Logic Gates MCQs

Question 1

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

Accepted Answer

7

Answer

1

Answer

2

Answer

8

Question 2

Fan-out is specified in terms of ________.

Accepted Answer

unit loads

Answer

voltage

Answer

current

Answer

wattage

Question 3

How many input combinations would a truth table have for a six-input AND gate?

Accepted Answer

64

Answer

32

Answer

48

Answer

128

Question 4

What is the circuit number of the IC that contains four two-input AND gates in standard TTL?

Accepted Answer

7408

Answer

7402

Answer

7404

Answer

7432

Question 5

The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.

Accepted Answer

propagation delay time

Answer

rise time

Answer

fall time

Answer

clock speed

Question 6

The NOR logic gate is the same as the operation of the ________ gate with an inverter connected to the output.

Accepted Answer

OR

Answer

AND

Answer

NAND

Answer

none of the above

Question 7

With regard to an AND gate, which statement is true?

Accepted Answer

If one input to a 2-input AND gate is HIGH, the output reflects the other input.

Answer

An AND gate has two inputs and one output.

Answer

An AND gate has two or more inputs and two outputs.

Answer

A 2-input AND gate has eight input possibilities.

Question 8

The term "hex inverter" refers to:

Accepted Answer

six inverters in a single package

Answer

an inverter that has six inputs

Answer

a six-input symbolic logic device

Answer

an inverter that has a history of failure

Question 9

How many inputs are on the logic gates of a 74HC21 IC?

Accepted Answer

4

Answer

1

Answer

2

Answer

3