Computer System Architecture - Digital Logic Circuits - Combinational Circuits

Avatto>>UGC NET COMPUTER SCIENCE>>PRACTICE QUESTIONS>>Computer System Architecture>>Digital Logic Circuits - Combinational Circuits

47. The circuit shown in the figure is equivalent to? The circuit shown in the figure is equivalent to

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49. If A ⊕ B = C, then

  • Option : D
  • Explanation : Mathematically, XOR is both associative and commutative ie. If C = A XOR B then B = C XOR A or B = A XOR C and and A = B XOR C A = C XOR B
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50. To make the following circuit a tautology ? marked box should be To make the following circuit a tautology ? marked box should be

  • Option : C
  • Explanation : The output f = (x+x')+(y+y'). Starting derivation using 'f'. -->(x+x')+(y+y') -->(x+y)+(x'+y') -->(Already a known Input)+(x'+y') So, the unknown input is (x'+y'). This can be made by :- x and y fed into a NOT gate and then AND gate to become (x'+y'). So the answer is NAND gate.
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