Flip-Flops/Counters MCQs

Question 1

A gated S-R flip-flop goes into the CLEAR condition when ________.

Accepted Answer

S is LOW; R is HIGH; EN is HIGH

Answer

S is HIGH; R is LOW; EN is HIGH

Answer

S is LOW; R is HIGH; EN is LOW

Answer

S is HIGH; R is LOW; EN is LOW

Question 2

What type of multivibrator is a latch?

Accepted Answer

Bistable

Answer

Astable

Answer

Monostable

Answer

It depends on the type of latch.

Question 3

If an input is activated by a signal transition, it is ________.

Accepted Answer

edge-triggered

Answer

hair-triggered

Answer

line-triggered

Answer

pulse-triggered

Question 4

The inputs on a 7474 D flip-flop are S, R, D, and CLK ________ is/are synchronous.

Accepted Answer

All of the above.

Answer

Only S

Answer

S and R

Answer

Only D

Question 5

The asynchronous inputs on a J-K flip-flop ________.

Accepted Answer

all of the above

Answer

are normally not at the active level at the same time

Answer

take precedence over the J and K inputs

Answer

do not require a clock pulse to affect the output

Question 6

A positive edge-triggered flip-flop will accept inputs only when the clock ________.

Accepted Answer

changes from LOW to HIGH

Answer

is LOW

Answer

changes from HIGH to LOW

Answer

is HIGH

Question 7

If data is brought into the J terminal and its complement to the K terminal, a J-K flip-flop operates as a(n) ________.

Accepted Answer

D flip-flop

Answer

S-C flip-flop

Answer

gated S-C flip-flop

Answer

TOGGLE flip-flop

Question 8

The action of ________ a FF or latch is also called resetting.

Accepted Answer

clearing

Answer

breaking

Answer

freeing

Answer

changing

Question 9

The postponed symbol (-.) on the output of a flip-flop identifies it as being ________.

Accepted Answer

pulse triggered

Answer

a D flip-flop

Answer

a J-K flip-flop

Answer

trailing edge-triggered