Logic Gates MCQs

Question 1

The output of an OR gate with three inputs, A, B, and C, is LOW when ________.

Accepted Answer

A = 0, B = 0, C = 0

Answer

A = 0, B = 0, C = 1

Answer

A = 0, B = 1, C = 1

Answer

all of the above

Question 2

Which of the following logical operations is represented by the + sign in Boolean algebra?

Accepted Answer

OR

Answer

inversion

Answer

AND

Answer

complementation

Question 3

Output will be a LOW for any case when one or more inputs are zero for a(n):

Accepted Answer

NOT gate

Answer

OR gate

Answer

NOR gate

Question 4

How many pins does the 4049 IC have?

Accepted Answer

16

Answer

14

Answer

18

Answer

20

Question 5

Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?

Accepted Answer

basic gates, a clock oscillator, and a repetitive waveform generator

Answer

basic gates, a clock oscillator, and a Johnson shift counter

Answer

basic gates, a clock oscillator, and a DeMorgan pulse generator

Answer

basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter

Question 6

TTL operates from a ________.

Accepted Answer

12-volt supply

Answer

9-volt supply

Answer

3-volt supply

Question 7

The output of a NOR gate is HIGH if ________.

Accepted Answer

all inputs are LOW

Answer

all inputs are HIGH

Answer

any input is HIGH

Answer

any input is LOW

Question 8

The switching speed of CMOS is now ________.

Accepted Answer

competitive with TTL

Answer

three times that of TTL

Answer

slower than TTL

Answer

twice that of TTL

Question 9

The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

Accepted Answer

truth table

Answer

Boolean constant

Answer

Boolean variable

Answer

input logic function