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Q#1
Combinational Circuits
GATE EC 2025
MCQ
+1 mark
-0.33 marks
A full adder and an XOR gate are used to design a digital circuit with inputs 
, and 
, and output 
, as shown below. The input is connected to the carry-in input of the full adder.
If the input is set to logic ' 
', then the circuit functions as _________ with 
and 
as inputs.
an adder
a subtractor
a multiplier
a binary to Gray code converter
Explanation:
When one input of XOR Gate is 1 then output is complement of other input.
→ 2’s Complement
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