An exclusive-OR gate will invert a signal on one input if the other input is......?

Question

a) connected to the same signal

b) grounded

c) always HIGH

d) inverted?

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How many three-input NOR gates are in a 14-pin DIP integrated circuit? is it 3, 5, 4 or 2???

Answer 1

Logic is:

             A             B           Output

              0             0               0

              0             1               1

              1             0               1

              1             1               0

Therefore, if A=1, then for B=0  the output =1 and for B=1 the output=0.

The answer to the first question is c.

On a 14 pin DIP, 2 pins are used for the voltage source and ground.  That leaves 12 pins available for the 3 input NOR gates and 12/3 = 4.  

The answer to the second question is 4.

Answer 2

An XOR gate will invert a signal if the other input is always high.

There are three gates on three input NOR gate device.