BCD number when the output is 0.37 V?

  2. A.
    00110111
    B.
    10110111
    C.
    11001000
    D.
    01001000

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  3. The first machine cycle of an instruction is always

  4. A.
    a memory read cycle
    B.
    a fetch cycle
    C.
    a input/output read cycle
    D.
    a memory write cycle

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  5. A counter has N flip flops. The total number of states are

  6. A.
    N
    B.
    2 N
    C.
    2N
    D.
    4 N

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  7. Out of S, R, J, K, Preset, Clear inputs to flip flops, the synchronous inputs are

  8. A.
    S, R, J, K only
    B.
    S, R, Preset, Clear only
    C.
    Preset, Clear only
    D.
    S, R only

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  9. The Boolean expression A ⊕ B is equivalent to

  10. A.
    AB + AB
    B.
    AB + AB
    C.
    B
    D.
    A

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  11. Which of these are two state devices?

  12. A.
    Lamp
    B.
    Punched card
    C.
    Magnetic tape
    D.
    All of the above

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  13. What will be minimum conversion rate in 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

  14. A.
    9000
    B.
    9259
    C.
    1000
    D.
    1000

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  15. For the K map of the given figure, the simplified Boolean expression is

  16. A.
    A C + A D + ABC
    B.
    A B D + BC
    C.
    A C D + AC
    D.
    A C D + AC + BC

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  17. The dual of A + [B + (AC)] + D is

  18. A.
    A + [(B (A + C))] + D
    B.
    A [B + AC] D
    C.
    A + [B (A + C)] D
    D.
    A [B (A + C)] D

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  19. A divide by 78 counter can be obtained by

  20. A.
    6 numbers of mod-13 counters
    B.
    13 numbers of mod-6 counters
    C.
    one mod-13 counter followed by mod-6 counter
    D.
    13 number of mod-13 counters

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