Download Aptitude Crack
img not found img not found

Logic Gates

Q1:
A logic probe is again applied to the pins of a 7421 IC with the following results. Is there a problem with the circuit and if so, what is the problem?

A Pin 6 should be ON.

B Pin 8 should be ON.

C Pin 8 should be pulsing.

D no problem

ANS:D - no problem

Ic 7451 is a 14 pin IC, pin 7 is GND & pin 14 is Vcc. So here vcc is applied then ic is in on state & now the 2 and gates have 1, 2, 4, 5 as inputs &6 as output pin & another gate has 13, 12, 10, 9 as inputs and 8 as output.

Here given that;

1-on, 2-changing, 4, 5 -on, so output pin 6 depends on only input 2.

10th pin is in the off state so we can get 8 pin always off, by this we can say that there is no need to change the conditions all are correct.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.