GATE | Gate IT 2005 | Question 10
A two-way switch has three terminals a, b and c. In ON position (logic value 1), a is connected to b, and in OFF position, a is connected to c. Two of these two-way switches S1 and S2 are connected to a bulb as shown below.
Which of the following expressions, if true, will always result in the lighting of the bulb ?
Explanation: If we draw truth table of the above circuit,it’ll be
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S1 S2 Bulb
0 0 On
0 1 Off
1 0 Off
1 1 On
= (S1⊕ S2)’
Therefore answer is C
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