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(i) Identify the logic gates marked P an...

(i) Identify the logic gates marked P and Q in the given logic circuit Fig.

(ii) Write down the output at X for the inputs `A=0, B=0` and `A=1, B=1`.

Text Solution

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Logic gate P is NOT gate and logic gate Q is OR gate.
The Boolean expression for this gate is
`X=barA+B`
The truth table for the given values of A and B of the above circuit is shown below.
`|{:(A,barA,B,y=barA+B),(0,1,0,1),(1,0,1,1):}|`
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(i) Identify the logic gates marked P and Q in the given logic circuit. (ii) Write down the output at X for the inputs A = 0 , B = 0 and A = 1 , B = 1.

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Knowledge Check

  • for the logic circuit give below , the outputs Y for A=0,B=0 and A=1,B=1 are-

    A
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    B
    0 and 0
    C
    1 and 0
    D
    1 and 1

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