Logic Gates MCQs

Question 1

The power dissipation, PD, of a logic gate is the product of the ________.

Accepted Answer

dc supply voltage and the average supply current

Answer

dc supply voltage and the peak current

Answer

ac supply voltage and the peak current

Answer

ac supply voltage and the average supply curren

Question 2

If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

Accepted Answer

1

Answer

2

Answer

7

Answer

8

Question 3

The Boolean expression for a 3-input AND gate is ________.

Accepted Answer

X = AB

Answer

X = A + B + C

Answer

X = AB + C

Question 4

A CMOS IC operating from a 3-volt supply will consume ________.

Accepted Answer

less power than a TTL IC

Answer

more power than a TTL IC

Answer

the same power as a TTL IC

Answer

no power at all

Question 5

What does the small bubble on the output of the NAND gate logic symbol mean?

Accepted Answer

The output is inverted.

Answer

open collector output

Answer

tristate

Answer

none of the above

Question 6

What are the pin numbers of the outputs of the gates in a 7432 IC?

Accepted Answer

3, 6, 8, and 11

Answer

3, 6, 10, and 13

Answer

1, 4, 10, and 13

Answer

1, 4, 8, and 11

Question 7

The output of a NOT gate is HIGH when ________.

Accepted Answer

the input is LOW

Answer

the input is HIGH

Answer

power is applied to the gate's IC

Answer

power is removed from the gate's IC

Question 8

How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

Accepted Answer

all four inputs

Answer

any one of the inputs

Answer

any two of the inputs

Answer

any three of the inputs

Question 9

If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?

Accepted Answer

At least one input must be LOW.

Answer

All inputs must be LOW.

Answer

All inputs must be HIGH.

Answer

At least one input must be HIGH.