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ECE :: Digital Electronics

  1. The logic operation that will selectively clear bits in register A in those positions where these are 1 's in the bits of register B is given by

  2. A.
    A ← A + B
    B.
    A ← AB
    C.
    A ← A + B
    D.
    A ← AB

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  3. The 2's complement representation of the decimal number -4 is

  4. A.
    0100
    B.
    1100
    C.
    1011
    D.
    1010

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  5. The following program starts at location 0100H
    L X ISP, 00FF - the content if accumulator
    LXIH, 0701 - when the program counter
    MVI A, 20 H - reaches 0109 H is
    S ∪ BM

  6. A.
    20 H
    B.
    02 H
    C.
    00 H
    D.
    FFH

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  7. In 8085 microprocessor, what is the length of PC (program counter)?

  8. A.
    6 bits
    B.
    8 bit
    C.
    12 bits
    D.
    16 bits

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  9. 7483 is a TTL binary adder. It can add

  10. A.
    two 4-bit binary numbers
    B.
    four 6-bit binary numbers
    C.
    four 8-bit binary numbers
    D.
    any number of 4-bit numbers

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  11. A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is

  12. A.
    flash type
    B.
    counting type
    C.
    integrating type
    D.
    successive approximation type

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  13. An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected ignoring shadows, what are the RAM locations?

  14. A.
    (4000)H - (40FF)H
    B.
    (8000)H - (80FF)H
    C.
    (8000)H - (40FF)H
    D.
    Any of the above

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  15. D/A converters are generally

  16. A.
    weighted resistor network
    B.
    binary ladder network
    C.
    either (a) or (b)
    D.
    neither (a) nor (b)

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  17. Is the interrupt-enable flag?

  18. A.
    Low
    B.
    High
    C.
    Never
    D.
    None

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  19. TTL uses

  20. A.
    multi-emitter transistors
    B.
    multi-collector transistors
    C.
    multi-base transistors
    D.
    multi-emitter or multi-collector transistors

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