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moenste
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Homework Statement
(a)
The NOR gate combination in Figure 1 acts as an AND gate. Copy and complete the truth table.
(b) An aircraft door is locked by two bolts A and B each of which operates a sensor giving a logic 1 when the bolt is fully inserted. A further sensor C gives a logic 0 output when the door is shut.
A circuit using logic gates is required to give logic output 1 only when both bolts are inserted and the door is shut.
By completing a copy of its truth table, show that the circuit of Figure 2 meets this requirement.
(c) Draw a circuit using two-input NOR gates only that performs the same logic function.
2. The attempt at a solution
(a) The truth table:
(b) I don't quite understand what is required. This is the truth table:
(c) I don't quite understand this part either. This is the graph:
and its truth table:
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What is correct / wrong? I am not sure on (b) and (c) parts, but would also like to know whether (a) is correct or not.