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ECE :: Digital Electronics

  1. A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are

  2. A.
    0101 and 5
    B.
    0101 and 10
    C.
    1010 and 5
    D.
    1010 and 10

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  3. Assertion (A): A demultiplexer cannot be used as a decoder

    Reason (R): A multiplexer selects one of many outputs whereas a decoder selects on output corresponding to coded input.

  4. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  5. Hexadecimal number F is called to octal number

  6. A.
    15
    B.
    16
    C.
    17
    D.
    18

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  7. A half adder can be used only for adding

  8. A.
    1 s
    B.
    2 s
    C.
    4 s
    D.
    8 s

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  9. In the 8421 BCD code, the decimal number 125, is written as

  10. A.
    1111101
    B.
    0001 0010 0101
    C.
    7 D
    D.
    none of these

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  11. 110.112 x 1102 = __________ 10

  12. A.
    40.5
    B.
    30.5
    C.
    20.5
    D.
    10.5

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  13. Y = A + A B is the same as

  14. A.
    Y = AB
    B.
    Y = A + B
    C.
    Y = A + B
    D.
    Y = A + B

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  15. Assertion (A): Different symbols are used for different gates

    Reason (R): IEEE symbols are the same as traditional symbols for gates.

  16. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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