1. The problem statement, all variables and given/known data (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: --- 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.