Advanced Microprocessors

Advanced Microprocessors

Easy Questions

Microprocessor

8085 Microprocessors
Advanced Microprocessors
  1. Among the following the slowest ADC is—








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    Integrating type ADC are more accurate but slow.

    Correct Option: C

    Integrating type ADC are more accurate but slow.

  1. The number of comparator carried out in a 4 bit flashtype A/D converter is—








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    No. of comparator required = 2n – 1
    (where, n = no. of bits)
    = 24 – 1 = 15
    Hence alternative (B) is the correct answer.

    Correct Option: B

    No. of comparator required = 2n – 1
    (where, n = no. of bits)
    = 24 – 1 = 15
    Hence alternative (B) is the correct answer.

  1. A 10 bit A/D convertor is used to digitize an analog signal in the 0 to 5 V range. The maximum peak to peak ripple voltage that can be allowed in the d.c. supply voltage is—








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    Smallest incremental change =
    1
    		 =
    1
    2101024

    For 5V,
    5
    		 = nearly 5 mV
    1024

    Hence alternative (D) is the correct answer.

    Correct Option: D

    Smallest incremental change =
    1
    		 =
    1
    2101024

    For 5V,
    5
    		 = nearly 5 mV
    1024

    Hence alternative (D) is the correct answer.

  1. How many NAND gates are required to make AB + BA?








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    Y = AB + AB
    This means, half adder requires 4 NAND gates. Hence alternative (C) is the correct answer.

    Correct Option: C


    Y = AB + AB
    This means, half adder requires 4 NAND gates. Hence alternative (C) is the correct answer.

  1. Write output—








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    F1 = (AB)′
    F2 = (BA)′
    Y = F1F2 = [( AB)′ ( BA)′]′
    = [(A + B′) ( B + A)] ′ = AB + BA
    Alternative Method:
    NAND-NAND circuit can be replaced by AND-OR Hence,

    Now, F1 = AB,
    F2 = BA
    Y=F1 + F2 = AB + BA (this is shortcut method).

    Correct Option: D


    F1 = (AB)′
    F2 = (BA)′
    Y = F1F2 = [( AB)′ ( BA)′]′
    = [(A + B′) ( B + A)] ′ = AB + BA
    Alternative Method:
    NAND-NAND circuit can be replaced by AND-OR Hence,

    Now, F1 = AB,
    F2 = BA
    Y=F1 + F2 = AB + BA (this is shortcut method).