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Digital Electronics - Logic Gates

Exercise : Logic Gates - General Questions
16.

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?

Pin 6 should be ON.
Pin 8 should be ON.
Pin 8 should be pulsing.
no problem
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
1
2
7
8
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The Boolean expression for a 3-input AND gate is ________.
X = AB
X = ABC
X = A + B + C
X = AB + C
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
A CMOS IC operating from a 3-volt supply will consume ________.
less power than a TTL IC
more power than a TTL IC
the same power as a TTL IC
no power at all
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
What does the small bubble on the output of the NAND gate logic symbol mean?
open collector output
tristate
The output is inverted.
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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