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Logic Gates - Technical MCQs

Q1:

A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem with the chip and if so, what is the problem?

A Pin 6 should be ON.

B Pin 6 should be pulsing.

C Pin 8 should be ON.

D no problem

ANS:B - Pin 6 should be pulsing.

Because,pulsing means it will be 0 or 1. It is a 3i/p and gate;and here 6 is the o/p of the i/p=3,4,5;here 4i/p=1;5i/p=1 and only 3 is pulsing; So the ans will be o or i;

So ans is also pulsing.