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ECE :: Digital Electronics

  1. The number of distinct Boolean expression of 4 variables is

  2. A.
    16
    B.
    256
    C.
    1024
    D.
    65536

  3. The fixed count that should be used so that the output register will represent the input for a 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).

  4. A.
    000110
    B.
    0010
    C.
    1111
    D.
    011101

  5. For the K map in the given figure the simplified Boolean expression is

  6. A.
    A C + A D + ABC
    B.
    A C + A D + ABC
    C.
    A C + A D + ACD
    D.
    A C + A D + AB C

  7. A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is

  8. A.
    2
    B.
    4
    C.
    8
    D.
    18

  9. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is

  10. A.
    9
    B.
    7
    C.
    3
    D.
    1

  11. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is

  12. A.
    2 and 7
    B.
    3 and 7
    C.
    1 and 6
    D.
    3 and 6

  13. A three state switch has three outputs. These are

  14. A.
    low, low and high
    B.
    low, high, high
    C.
    low. floating, low
    D.
    low, high, floating

  15. Maxterm designation for A + B + C is

  16. A.
    M0
    B.
    M1
    C.
    M3
    D.
    M4

  17. 1's complement of 11100110 is

  18. A.
    00011001
    B.
    10000001
    C.
    00011010
    D.
    00000000