B changes state during this period, but it has no effect on the output. Again, A and B change states during this time, but have no effect on the output. Note that the occurrence of the 'spike' at 5 depends on the exact relative timing of signals A and C, and the delay timing of the device itself. No signals Hi. Draw the resulting output waveform.
None are Hi.
Draw the resulting output waveform. If the output waveform from an OR gate is the same as the waveform at one of its inputs, the other input is being held permanently Lo. The output of an OR gate will exactly equal one of its inputs if the other input is held Lo. But this will also occur if the other input is equal to the first, or if, when not equal to, it is lo. To put this another way, let us name the signals.