Advanced Microprocessors

Advanced Microprocessors

Easy Questions

Microprocessor

8085 Microprocessors
Advanced Microprocessors
  1. The combinational logic circuit shown in given figure has an output Q which is—








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    Output of MUX, Q = A BC + AB + AB + AB
    Multiply by (C + C) the term which contain no C term:
    ∴     C + C=1
    Q = A BC + AB (C + C) + AB (C + C) + ABC (C + C)
    or  Q = A BC + ABC + ABC + ABC + AB C + ABC + AB C
    This can be simplified by K-map, from K-map
    Q = A + B + C

    Hence alternative (B) is the correct answer.

    Alternative Method:

    Output of Mux, Q = A BC + AB + AB + AB
    or
    Q = A (BC + B) + A (B+ B)
    or
    Q = A (B + C) + A {∵ BC + B = B + C}
    or
    Q = AB + AC + A {∵B + B = 1}
    or
    Q = AB + A +AC {∵ AB + A = A + B}
    or
    Q = A + B + AC
    or
    Q = AC + A + B
    or
    Q = A + C + B {∵ AC + A = A + C}
    or
    Q = A + B + C

    Correct Option: B

    Output of MUX, Q = A BC + AB + AB + AB
    Multiply by (C + C) the term which contain no C term:
    ∴     C + C=1
    Q = A BC + AB (C + C) + AB (C + C) + ABC (C + C)
    or  Q = A BC + ABC + ABC + ABC + AB C + ABC + AB C
    This can be simplified by K-map, from K-map
    Q = A + B + C

    Hence alternative (B) is the correct answer.

    Alternative Method:

    Output of Mux, Q = A BC + AB + AB + AB
    or
    Q = A (BC + B) + A (B+ B)
    or
    Q = A (B + C) + A {∵ BC + B = B + C}
    or
    Q = AB + AC + A {∵B + B = 1}
    or
    Q = AB + A +AC {∵ AB + A = A + B}
    or
    Q = A + B + AC
    or
    Q = AC + A + B
    or
    Q = A + C + B {∵ AC + A = A + C}
    or
    Q = A + B + C

  1. The period of the output wave form for the circuit of figure shown, when triggered by a negative pulse is—








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    This circuit work as monostable multivibrator Time period = T= 1·1 RC (seconds)
    = 1·1 × 7·5 × 103 × 0·1 × 10–6 = 0·825 ms

    Correct Option: B

    This circuit work as monostable multivibrator Time period = T= 1·1 RC (seconds)
    = 1·1 × 7·5 × 103 × 0·1 × 10–6 = 0·825 ms

  1. The number of Boolean function that can be generated by n variables is equal to—








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    22n are the number of Boolean function that can be generated by variable. For example if n = 2 ⇒ 222 = 24 = 16 function.

    Correct Option: B

    22n are the number of Boolean function that can be generated by variable. For example if n = 2 ⇒ 222 = 24 = 16 function.

  1. Given that for a logic family—
    VOH is minimum output high level voltage
    VOL is maximum output low level voltage
    VIH is minimum acceptable input high level voltage
    VIL is maximum acceptable input low level voltage
    The correct relationship is—








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    From figure of Noise margin, we conclude that the correct order is

    VOH > VIH > VIL > VOL Hence alternative (B) is the correct.

    Correct Option: B

    From figure of Noise margin, we conclude that the correct order is

    VOH > VIH > VIL > VOL Hence alternative (B) is the correct.

  1. The circuit given below is—








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    NA

    Correct Option: C

    NA