GATE EC 2015 Set 2 — Question 24
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Digital Circuits → Combinational Logic → Boolean Algebra & Identities
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Question
In the figure shown, the output is required to be . The gates G1 and G2 must be, respectively,
Correct answer
(A) NOR, OR
Solution
1.To obtain the term from inputs and with bubbles (inverters) at the gate inputs, G1 must be a NOR gate. Output of bubbled-input NOR is .
2.The bottom gate is a NOR gate (or equivalent) to produce .
3.To combine these terms as , gate G2 must be an OR gate.
Therefore, G1 is NOR and G2 is OR.Continue learning with Success Tracker
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