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ECE :: Digital Electronics

  1. The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is

  2. A.
    -ve and is in normal form
    B.
    -ve and 2's complement form
    C.
    +ve and is in normal form
    D.
    +ve and in 2's complement

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  3. The decimal equivalent of the binary number 10110.0101011101 is

  4. A.
    22.2408216500
    B.
    22.3408216750
    C.
    22.3408213125
    D.
    22.3408203125

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  5. The initial contents of the 4 bit serial in parallel out right shift, shift register shown in figure is 0110. After three clock pulses are applied, the contents of the shift register will be

  6. A.
    0000
    B.
    0101
    C.
    1010
    D.
    1111

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  7. In standard TTL the totem pole stage refers to

  8. A.
    multiemitter input stage
    B.
    phase splitter
    C.
    output buffer
    D.
    open collector output stage

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  9. In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in

  10. A.
    the carry status flag
    B.
    the auxiliary carry status flag
    C.
    sign status flag
    D.
    zero status flag

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  11. Which of the following correctly declares a pointer to an array of intergers in C?

  12. A.
    int * P [20]
    B.
    int * P
    C.
    int (* P) [20]
    D.
    int * (P [20])

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  13. With 2's complement representation, the range of values that can be represented on the data bus of an 8 bit microprocessor is given by

  14. A.
    -128 to 127
    B.
    -128 to +128
    C.
    -127 to 128
    D.
    -256 to 256

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  15. In a modem digital computer, a subtractor in normally not used because

  16. A.
    subtractors are very expensive
    B.
    the design of a subtractor is very complex
    C.
    the adder is geared for doing subtraction
    D.
    most of the programs do not require subtraction

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  17. In which one of the following types of analog to digital convertors the conversion time is practically independent of the amplitude of the analog signal?

  18. A.
    The dual slope integrating type
    B.
    Successive approximation type
    C.
    Counter ramp type
    D.
    Tracking type

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  19. In 8085 microprocessor, which of the following is not vectored interrupt?

  20. A.
    RST 5.5
    B.
    RST 6.5
    C.
    RST 7.5
    D.
    INTR

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