Combinational Circuits

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Question 1

In the following truth table, V = 1 if and only if the input is valid.
gatecs20133

What function does the truth table represent?

  • Priority encoder

  • Decoder

  • Multiplexer

  • Demultiplexer

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Question 2

What is the Boolean expression for the output f of the combinational logic circuit of NOR gates given below? CSE_201031

  • (Q+R)'

  • (P+Q)'

  • (P+R)

  • (P+Q+R)'

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Question 3

Match the following: 10

  • (1)
  • (2)
  • (3)
  • (4)
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Question 4

An N-bit carry look ahead adder, where N is a multiple of 4, employs ICs 74181 (4 bit ALU) and 74182 (4 bit carry look ahead generator). The minimum addition time using the best architecture for this adder is
  • proportional to N
  • proportional to logN
  • a constant
  • none of the above
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Question 5

A ROM is used to store the table for multiplication of two 8-bit unsigned integers. The size of ROM required is  
  • 256 x 16
  • 64K x 8
  • 4K x 16
  • 64K x 16
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Question 6

Consider the circuit given below which has a four bit binary number b3b2b1b0 as input and a five bit binary number d4d3d2d1d0 as output. The circuit implements: b_adder111               .

  • Binary to Hex conversion
  • Binary to BCD conversion
  • Binary to grey code conversion
  • Binary to radix-12 conversion
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Question 7

Consider the circuit in below figure. f implements

  • (ABC)' + A'BC' + ABC

  • A + B + C

  • A ⊕ B ⊕ C

  • AB + BC + CA

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Question 8

A logic network has two data inputs A and B, and two control inputs C0 and C1. It implements the function F according to the following table. logiic         . Implement the circuit using one 4 to 1 Multiplexer, one 2-input Exclusive OR gate, one 2-input AND gate, one 2-input OR gate and one Inverter.

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    Question 9

    The output of the following combinational circuit is F. q10 The value of F is:

    • P1+P\'2P3

    • P1+P\'2P\'3

    • P1+P2P\'3

    • P\'1+P2P3

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    Question 10

    The output of the following combinational circuit is F. q10 (1) The value of F is :

    • P1+P'2P3

    • P1+P'2P'3

    • P1+P2P'3

    • P'1+P2P3

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