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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

  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

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

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

  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

  9. The Boolean expression A ⊕ B is equivalent to

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

  11. Which of these are two state devices?

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

  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

  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

  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

  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