Basics of OR gate and its application in industrial control

For the gate shown, inputs A & B are applied which produce an output as shown in Option:

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Which of the following logic circuit represents the situation: The output Y will go HIGH whenever conditions A & B exist simultaneously or whenever conditions C & D exist simultaneously.

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The output goes LOW only when all inputs are LOW is the interpretation of which of the following gate symbols?

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An OR gate with inverted inputs is ___________gate.
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The Boolean expression for the switch analogy shown below is:
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