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ECE :: Digital Electronics

  1. The device 'one shot' has

  2. A.
    two stable states
    B.
    one stable state
    C.
    either 1 or 2 stable states
    D.
    no stable state

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  3. For the logic circuit of the given figure the simplified Boolean expression is

  4. A.
    A + BC
    B.
    A + BC
    C.
    A + B C
    D.
    A + BC

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  5. If number of information bits is 4, the parity bits in Hamming code are located at bit positions __________ from the LSB.

  6. A.
    1, 2, 5
    B.
    1, 2, 4
    C.
    1, 2, 3
    D.
    1, 2

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  7. A certain JK FF has tpd = 12 n sec the largest MOD counter that can be constructed from these FF and still operate up to 10 MHz is

  8. A.
    any
    B.
    8
    C.
    256
    D.
    10

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  9. Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function.

  10. A.
    XYZ
    B.
    X Y Z
    C.
    X YZ + XY Z
    D.
    XY + YZ + ZX

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  11. If A = 0101, then A' is

  12. A.
    1010
    B.
    1011
    C.
    1001
    D.
    0110

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  13. 11011 in gray code = __________ .

  14. A.
    100102
    B.
    111112
    C.
    111002
    D.
    100012

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  15. The complement of exclusive OR function is

  16. A.
    AB + A B
    B.
    AB + A B
    C.
    A B + A
    D.
    AB + A B

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  17. Decimal -90 equals __________ in 8 bit 2s complement

  18. A.
    1000 1000
    B.
    1010 0110
    C.
    1100 1100
    D.
    0101 0101

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  19. 23.610 = __________ 2

  20. A.
    11111.1001
    B.
    10111.1001
    C.
    00111.101
    D.
    10111.1

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